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kernel/sys.c
61.8 KB
b24413180 License cleanup: ... |
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// SPDX-License-Identifier: GPL-2.0 |
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/* * linux/kernel/sys.c * * Copyright (C) 1991, 1992 Linus Torvalds */ |
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#include <linux/export.h> |
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#include <linux/mm.h> #include <linux/utsname.h> #include <linux/mman.h> |
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#include <linux/reboot.h> #include <linux/prctl.h> |
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#include <linux/highuid.h> #include <linux/fs.h> |
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#include <linux/kmod.h> |
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#include <linux/perf_event.h> |
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#include <linux/resource.h> |
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#include <linux/kernel.h> |
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#include <linux/workqueue.h> |
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#include <linux/capability.h> |
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#include <linux/device.h> #include <linux/key.h> #include <linux/times.h> #include <linux/posix-timers.h> #include <linux/security.h> #include <linux/dcookies.h> #include <linux/suspend.h> #include <linux/tty.h> |
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#include <linux/signal.h> |
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#include <linux/cn_proc.h> |
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#include <linux/getcpu.h> |
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#include <linux/task_io_accounting_ops.h> |
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#include <linux/seccomp.h> |
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#include <linux/cpu.h> |
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#include <linux/personality.h> |
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#include <linux/ptrace.h> |
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#include <linux/fs_struct.h> |
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#include <linux/file.h> #include <linux/mount.h> |
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#include <linux/gfp.h> |
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#include <linux/syscore_ops.h> |
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#include <linux/version.h> #include <linux/ctype.h> |
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#include <linux/compat.h> #include <linux/syscalls.h> |
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#include <linux/kprobes.h> |
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#include <linux/user_namespace.h> |
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#include <linux/binfmts.h> |
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|
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#include <linux/sched.h> |
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#include <linux/sched/autogroup.h> |
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#include <linux/sched/loadavg.h> |
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#include <linux/sched/stat.h> |
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#include <linux/sched/mm.h> |
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#include <linux/sched/coredump.h> |
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#include <linux/sched/task.h> |
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#include <linux/sched/cputime.h> |
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#include <linux/rcupdate.h> #include <linux/uidgid.h> #include <linux/cred.h> |
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#include <linux/nospec.h> |
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#include <linux/kmsg_dump.h> |
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/* Move somewhere else to avoid recompiling? */ #include <generated/utsrelease.h> |
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|
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#include <linux/uaccess.h> |
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#include <asm/io.h> #include <asm/unistd.h> |
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#include "uid16.h" |
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#ifndef SET_UNALIGN_CTL |
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# define SET_UNALIGN_CTL(a, b) (-EINVAL) |
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#endif #ifndef GET_UNALIGN_CTL |
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# define GET_UNALIGN_CTL(a, b) (-EINVAL) |
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#endif #ifndef SET_FPEMU_CTL |
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# define SET_FPEMU_CTL(a, b) (-EINVAL) |
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#endif #ifndef GET_FPEMU_CTL |
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# define GET_FPEMU_CTL(a, b) (-EINVAL) |
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#endif #ifndef SET_FPEXC_CTL |
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# define SET_FPEXC_CTL(a, b) (-EINVAL) |
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#endif #ifndef GET_FPEXC_CTL |
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# define GET_FPEXC_CTL(a, b) (-EINVAL) |
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#endif |
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#ifndef GET_ENDIAN |
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# define GET_ENDIAN(a, b) (-EINVAL) |
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#endif #ifndef SET_ENDIAN |
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# define SET_ENDIAN(a, b) (-EINVAL) |
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#endif |
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#ifndef GET_TSC_CTL # define GET_TSC_CTL(a) (-EINVAL) #endif #ifndef SET_TSC_CTL # define SET_TSC_CTL(a) (-EINVAL) #endif |
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#ifndef MPX_ENABLE_MANAGEMENT |
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# define MPX_ENABLE_MANAGEMENT() (-EINVAL) |
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#endif #ifndef MPX_DISABLE_MANAGEMENT |
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# define MPX_DISABLE_MANAGEMENT() (-EINVAL) |
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#endif |
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#ifndef GET_FP_MODE # define GET_FP_MODE(a) (-EINVAL) #endif #ifndef SET_FP_MODE # define SET_FP_MODE(a,b) (-EINVAL) #endif |
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#ifndef SVE_SET_VL # define SVE_SET_VL(a) (-EINVAL) #endif #ifndef SVE_GET_VL # define SVE_GET_VL() (-EINVAL) #endif |
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/* * this is where the system-wide overflow UID and GID are defined, for * architectures that now have 32-bit UID/GID but didn't in the past */ int overflowuid = DEFAULT_OVERFLOWUID; int overflowgid = DEFAULT_OVERFLOWGID; |
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EXPORT_SYMBOL(overflowuid); EXPORT_SYMBOL(overflowgid); |
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/* * the same as above, but for filesystems which can only store a 16-bit * UID and GID. as such, this is needed on all architectures */ int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; |
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int fs_overflowgid = DEFAULT_FS_OVERFLOWGID; |
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EXPORT_SYMBOL(fs_overflowuid); EXPORT_SYMBOL(fs_overflowgid); /* |
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* Returns true if current's euid is same as p's uid or euid, * or has CAP_SYS_NICE to p's user_ns. * * Called with rcu_read_lock, creds are safe */ static bool set_one_prio_perm(struct task_struct *p) { const struct cred *cred = current_cred(), *pcred = __task_cred(p); |
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if (uid_eq(pcred->uid, cred->euid) || uid_eq(pcred->euid, cred->euid)) |
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return true; |
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if (ns_capable(pcred->user_ns, CAP_SYS_NICE)) |
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return true; return false; } /* |
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* set the priority of a task * - the caller must hold the RCU read lock */ |
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static int set_one_prio(struct task_struct *p, int niceval, int error) { int no_nice; |
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if (!set_one_prio_perm(p)) { |
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error = -EPERM; goto out; } |
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if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
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error = -EACCES; goto out; } no_nice = security_task_setnice(p, niceval); if (no_nice) { error = no_nice; goto out; } if (error == -ESRCH) error = 0; set_user_nice(p, niceval); out: return error; } |
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SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
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{ struct task_struct *g, *p; struct user_struct *user; |
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const struct cred *cred = current_cred(); |
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int error = -EINVAL; |
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struct pid *pgrp; |
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kuid_t uid; |
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|
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if (which > PRIO_USER || which < PRIO_PROCESS) |
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goto out; /* normalize: avoid signed division (rounding problems) */ error = -ESRCH; |
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if (niceval < MIN_NICE) niceval = MIN_NICE; if (niceval > MAX_NICE) niceval = MAX_NICE; |
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|
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rcu_read_lock(); |
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read_lock(&tasklist_lock); switch (which) { |
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case PRIO_PROCESS: if (who) p = find_task_by_vpid(who); else p = current; if (p) error = set_one_prio(p, niceval, error); break; case PRIO_PGRP: if (who) pgrp = find_vpid(who); else pgrp = task_pgrp(current); do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { error = set_one_prio(p, niceval, error); } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); break; case PRIO_USER: uid = make_kuid(cred->user_ns, who); user = cred->user; if (!who) uid = cred->uid; else if (!uid_eq(uid, cred->uid)) { user = find_user(uid); if (!user) |
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goto out_unlock; /* No processes for this user */ |
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} do_each_thread(g, p) { |
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if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) |
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error = set_one_prio(p, niceval, error); } while_each_thread(g, p); if (!uid_eq(uid, cred->uid)) free_uid(user); /* For find_user() */ break; |
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} out_unlock: read_unlock(&tasklist_lock); |
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rcu_read_unlock(); |
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out: return error; } /* * Ugh. To avoid negative return values, "getpriority()" will * not return the normal nice-value, but a negated value that * has been offset by 20 (ie it returns 40..1 instead of -20..19) * to stay compatible. */ |
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SYSCALL_DEFINE2(getpriority, int, which, int, who) |
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{ struct task_struct *g, *p; struct user_struct *user; |
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const struct cred *cred = current_cred(); |
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long niceval, retval = -ESRCH; |
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struct pid *pgrp; |
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kuid_t uid; |
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|
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if (which > PRIO_USER || which < PRIO_PROCESS) |
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return -EINVAL; |
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rcu_read_lock(); |
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read_lock(&tasklist_lock); switch (which) { |
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case PRIO_PROCESS: if (who) p = find_task_by_vpid(who); else p = current; if (p) { niceval = nice_to_rlimit(task_nice(p)); if (niceval > retval) retval = niceval; } break; case PRIO_PGRP: if (who) pgrp = find_vpid(who); else pgrp = task_pgrp(current); do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { niceval = nice_to_rlimit(task_nice(p)); if (niceval > retval) retval = niceval; } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); break; case PRIO_USER: uid = make_kuid(cred->user_ns, who); user = cred->user; if (!who) uid = cred->uid; else if (!uid_eq(uid, cred->uid)) { user = find_user(uid); if (!user) goto out_unlock; /* No processes for this user */ } do_each_thread(g, p) { |
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if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) { |
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niceval = nice_to_rlimit(task_nice(p)); |
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if (niceval > retval) retval = niceval; } |
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} while_each_thread(g, p); if (!uid_eq(uid, cred->uid)) free_uid(user); /* for find_user() */ break; |
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} out_unlock: read_unlock(&tasklist_lock); |
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rcu_read_unlock(); |
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return retval; } |
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/* * Unprivileged users may change the real gid to the effective gid * or vice versa. (BSD-style) * * If you set the real gid at all, or set the effective gid to a value not * equal to the real gid, then the saved gid is set to the new effective gid. * * This makes it possible for a setgid program to completely drop its * privileges, which is often a useful assertion to make when you are doing * a security audit over a program. * * The general idea is that a program which uses just setregid() will be * 100% compatible with BSD. A program which uses just setgid() will be |
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* 100% compatible with POSIX with saved IDs. |
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* * SMP: There are not races, the GIDs are checked only by filesystem * operations (as far as semantic preservation is concerned). */ |
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#ifdef CONFIG_MULTIUSER |
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long __sys_setregid(gid_t rgid, gid_t egid) |
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{ |
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struct user_namespace *ns = current_user_ns(); |
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const struct cred *old; struct cred *new; |
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int retval; |
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kgid_t krgid, kegid; krgid = make_kgid(ns, rgid); kegid = make_kgid(ns, egid); if ((rgid != (gid_t) -1) && !gid_valid(krgid)) return -EINVAL; if ((egid != (gid_t) -1) && !gid_valid(kegid)) return -EINVAL; |
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|
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new = prepare_creds(); if (!new) return -ENOMEM; old = current_cred(); |
d84f4f992 CRED: Inaugurate ... |
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retval = -EPERM; |
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if (rgid != (gid_t) -1) { |
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if (gid_eq(old->gid, krgid) || gid_eq(old->egid, krgid) || |
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ns_capable(old->user_ns, CAP_SETGID)) |
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new->gid = krgid; |
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else |
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goto error; |
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} if (egid != (gid_t) -1) { |
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if (gid_eq(old->gid, kegid) || gid_eq(old->egid, kegid) || gid_eq(old->sgid, kegid) || |
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ns_capable(old->user_ns, CAP_SETGID)) |
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new->egid = kegid; |
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else |
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goto error; |
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} |
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|
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if (rgid != (gid_t) -1 || |
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(egid != (gid_t) -1 && !gid_eq(kegid, old->gid))) |
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new->sgid = new->egid; new->fsgid = new->egid; return commit_creds(new); error: abort_creds(new); return retval; |
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} |
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SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) { return __sys_setregid(rgid, egid); } |
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/* |
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* setgid() is implemented like SysV w/ SAVED_IDS |
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* * SMP: Same implicit races as above. */ |
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long __sys_setgid(gid_t gid) |
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{ |
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struct user_namespace *ns = current_user_ns(); |
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const struct cred *old; struct cred *new; |
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int retval; |
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kgid_t kgid; kgid = make_kgid(ns, gid); if (!gid_valid(kgid)) return -EINVAL; |
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|
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new = prepare_creds(); if (!new) return -ENOMEM; old = current_cred(); |
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retval = -EPERM; |
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if (ns_capable(old->user_ns, CAP_SETGID)) |
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new->gid = new->egid = new->sgid = new->fsgid = kgid; else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid)) new->egid = new->fsgid = kgid; |
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else |
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goto error; |
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|
d84f4f992 CRED: Inaugurate ... |
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return commit_creds(new); error: abort_creds(new); return retval; |
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} |
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|
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SYSCALL_DEFINE1(setgid, gid_t, gid) { return __sys_setgid(gid); } |
d84f4f992 CRED: Inaugurate ... |
430 431 432 433 |
/* * change the user struct in a credentials set to match the new UID */ static int set_user(struct cred *new) |
1da177e4c Linux-2.6.12-rc2 |
434 435 |
{ struct user_struct *new_user; |
078de5f70 userns: Store uid... |
436 |
new_user = alloc_uid(new->uid); |
1da177e4c Linux-2.6.12-rc2 |
437 438 |
if (!new_user) return -EAGAIN; |
72fa59970 move RLIMIT_NPROC... |
439 440 441 442 443 444 445 |
/* * We don't fail in case of NPROC limit excess here because too many * poorly written programs don't check set*uid() return code, assuming * it never fails if called by root. We may still enforce NPROC limit * for programs doing set*uid()+execve() by harmlessly deferring the * failure to the execve() stage. */ |
78d7d407b kernel core: use ... |
446 |
if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
72fa59970 move RLIMIT_NPROC... |
447 448 449 450 |
new_user != INIT_USER) current->flags |= PF_NPROC_EXCEEDED; else current->flags &= ~PF_NPROC_EXCEEDED; |
1da177e4c Linux-2.6.12-rc2 |
451 |
|
d84f4f992 CRED: Inaugurate ... |
452 453 |
free_uid(new->user); new->user = new_user; |
1da177e4c Linux-2.6.12-rc2 |
454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 |
return 0; } /* * Unprivileged users may change the real uid to the effective uid * or vice versa. (BSD-style) * * If you set the real uid at all, or set the effective uid to a value not * equal to the real uid, then the saved uid is set to the new effective uid. * * This makes it possible for a setuid program to completely drop its * privileges, which is often a useful assertion to make when you are doing * a security audit over a program. * * The general idea is that a program which uses just setreuid() will be * 100% compatible with BSD. A program which uses just setuid() will be |
ec94fc3d5 kernel/sys.c: whi... |
470 |
* 100% compatible with POSIX with saved IDs. |
1da177e4c Linux-2.6.12-rc2 |
471 |
*/ |
e530dca58 kernel: provide k... |
472 |
long __sys_setreuid(uid_t ruid, uid_t euid) |
1da177e4c Linux-2.6.12-rc2 |
473 |
{ |
a29c33f4e userns: Convert s... |
474 |
struct user_namespace *ns = current_user_ns(); |
d84f4f992 CRED: Inaugurate ... |
475 476 |
const struct cred *old; struct cred *new; |
1da177e4c Linux-2.6.12-rc2 |
477 |
int retval; |
a29c33f4e userns: Convert s... |
478 479 480 481 482 483 484 485 486 |
kuid_t kruid, keuid; kruid = make_kuid(ns, ruid); keuid = make_kuid(ns, euid); if ((ruid != (uid_t) -1) && !uid_valid(kruid)) return -EINVAL; if ((euid != (uid_t) -1) && !uid_valid(keuid)) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
487 |
|
d84f4f992 CRED: Inaugurate ... |
488 489 490 491 |
new = prepare_creds(); if (!new) return -ENOMEM; old = current_cred(); |
d84f4f992 CRED: Inaugurate ... |
492 |
retval = -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
493 |
if (ruid != (uid_t) -1) { |
a29c33f4e userns: Convert s... |
494 495 496 |
new->uid = kruid; if (!uid_eq(old->uid, kruid) && !uid_eq(old->euid, kruid) && |
c7b96acf1 userns: Kill nso... |
497 |
!ns_capable(old->user_ns, CAP_SETUID)) |
d84f4f992 CRED: Inaugurate ... |
498 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
499 500 501 |
} if (euid != (uid_t) -1) { |
a29c33f4e userns: Convert s... |
502 503 504 505 |
new->euid = keuid; if (!uid_eq(old->uid, keuid) && !uid_eq(old->euid, keuid) && !uid_eq(old->suid, keuid) && |
c7b96acf1 userns: Kill nso... |
506 |
!ns_capable(old->user_ns, CAP_SETUID)) |
d84f4f992 CRED: Inaugurate ... |
507 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
508 |
} |
a29c33f4e userns: Convert s... |
509 |
if (!uid_eq(new->uid, old->uid)) { |
54e991242 sched: don't allo... |
510 511 512 513 |
retval = set_user(new); if (retval < 0) goto error; } |
1da177e4c Linux-2.6.12-rc2 |
514 |
if (ruid != (uid_t) -1 || |
a29c33f4e userns: Convert s... |
515 |
(euid != (uid_t) -1 && !uid_eq(keuid, old->uid))) |
d84f4f992 CRED: Inaugurate ... |
516 517 |
new->suid = new->euid; new->fsuid = new->euid; |
1da177e4c Linux-2.6.12-rc2 |
518 |
|
d84f4f992 CRED: Inaugurate ... |
519 520 521 |
retval = security_task_fix_setuid(new, old, LSM_SETID_RE); if (retval < 0) goto error; |
1da177e4c Linux-2.6.12-rc2 |
522 |
|
d84f4f992 CRED: Inaugurate ... |
523 |
return commit_creds(new); |
1da177e4c Linux-2.6.12-rc2 |
524 |
|
d84f4f992 CRED: Inaugurate ... |
525 526 527 528 |
error: abort_creds(new); return retval; } |
ec94fc3d5 kernel/sys.c: whi... |
529 |
|
e530dca58 kernel: provide k... |
530 531 532 533 |
SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) { return __sys_setreuid(ruid, euid); } |
1da177e4c Linux-2.6.12-rc2 |
534 |
/* |
ec94fc3d5 kernel/sys.c: whi... |
535 536 |
* setuid() is implemented like SysV with SAVED_IDS * |
1da177e4c Linux-2.6.12-rc2 |
537 |
* Note that SAVED_ID's is deficient in that a setuid root program |
ec94fc3d5 kernel/sys.c: whi... |
538 |
* like sendmail, for example, cannot set its uid to be a normal |
1da177e4c Linux-2.6.12-rc2 |
539 540 541 542 |
* user and then switch back, because if you're root, setuid() sets * the saved uid too. If you don't like this, blame the bright people * in the POSIX committee and/or USG. Note that the BSD-style setreuid() * will allow a root program to temporarily drop privileges and be able to |
ec94fc3d5 kernel/sys.c: whi... |
543 |
* regain them by swapping the real and effective uid. |
1da177e4c Linux-2.6.12-rc2 |
544 |
*/ |
e530dca58 kernel: provide k... |
545 |
long __sys_setuid(uid_t uid) |
1da177e4c Linux-2.6.12-rc2 |
546 |
{ |
a29c33f4e userns: Convert s... |
547 |
struct user_namespace *ns = current_user_ns(); |
d84f4f992 CRED: Inaugurate ... |
548 549 |
const struct cred *old; struct cred *new; |
1da177e4c Linux-2.6.12-rc2 |
550 |
int retval; |
a29c33f4e userns: Convert s... |
551 552 553 554 555 |
kuid_t kuid; kuid = make_kuid(ns, uid); if (!uid_valid(kuid)) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
556 |
|
d84f4f992 CRED: Inaugurate ... |
557 558 559 560 |
new = prepare_creds(); if (!new) return -ENOMEM; old = current_cred(); |
d84f4f992 CRED: Inaugurate ... |
561 |
retval = -EPERM; |
c7b96acf1 userns: Kill nso... |
562 |
if (ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4e userns: Convert s... |
563 564 |
new->suid = new->uid = kuid; if (!uid_eq(kuid, old->uid)) { |
54e991242 sched: don't allo... |
565 566 567 |
retval = set_user(new); if (retval < 0) goto error; |
d84f4f992 CRED: Inaugurate ... |
568 |
} |
a29c33f4e userns: Convert s... |
569 |
} else if (!uid_eq(kuid, old->uid) && !uid_eq(kuid, new->suid)) { |
d84f4f992 CRED: Inaugurate ... |
570 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
571 |
} |
1da177e4c Linux-2.6.12-rc2 |
572 |
|
a29c33f4e userns: Convert s... |
573 |
new->fsuid = new->euid = kuid; |
d84f4f992 CRED: Inaugurate ... |
574 575 576 577 |
retval = security_task_fix_setuid(new, old, LSM_SETID_ID); if (retval < 0) goto error; |
1da177e4c Linux-2.6.12-rc2 |
578 |
|
d84f4f992 CRED: Inaugurate ... |
579 |
return commit_creds(new); |
1da177e4c Linux-2.6.12-rc2 |
580 |
|
d84f4f992 CRED: Inaugurate ... |
581 582 583 |
error: abort_creds(new); return retval; |
1da177e4c Linux-2.6.12-rc2 |
584 |
} |
e530dca58 kernel: provide k... |
585 586 587 588 |
SYSCALL_DEFINE1(setuid, uid_t, uid) { return __sys_setuid(uid); } |
1da177e4c Linux-2.6.12-rc2 |
589 590 591 592 593 |
/* * This function implements a generic ability to update ruid, euid, * and suid. This allows you to implement the 4.4 compatible seteuid(). */ |
e530dca58 kernel: provide k... |
594 |
long __sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) |
1da177e4c Linux-2.6.12-rc2 |
595 |
{ |
a29c33f4e userns: Convert s... |
596 |
struct user_namespace *ns = current_user_ns(); |
d84f4f992 CRED: Inaugurate ... |
597 598 |
const struct cred *old; struct cred *new; |
1da177e4c Linux-2.6.12-rc2 |
599 |
int retval; |
a29c33f4e userns: Convert s... |
600 601 602 603 604 605 606 607 608 609 610 611 612 613 |
kuid_t kruid, keuid, ksuid; kruid = make_kuid(ns, ruid); keuid = make_kuid(ns, euid); ksuid = make_kuid(ns, suid); if ((ruid != (uid_t) -1) && !uid_valid(kruid)) return -EINVAL; if ((euid != (uid_t) -1) && !uid_valid(keuid)) return -EINVAL; if ((suid != (uid_t) -1) && !uid_valid(ksuid)) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
614 |
|
d84f4f992 CRED: Inaugurate ... |
615 616 617 |
new = prepare_creds(); if (!new) return -ENOMEM; |
d84f4f992 CRED: Inaugurate ... |
618 |
old = current_cred(); |
1da177e4c Linux-2.6.12-rc2 |
619 |
|
d84f4f992 CRED: Inaugurate ... |
620 |
retval = -EPERM; |
c7b96acf1 userns: Kill nso... |
621 |
if (!ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4e userns: Convert s... |
622 623 |
if (ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) && !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid)) |
d84f4f992 CRED: Inaugurate ... |
624 |
goto error; |
a29c33f4e userns: Convert s... |
625 626 |
if (euid != (uid_t) -1 && !uid_eq(keuid, old->uid) && !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid)) |
d84f4f992 CRED: Inaugurate ... |
627 |
goto error; |
a29c33f4e userns: Convert s... |
628 629 |
if (suid != (uid_t) -1 && !uid_eq(ksuid, old->uid) && !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid)) |
d84f4f992 CRED: Inaugurate ... |
630 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
631 |
} |
d84f4f992 CRED: Inaugurate ... |
632 |
|
1da177e4c Linux-2.6.12-rc2 |
633 |
if (ruid != (uid_t) -1) { |
a29c33f4e userns: Convert s... |
634 635 |
new->uid = kruid; if (!uid_eq(kruid, old->uid)) { |
54e991242 sched: don't allo... |
636 637 638 639 |
retval = set_user(new); if (retval < 0) goto error; } |
1da177e4c Linux-2.6.12-rc2 |
640 |
} |
d84f4f992 CRED: Inaugurate ... |
641 |
if (euid != (uid_t) -1) |
a29c33f4e userns: Convert s... |
642 |
new->euid = keuid; |
1da177e4c Linux-2.6.12-rc2 |
643 |
if (suid != (uid_t) -1) |
a29c33f4e userns: Convert s... |
644 |
new->suid = ksuid; |
d84f4f992 CRED: Inaugurate ... |
645 |
new->fsuid = new->euid; |
1da177e4c Linux-2.6.12-rc2 |
646 |
|
d84f4f992 CRED: Inaugurate ... |
647 648 649 |
retval = security_task_fix_setuid(new, old, LSM_SETID_RES); if (retval < 0) goto error; |
1da177e4c Linux-2.6.12-rc2 |
650 |
|
d84f4f992 CRED: Inaugurate ... |
651 |
return commit_creds(new); |
1da177e4c Linux-2.6.12-rc2 |
652 |
|
d84f4f992 CRED: Inaugurate ... |
653 654 655 |
error: abort_creds(new); return retval; |
1da177e4c Linux-2.6.12-rc2 |
656 |
} |
e530dca58 kernel: provide k... |
657 658 659 660 |
SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) { return __sys_setresuid(ruid, euid, suid); } |
a29c33f4e userns: Convert s... |
661 |
SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp) |
1da177e4c Linux-2.6.12-rc2 |
662 |
{ |
86a264abe CRED: Wrap curren... |
663 |
const struct cred *cred = current_cred(); |
1da177e4c Linux-2.6.12-rc2 |
664 |
int retval; |
a29c33f4e userns: Convert s... |
665 666 667 668 669 |
uid_t ruid, euid, suid; ruid = from_kuid_munged(cred->user_ns, cred->uid); euid = from_kuid_munged(cred->user_ns, cred->euid); suid = from_kuid_munged(cred->user_ns, cred->suid); |
1da177e4c Linux-2.6.12-rc2 |
670 |
|
ec94fc3d5 kernel/sys.c: whi... |
671 672 673 674 675 676 |
retval = put_user(ruid, ruidp); if (!retval) { retval = put_user(euid, euidp); if (!retval) return put_user(suid, suidp); } |
1da177e4c Linux-2.6.12-rc2 |
677 678 679 680 681 682 |
return retval; } /* * Same as above, but for rgid, egid, sgid. */ |
e530dca58 kernel: provide k... |
683 |
long __sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid) |
1da177e4c Linux-2.6.12-rc2 |
684 |
{ |
a29c33f4e userns: Convert s... |
685 |
struct user_namespace *ns = current_user_ns(); |
d84f4f992 CRED: Inaugurate ... |
686 687 |
const struct cred *old; struct cred *new; |
1da177e4c Linux-2.6.12-rc2 |
688 |
int retval; |
a29c33f4e userns: Convert s... |
689 690 691 692 693 694 695 696 697 698 699 700 |
kgid_t krgid, kegid, ksgid; krgid = make_kgid(ns, rgid); kegid = make_kgid(ns, egid); ksgid = make_kgid(ns, sgid); if ((rgid != (gid_t) -1) && !gid_valid(krgid)) return -EINVAL; if ((egid != (gid_t) -1) && !gid_valid(kegid)) return -EINVAL; if ((sgid != (gid_t) -1) && !gid_valid(ksgid)) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
701 |
|
d84f4f992 CRED: Inaugurate ... |
702 703 704 705 |
new = prepare_creds(); if (!new) return -ENOMEM; old = current_cred(); |
d84f4f992 CRED: Inaugurate ... |
706 |
retval = -EPERM; |
c7b96acf1 userns: Kill nso... |
707 |
if (!ns_capable(old->user_ns, CAP_SETGID)) { |
a29c33f4e userns: Convert s... |
708 709 |
if (rgid != (gid_t) -1 && !gid_eq(krgid, old->gid) && !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid)) |
d84f4f992 CRED: Inaugurate ... |
710 |
goto error; |
a29c33f4e userns: Convert s... |
711 712 |
if (egid != (gid_t) -1 && !gid_eq(kegid, old->gid) && !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid)) |
d84f4f992 CRED: Inaugurate ... |
713 |
goto error; |
a29c33f4e userns: Convert s... |
714 715 |
if (sgid != (gid_t) -1 && !gid_eq(ksgid, old->gid) && !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid)) |
d84f4f992 CRED: Inaugurate ... |
716 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
717 |
} |
d84f4f992 CRED: Inaugurate ... |
718 |
|
1da177e4c Linux-2.6.12-rc2 |
719 |
if (rgid != (gid_t) -1) |
a29c33f4e userns: Convert s... |
720 |
new->gid = krgid; |
d84f4f992 CRED: Inaugurate ... |
721 |
if (egid != (gid_t) -1) |
a29c33f4e userns: Convert s... |
722 |
new->egid = kegid; |
1da177e4c Linux-2.6.12-rc2 |
723 |
if (sgid != (gid_t) -1) |
a29c33f4e userns: Convert s... |
724 |
new->sgid = ksgid; |
d84f4f992 CRED: Inaugurate ... |
725 |
new->fsgid = new->egid; |
1da177e4c Linux-2.6.12-rc2 |
726 |
|
d84f4f992 CRED: Inaugurate ... |
727 728 729 730 731 |
return commit_creds(new); error: abort_creds(new); return retval; |
1da177e4c Linux-2.6.12-rc2 |
732 |
} |
e530dca58 kernel: provide k... |
733 734 735 736 |
SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) { return __sys_setresgid(rgid, egid, sgid); } |
a29c33f4e userns: Convert s... |
737 |
SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp) |
1da177e4c Linux-2.6.12-rc2 |
738 |
{ |
86a264abe CRED: Wrap curren... |
739 |
const struct cred *cred = current_cred(); |
1da177e4c Linux-2.6.12-rc2 |
740 |
int retval; |
a29c33f4e userns: Convert s... |
741 742 743 744 745 |
gid_t rgid, egid, sgid; rgid = from_kgid_munged(cred->user_ns, cred->gid); egid = from_kgid_munged(cred->user_ns, cred->egid); sgid = from_kgid_munged(cred->user_ns, cred->sgid); |
1da177e4c Linux-2.6.12-rc2 |
746 |
|
ec94fc3d5 kernel/sys.c: whi... |
747 748 749 750 751 752 |
retval = put_user(rgid, rgidp); if (!retval) { retval = put_user(egid, egidp); if (!retval) retval = put_user(sgid, sgidp); } |
1da177e4c Linux-2.6.12-rc2 |
753 754 755 756 757 758 759 760 761 762 763 |
return retval; } /* * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This * is used for "access()" and for the NFS daemon (letting nfsd stay at * whatever uid it wants to). It normally shadows "euid", except when * explicitly set by setfsuid() or for access.. */ |
e530dca58 kernel: provide k... |
764 |
long __sys_setfsuid(uid_t uid) |
1da177e4c Linux-2.6.12-rc2 |
765 |
{ |
d84f4f992 CRED: Inaugurate ... |
766 767 768 |
const struct cred *old; struct cred *new; uid_t old_fsuid; |
a29c33f4e userns: Convert s... |
769 770 771 772 773 774 775 776 |
kuid_t kuid; old = current_cred(); old_fsuid = from_kuid_munged(old->user_ns, old->fsuid); kuid = make_kuid(old->user_ns, uid); if (!uid_valid(kuid)) return old_fsuid; |
1da177e4c Linux-2.6.12-rc2 |
777 |
|
d84f4f992 CRED: Inaugurate ... |
778 779 |
new = prepare_creds(); if (!new) |
a29c33f4e userns: Convert s... |
780 |
return old_fsuid; |
1da177e4c Linux-2.6.12-rc2 |
781 |
|
a29c33f4e userns: Convert s... |
782 783 |
if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) || uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) || |
c7b96acf1 userns: Kill nso... |
784 |
ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4e userns: Convert s... |
785 786 |
if (!uid_eq(kuid, old->fsuid)) { new->fsuid = kuid; |
d84f4f992 CRED: Inaugurate ... |
787 788 |
if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) goto change_okay; |
1da177e4c Linux-2.6.12-rc2 |
789 |
} |
1da177e4c Linux-2.6.12-rc2 |
790 |
} |
d84f4f992 CRED: Inaugurate ... |
791 792 |
abort_creds(new); return old_fsuid; |
1da177e4c Linux-2.6.12-rc2 |
793 |
|
d84f4f992 CRED: Inaugurate ... |
794 795 |
change_okay: commit_creds(new); |
1da177e4c Linux-2.6.12-rc2 |
796 797 |
return old_fsuid; } |
e530dca58 kernel: provide k... |
798 799 800 801 |
SYSCALL_DEFINE1(setfsuid, uid_t, uid) { return __sys_setfsuid(uid); } |
1da177e4c Linux-2.6.12-rc2 |
802 |
/* |
f42df9e65 general: convert ... |
803 |
* Samma på svenska.. |
1da177e4c Linux-2.6.12-rc2 |
804 |
*/ |
e530dca58 kernel: provide k... |
805 |
long __sys_setfsgid(gid_t gid) |
1da177e4c Linux-2.6.12-rc2 |
806 |
{ |
d84f4f992 CRED: Inaugurate ... |
807 808 809 |
const struct cred *old; struct cred *new; gid_t old_fsgid; |
a29c33f4e userns: Convert s... |
810 811 812 813 814 815 816 817 |
kgid_t kgid; old = current_cred(); old_fsgid = from_kgid_munged(old->user_ns, old->fsgid); kgid = make_kgid(old->user_ns, gid); if (!gid_valid(kgid)) return old_fsgid; |
d84f4f992 CRED: Inaugurate ... |
818 819 820 |
new = prepare_creds(); if (!new) |
a29c33f4e userns: Convert s... |
821 |
return old_fsgid; |
1da177e4c Linux-2.6.12-rc2 |
822 |
|
a29c33f4e userns: Convert s... |
823 824 |
if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->egid) || gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) || |
c7b96acf1 userns: Kill nso... |
825 |
ns_capable(old->user_ns, CAP_SETGID)) { |
a29c33f4e userns: Convert s... |
826 827 |
if (!gid_eq(kgid, old->fsgid)) { new->fsgid = kgid; |
d84f4f992 CRED: Inaugurate ... |
828 |
goto change_okay; |
1da177e4c Linux-2.6.12-rc2 |
829 |
} |
1da177e4c Linux-2.6.12-rc2 |
830 |
} |
d84f4f992 CRED: Inaugurate ... |
831 |
|
d84f4f992 CRED: Inaugurate ... |
832 833 834 835 836 |
abort_creds(new); return old_fsgid; change_okay: commit_creds(new); |
1da177e4c Linux-2.6.12-rc2 |
837 838 |
return old_fsgid; } |
e530dca58 kernel: provide k... |
839 840 841 842 843 |
SYSCALL_DEFINE1(setfsgid, gid_t, gid) { return __sys_setfsgid(gid); } |
2813893f8 kernel: condition... |
844 |
#endif /* CONFIG_MULTIUSER */ |
1da177e4c Linux-2.6.12-rc2 |
845 |
|
4a22f1663 kernel/timer.c: m... |
846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 |
/** * sys_getpid - return the thread group id of the current process * * Note, despite the name, this returns the tgid not the pid. The tgid and * the pid are identical unless CLONE_THREAD was specified on clone() in * which case the tgid is the same in all threads of the same group. * * This is SMP safe as current->tgid does not change. */ SYSCALL_DEFINE0(getpid) { return task_tgid_vnr(current); } /* Thread ID - the internal kernel "pid" */ SYSCALL_DEFINE0(gettid) { return task_pid_vnr(current); } /* * Accessing ->real_parent is not SMP-safe, it could * change from under us. However, we can use a stale * value of ->real_parent under rcu_read_lock(), see * release_task()->call_rcu(delayed_put_task_struct). */ SYSCALL_DEFINE0(getppid) { int pid; rcu_read_lock(); pid = task_tgid_vnr(rcu_dereference(current->real_parent)); rcu_read_unlock(); return pid; } SYSCALL_DEFINE0(getuid) { /* Only we change this so SMP safe */ return from_kuid_munged(current_user_ns(), current_uid()); } SYSCALL_DEFINE0(geteuid) { /* Only we change this so SMP safe */ return from_kuid_munged(current_user_ns(), current_euid()); } SYSCALL_DEFINE0(getgid) { /* Only we change this so SMP safe */ return from_kgid_munged(current_user_ns(), current_gid()); } SYSCALL_DEFINE0(getegid) { /* Only we change this so SMP safe */ return from_kgid_munged(current_user_ns(), current_egid()); } |
ca2406ed5 times(2): move co... |
906 |
static void do_sys_times(struct tms *tms) |
f06febc96 timers: fix itime... |
907 |
{ |
5613fda9a sched/cputime: Co... |
908 |
u64 tgutime, tgstime, cutime, cstime; |
f06febc96 timers: fix itime... |
909 |
|
e80d0a1ae cputime: Rename t... |
910 |
thread_group_cputime_adjusted(current, &tgutime, &tgstime); |
f06febc96 timers: fix itime... |
911 912 |
cutime = current->signal->cutime; cstime = current->signal->cstime; |
5613fda9a sched/cputime: Co... |
913 914 915 916 |
tms->tms_utime = nsec_to_clock_t(tgutime); tms->tms_stime = nsec_to_clock_t(tgstime); tms->tms_cutime = nsec_to_clock_t(cutime); tms->tms_cstime = nsec_to_clock_t(cstime); |
f06febc96 timers: fix itime... |
917 |
} |
58fd3aa28 [CVE-2009-0029] S... |
918 |
SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4c Linux-2.6.12-rc2 |
919 |
{ |
1da177e4c Linux-2.6.12-rc2 |
920 921 |
if (tbuf) { struct tms tmp; |
f06febc96 timers: fix itime... |
922 923 |
do_sys_times(&tmp); |
1da177e4c Linux-2.6.12-rc2 |
924 925 926 |
if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) return -EFAULT; } |
e3d5a27d5 Allow times and t... |
927 |
force_successful_syscall_return(); |
1da177e4c Linux-2.6.12-rc2 |
928 929 |
return (long) jiffies_64_to_clock_t(get_jiffies_64()); } |
ca2406ed5 times(2): move co... |
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 |
#ifdef CONFIG_COMPAT static compat_clock_t clock_t_to_compat_clock_t(clock_t x) { return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); } COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) { if (tbuf) { struct tms tms; struct compat_tms tmp; do_sys_times(&tms); /* Convert our struct tms to the compat version. */ tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); if (copy_to_user(tbuf, &tmp, sizeof(tmp))) return -EFAULT; } force_successful_syscall_return(); return compat_jiffies_to_clock_t(jiffies); } #endif |
1da177e4c Linux-2.6.12-rc2 |
955 956 957 958 959 960 961 962 963 |
/* * This needs some heavy checking ... * I just haven't the stomach for it. I also don't fully * understand sessions/pgrp etc. Let somebody who does explain it. * * OK, I think I have the protection semantics right.... this is really * only important on a multi-user system anyway, to make sure one user * can't send a signal to a process owned by another. -TYT, 12/12/91 * |
98611e4e6 exec: kill task_s... |
964 |
* !PF_FORKNOEXEC check to conform completely to POSIX. |
1da177e4c Linux-2.6.12-rc2 |
965 |
*/ |
b290ebe2c [CVE-2009-0029] S... |
966 |
SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4c Linux-2.6.12-rc2 |
967 968 |
{ struct task_struct *p; |
ee0acf90d [PATCH] setpgid: ... |
969 |
struct task_struct *group_leader = current->group_leader; |
4e021306c sys_setpgid(): si... |
970 971 |
struct pid *pgrp; int err; |
1da177e4c Linux-2.6.12-rc2 |
972 973 |
if (!pid) |
b488893a3 pid namespaces: c... |
974 |
pid = task_pid_vnr(group_leader); |
1da177e4c Linux-2.6.12-rc2 |
975 976 977 978 |
if (!pgid) pgid = pid; if (pgid < 0) return -EINVAL; |
950eaaca6 pid: make setpgid... |
979 |
rcu_read_lock(); |
1da177e4c Linux-2.6.12-rc2 |
980 981 982 983 984 985 986 |
/* From this point forward we keep holding onto the tasklist lock * so that our parent does not change from under us. -DaveM */ write_lock_irq(&tasklist_lock); err = -ESRCH; |
4e021306c sys_setpgid(): si... |
987 |
p = find_task_by_vpid(pid); |
1da177e4c Linux-2.6.12-rc2 |
988 989 990 991 992 993 |
if (!p) goto out; err = -EINVAL; if (!thread_group_leader(p)) goto out; |
4e021306c sys_setpgid(): si... |
994 |
if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4c Linux-2.6.12-rc2 |
995 |
err = -EPERM; |
41487c65b [PATCH] pid: repl... |
996 |
if (task_session(p) != task_session(group_leader)) |
1da177e4c Linux-2.6.12-rc2 |
997 998 |
goto out; err = -EACCES; |
98611e4e6 exec: kill task_s... |
999 |
if (!(p->flags & PF_FORKNOEXEC)) |
1da177e4c Linux-2.6.12-rc2 |
1000 1001 1002 |
goto out; } else { err = -ESRCH; |
ee0acf90d [PATCH] setpgid: ... |
1003 |
if (p != group_leader) |
1da177e4c Linux-2.6.12-rc2 |
1004 1005 1006 1007 1008 1009 |
goto out; } err = -EPERM; if (p->signal->leader) goto out; |
4e021306c sys_setpgid(): si... |
1010 |
pgrp = task_pid(p); |
1da177e4c Linux-2.6.12-rc2 |
1011 |
if (pgid != pid) { |
b488893a3 pid namespaces: c... |
1012 |
struct task_struct *g; |
1da177e4c Linux-2.6.12-rc2 |
1013 |
|
4e021306c sys_setpgid(): si... |
1014 1015 |
pgrp = find_vpid(pgid); g = pid_task(pgrp, PIDTYPE_PGID); |
41487c65b [PATCH] pid: repl... |
1016 |
if (!g || task_session(g) != task_session(group_leader)) |
f020bc468 [PATCH] sys_setpg... |
1017 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1018 |
} |
1da177e4c Linux-2.6.12-rc2 |
1019 1020 1021 |
err = security_task_setpgid(p, pgid); if (err) goto out; |
1b0f7ffd0 pids: kill signal... |
1022 |
if (task_pgrp(p) != pgrp) |
83beaf3c6 pids: sys_setpgid... |
1023 |
change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4c Linux-2.6.12-rc2 |
1024 1025 1026 1027 1028 |
err = 0; out: /* All paths lead to here, thus we are safe. -DaveM */ write_unlock_irq(&tasklist_lock); |
950eaaca6 pid: make setpgid... |
1029 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1030 1031 |
return err; } |
192c58073 kernel: add do_ge... |
1032 |
static int do_getpgid(pid_t pid) |
1da177e4c Linux-2.6.12-rc2 |
1033 |
{ |
12a3de0a9 pids: sys_getpgid... |
1034 1035 1036 1037 1038 |
struct task_struct *p; struct pid *grp; int retval; rcu_read_lock(); |
756184b7d [PATCH] CodingSty... |
1039 |
if (!pid) |
12a3de0a9 pids: sys_getpgid... |
1040 |
grp = task_pgrp(current); |
756184b7d [PATCH] CodingSty... |
1041 |
else { |
1da177e4c Linux-2.6.12-rc2 |
1042 |
retval = -ESRCH; |
12a3de0a9 pids: sys_getpgid... |
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 |
p = find_task_by_vpid(pid); if (!p) goto out; grp = task_pgrp(p); if (!grp) goto out; retval = security_task_getpgid(p); if (retval) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1053 |
} |
12a3de0a9 pids: sys_getpgid... |
1054 1055 1056 1057 |
retval = pid_vnr(grp); out: rcu_read_unlock(); return retval; |
1da177e4c Linux-2.6.12-rc2 |
1058 |
} |
192c58073 kernel: add do_ge... |
1059 1060 1061 1062 |
SYSCALL_DEFINE1(getpgid, pid_t, pid) { return do_getpgid(pid); } |
1da177e4c Linux-2.6.12-rc2 |
1063 |
#ifdef __ARCH_WANT_SYS_GETPGRP |
dbf040d9d [CVE-2009-0029] S... |
1064 |
SYSCALL_DEFINE0(getpgrp) |
1da177e4c Linux-2.6.12-rc2 |
1065 |
{ |
192c58073 kernel: add do_ge... |
1066 |
return do_getpgid(0); |
1da177e4c Linux-2.6.12-rc2 |
1067 1068 1069 |
} #endif |
dbf040d9d [CVE-2009-0029] S... |
1070 |
SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4c Linux-2.6.12-rc2 |
1071 |
{ |
1dd768c08 pids: sys_getsid:... |
1072 1073 1074 1075 1076 |
struct task_struct *p; struct pid *sid; int retval; rcu_read_lock(); |
756184b7d [PATCH] CodingSty... |
1077 |
if (!pid) |
1dd768c08 pids: sys_getsid:... |
1078 |
sid = task_session(current); |
756184b7d [PATCH] CodingSty... |
1079 |
else { |
1da177e4c Linux-2.6.12-rc2 |
1080 |
retval = -ESRCH; |
1dd768c08 pids: sys_getsid:... |
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 |
p = find_task_by_vpid(pid); if (!p) goto out; sid = task_session(p); if (!sid) goto out; retval = security_task_getsid(p); if (retval) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1091 |
} |
1dd768c08 pids: sys_getsid:... |
1092 1093 1094 1095 |
retval = pid_vnr(sid); out: rcu_read_unlock(); return retval; |
1da177e4c Linux-2.6.12-rc2 |
1096 |
} |
81dabb464 exit.c: unexport ... |
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 |
static void set_special_pids(struct pid *pid) { struct task_struct *curr = current->group_leader; if (task_session(curr) != pid) change_pid(curr, PIDTYPE_SID, pid); if (task_pgrp(curr) != pid) change_pid(curr, PIDTYPE_PGID, pid); } |
e2aaa9f42 kernel: add ksys_... |
1107 |
int ksys_setsid(void) |
1da177e4c Linux-2.6.12-rc2 |
1108 |
{ |
e19f247a3 [PATCH] setpgid: ... |
1109 |
struct task_struct *group_leader = current->group_leader; |
e4cc0a9c8 fix setsid() for ... |
1110 1111 |
struct pid *sid = task_pid(group_leader); pid_t session = pid_vnr(sid); |
1da177e4c Linux-2.6.12-rc2 |
1112 |
int err = -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
1113 |
write_lock_irq(&tasklist_lock); |
390e2ff07 [PATCH] Make sets... |
1114 1115 1116 |
/* Fail if I am already a session leader */ if (group_leader->signal->leader) goto out; |
430c62312 start the global ... |
1117 1118 |
/* Fail if a process group id already exists that equals the * proposed session id. |
390e2ff07 [PATCH] Make sets... |
1119 |
*/ |
6806aac6d sys_setsid: remov... |
1120 |
if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4c Linux-2.6.12-rc2 |
1121 |
goto out; |
e19f247a3 [PATCH] setpgid: ... |
1122 |
group_leader->signal->leader = 1; |
81dabb464 exit.c: unexport ... |
1123 |
set_special_pids(sid); |
24ec839c4 [PATCH] tty: ->si... |
1124 |
|
9c9f4ded9 tty: Add a kref c... |
1125 |
proc_clear_tty(group_leader); |
24ec839c4 [PATCH] tty: ->si... |
1126 |
|
e4cc0a9c8 fix setsid() for ... |
1127 |
err = session; |
1da177e4c Linux-2.6.12-rc2 |
1128 1129 |
out: write_unlock_irq(&tasklist_lock); |
5091faa44 sched: Add 'autog... |
1130 |
if (err > 0) { |
0d0df599f connector: fix re... |
1131 |
proc_sid_connector(group_leader); |
5091faa44 sched: Add 'autog... |
1132 1133 |
sched_autogroup_create_attach(group_leader); } |
1da177e4c Linux-2.6.12-rc2 |
1134 1135 |
return err; } |
e2aaa9f42 kernel: add ksys_... |
1136 1137 1138 1139 |
SYSCALL_DEFINE0(setsid) { return ksys_setsid(); } |
1da177e4c Linux-2.6.12-rc2 |
1140 |
DECLARE_RWSEM(uts_sem); |
e28cbf229 improve sys_newun... |
1141 1142 |
#ifdef COMPAT_UTS_MACHINE #define override_architecture(name) \ |
46da27664 kernel/sys.c: fix... |
1143 |
(personality(current->personality) == PER_LINUX32 && \ |
e28cbf229 improve sys_newun... |
1144 1145 1146 1147 1148 |
copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ sizeof(COMPAT_UTS_MACHINE))) #else #define override_architecture(name) 0 #endif |
be27425dc Add a personality... |
1149 1150 1151 |
/* * Work around broken programs that cannot handle "Linux 3.0". * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40 |
39afb5ee4 kernel/sys.c: fix... |
1152 |
* And we map 4.x to 2.6.60+x, so 4.0 would be 2.6.60. |
be27425dc Add a personality... |
1153 |
*/ |
2702b1526 kernel/sys.c: fix... |
1154 |
static int override_release(char __user *release, size_t len) |
be27425dc Add a personality... |
1155 1156 |
{ int ret = 0; |
be27425dc Add a personality... |
1157 1158 |
if (current->personality & UNAME26) { |
2702b1526 kernel/sys.c: fix... |
1159 1160 |
const char *rest = UTS_RELEASE; char buf[65] = { 0 }; |
be27425dc Add a personality... |
1161 1162 |
int ndots = 0; unsigned v; |
2702b1526 kernel/sys.c: fix... |
1163 |
size_t copy; |
be27425dc Add a personality... |
1164 1165 1166 1167 1168 1169 1170 1171 |
while (*rest) { if (*rest == '.' && ++ndots >= 3) break; if (!isdigit(*rest) && *rest != '.') break; rest++; } |
39afb5ee4 kernel/sys.c: fix... |
1172 |
v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 60; |
31fd84b95 use clamp_t in UN... |
1173 |
copy = clamp_t(size_t, len, 1, sizeof(buf)); |
2702b1526 kernel/sys.c: fix... |
1174 1175 |
copy = scnprintf(buf, copy, "2.6.%u%s", v, rest); ret = copy_to_user(release, buf, copy + 1); |
be27425dc Add a personality... |
1176 1177 1178 |
} return ret; } |
e48fbb699 [CVE-2009-0029] S... |
1179 |
SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4c Linux-2.6.12-rc2 |
1180 |
{ |
42a0cc347 sys: don't hold u... |
1181 |
struct new_utsname tmp; |
1da177e4c Linux-2.6.12-rc2 |
1182 1183 |
down_read(&uts_sem); |
42a0cc347 sys: don't hold u... |
1184 |
memcpy(&tmp, utsname(), sizeof(tmp)); |
1da177e4c Linux-2.6.12-rc2 |
1185 |
up_read(&uts_sem); |
42a0cc347 sys: don't hold u... |
1186 1187 |
if (copy_to_user(name, &tmp, sizeof(tmp))) return -EFAULT; |
e28cbf229 improve sys_newun... |
1188 |
|
42a0cc347 sys: don't hold u... |
1189 1190 1191 1192 1193 |
if (override_release(name->release, sizeof(name->release))) return -EFAULT; if (override_architecture(name)) return -EFAULT; return 0; |
1da177e4c Linux-2.6.12-rc2 |
1194 |
} |
5cacdb4ad Add generic sys_o... |
1195 1196 1197 1198 1199 1200 |
#ifdef __ARCH_WANT_SYS_OLD_UNAME /* * Old cruft */ SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) { |
42a0cc347 sys: don't hold u... |
1201 |
struct old_utsname tmp; |
5cacdb4ad Add generic sys_o... |
1202 1203 1204 1205 1206 |
if (!name) return -EFAULT; down_read(&uts_sem); |
42a0cc347 sys: don't hold u... |
1207 |
memcpy(&tmp, utsname(), sizeof(tmp)); |
5cacdb4ad Add generic sys_o... |
1208 |
up_read(&uts_sem); |
42a0cc347 sys: don't hold u... |
1209 1210 |
if (copy_to_user(name, &tmp, sizeof(tmp))) return -EFAULT; |
5cacdb4ad Add generic sys_o... |
1211 |
|
42a0cc347 sys: don't hold u... |
1212 1213 1214 1215 1216 |
if (override_release(name->release, sizeof(name->release))) return -EFAULT; if (override_architecture(name)) return -EFAULT; return 0; |
5cacdb4ad Add generic sys_o... |
1217 1218 1219 1220 |
} SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) { |
42a0cc347 sys: don't hold u... |
1221 |
struct oldold_utsname tmp = {}; |
5cacdb4ad Add generic sys_o... |
1222 1223 1224 |
if (!name) return -EFAULT; |
5cacdb4ad Add generic sys_o... |
1225 1226 |
down_read(&uts_sem); |
42a0cc347 sys: don't hold u... |
1227 1228 1229 1230 1231 |
memcpy(&tmp.sysname, &utsname()->sysname, __OLD_UTS_LEN); memcpy(&tmp.nodename, &utsname()->nodename, __OLD_UTS_LEN); memcpy(&tmp.release, &utsname()->release, __OLD_UTS_LEN); memcpy(&tmp.version, &utsname()->version, __OLD_UTS_LEN); memcpy(&tmp.machine, &utsname()->machine, __OLD_UTS_LEN); |
5cacdb4ad Add generic sys_o... |
1232 |
up_read(&uts_sem); |
42a0cc347 sys: don't hold u... |
1233 1234 |
if (copy_to_user(name, &tmp, sizeof(tmp))) return -EFAULT; |
5cacdb4ad Add generic sys_o... |
1235 |
|
42a0cc347 sys: don't hold u... |
1236 1237 1238 1239 1240 |
if (override_architecture(name)) return -EFAULT; if (override_release(name->release, sizeof(name->release))) return -EFAULT; return 0; |
5cacdb4ad Add generic sys_o... |
1241 1242 |
} #endif |
5a8a82b1d [CVE-2009-0029] S... |
1243 |
SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4c Linux-2.6.12-rc2 |
1244 1245 1246 |
{ int errno; char tmp[__NEW_UTS_LEN]; |
bb96a6f50 userns: allow set... |
1247 |
if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4c Linux-2.6.12-rc2 |
1248 |
return -EPERM; |
fc832ad36 userns: user name... |
1249 |
|
1da177e4c Linux-2.6.12-rc2 |
1250 1251 |
if (len < 0 || len > __NEW_UTS_LEN) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1252 1253 |
errno = -EFAULT; if (!copy_from_user(tmp, name, len)) { |
42a0cc347 sys: don't hold u... |
1254 |
struct new_utsname *u; |
9679e4dd6 kernel/sys.c: imp... |
1255 |
|
42a0cc347 sys: don't hold u... |
1256 1257 |
down_write(&uts_sem); u = utsname(); |
9679e4dd6 kernel/sys.c: imp... |
1258 1259 |
memcpy(u->nodename, tmp, len); memset(u->nodename + len, 0, sizeof(u->nodename) - len); |
1da177e4c Linux-2.6.12-rc2 |
1260 |
errno = 0; |
499eea6bf sethostname/setdo... |
1261 |
uts_proc_notify(UTS_PROC_HOSTNAME); |
42a0cc347 sys: don't hold u... |
1262 |
up_write(&uts_sem); |
1da177e4c Linux-2.6.12-rc2 |
1263 |
} |
1da177e4c Linux-2.6.12-rc2 |
1264 1265 1266 1267 |
return errno; } #ifdef __ARCH_WANT_SYS_GETHOSTNAME |
5a8a82b1d [CVE-2009-0029] S... |
1268 |
SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4c Linux-2.6.12-rc2 |
1269 |
{ |
42a0cc347 sys: don't hold u... |
1270 |
int i; |
9679e4dd6 kernel/sys.c: imp... |
1271 |
struct new_utsname *u; |
42a0cc347 sys: don't hold u... |
1272 |
char tmp[__NEW_UTS_LEN + 1]; |
1da177e4c Linux-2.6.12-rc2 |
1273 1274 1275 1276 |
if (len < 0) return -EINVAL; down_read(&uts_sem); |
9679e4dd6 kernel/sys.c: imp... |
1277 1278 |
u = utsname(); i = 1 + strlen(u->nodename); |
1da177e4c Linux-2.6.12-rc2 |
1279 1280 |
if (i > len) i = len; |
42a0cc347 sys: don't hold u... |
1281 |
memcpy(tmp, u->nodename, i); |
1da177e4c Linux-2.6.12-rc2 |
1282 |
up_read(&uts_sem); |
42a0cc347 sys: don't hold u... |
1283 1284 1285 |
if (copy_to_user(name, tmp, i)) return -EFAULT; return 0; |
1da177e4c Linux-2.6.12-rc2 |
1286 1287 1288 1289 1290 1291 1292 1293 |
} #endif /* * Only setdomainname; getdomainname can be implemented by calling * uname() */ |
5a8a82b1d [CVE-2009-0029] S... |
1294 |
SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4c Linux-2.6.12-rc2 |
1295 1296 1297 |
{ int errno; char tmp[__NEW_UTS_LEN]; |
fc832ad36 userns: user name... |
1298 |
if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4c Linux-2.6.12-rc2 |
1299 1300 1301 |
return -EPERM; if (len < 0 || len > __NEW_UTS_LEN) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1302 1303 |
errno = -EFAULT; if (!copy_from_user(tmp, name, len)) { |
42a0cc347 sys: don't hold u... |
1304 |
struct new_utsname *u; |
9679e4dd6 kernel/sys.c: imp... |
1305 |
|
42a0cc347 sys: don't hold u... |
1306 1307 |
down_write(&uts_sem); u = utsname(); |
9679e4dd6 kernel/sys.c: imp... |
1308 1309 |
memcpy(u->domainname, tmp, len); memset(u->domainname + len, 0, sizeof(u->domainname) - len); |
1da177e4c Linux-2.6.12-rc2 |
1310 |
errno = 0; |
499eea6bf sethostname/setdo... |
1311 |
uts_proc_notify(UTS_PROC_DOMAINNAME); |
42a0cc347 sys: don't hold u... |
1312 |
up_write(&uts_sem); |
1da177e4c Linux-2.6.12-rc2 |
1313 |
} |
1da177e4c Linux-2.6.12-rc2 |
1314 1315 |
return errno; } |
e48fbb699 [CVE-2009-0029] S... |
1316 |
SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4c Linux-2.6.12-rc2 |
1317 |
{ |
b95183453 rlimits: switch m... |
1318 1319 1320 1321 1322 1323 1324 1325 |
struct rlimit value; int ret; ret = do_prlimit(current, resource, NULL, &value); if (!ret) ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; return ret; |
1da177e4c Linux-2.6.12-rc2 |
1326 |
} |
d9e968cb9 getrlimit()/setrl... |
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 |
#ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct compat_rlimit __user *, rlim) { struct rlimit r; struct compat_rlimit r32; if (copy_from_user(&r32, rlim, sizeof(struct compat_rlimit))) return -EFAULT; if (r32.rlim_cur == COMPAT_RLIM_INFINITY) r.rlim_cur = RLIM_INFINITY; else r.rlim_cur = r32.rlim_cur; if (r32.rlim_max == COMPAT_RLIM_INFINITY) r.rlim_max = RLIM_INFINITY; else r.rlim_max = r32.rlim_max; return do_prlimit(current, resource, &r, NULL); } COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct compat_rlimit __user *, rlim) { struct rlimit r; int ret; ret = do_prlimit(current, resource, NULL, &r); if (!ret) { |
58c7ffc07 fix a braino in c... |
1357 |
struct compat_rlimit r32; |
d9e968cb9 getrlimit()/setrl... |
1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 |
if (r.rlim_cur > COMPAT_RLIM_INFINITY) r32.rlim_cur = COMPAT_RLIM_INFINITY; else r32.rlim_cur = r.rlim_cur; if (r.rlim_max > COMPAT_RLIM_INFINITY) r32.rlim_max = COMPAT_RLIM_INFINITY; else r32.rlim_max = r.rlim_max; if (copy_to_user(rlim, &r32, sizeof(struct compat_rlimit))) return -EFAULT; } return ret; } #endif |
1da177e4c Linux-2.6.12-rc2 |
1374 1375 1376 1377 1378 |
#ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT /* * Back compatibility for getrlimit. Needed for some apps. */ |
e48fbb699 [CVE-2009-0029] S... |
1379 1380 |
SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4c Linux-2.6.12-rc2 |
1381 1382 1383 1384 |
{ struct rlimit x; if (resource >= RLIM_NLIMITS) return -EINVAL; |
23d6aef74 kernel/sys.c: fix... |
1385 |
resource = array_index_nospec(resource, RLIM_NLIMITS); |
1da177e4c Linux-2.6.12-rc2 |
1386 1387 1388 |
task_lock(current->group_leader); x = current->signal->rlim[resource]; task_unlock(current->group_leader); |
756184b7d [PATCH] CodingSty... |
1389 |
if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4c Linux-2.6.12-rc2 |
1390 |
x.rlim_cur = 0x7FFFFFFF; |
756184b7d [PATCH] CodingSty... |
1391 |
if (x.rlim_max > 0x7FFFFFFF) |
1da177e4c Linux-2.6.12-rc2 |
1392 |
x.rlim_max = 0x7FFFFFFF; |
ec94fc3d5 kernel/sys.c: whi... |
1393 |
return copy_to_user(rlim, &x, sizeof(x)) ? -EFAULT : 0; |
1da177e4c Linux-2.6.12-rc2 |
1394 |
} |
613763a1f take compat_sys_o... |
1395 1396 1397 1398 1399 1400 1401 1402 |
#ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, struct compat_rlimit __user *, rlim) { struct rlimit r; if (resource >= RLIM_NLIMITS) return -EINVAL; |
23d6aef74 kernel/sys.c: fix... |
1403 |
resource = array_index_nospec(resource, RLIM_NLIMITS); |
613763a1f take compat_sys_o... |
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 |
task_lock(current->group_leader); r = current->signal->rlim[resource]; task_unlock(current->group_leader); if (r.rlim_cur > 0x7FFFFFFF) r.rlim_cur = 0x7FFFFFFF; if (r.rlim_max > 0x7FFFFFFF) r.rlim_max = 0x7FFFFFFF; if (put_user(r.rlim_cur, &rlim->rlim_cur) || put_user(r.rlim_max, &rlim->rlim_max)) return -EFAULT; return 0; } #endif |
1da177e4c Linux-2.6.12-rc2 |
1418 |
#endif |
c022a0aca rlimits: implemen... |
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 |
static inline bool rlim64_is_infinity(__u64 rlim64) { #if BITS_PER_LONG < 64 return rlim64 >= ULONG_MAX; #else return rlim64 == RLIM64_INFINITY; #endif } static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) { if (rlim->rlim_cur == RLIM_INFINITY) rlim64->rlim_cur = RLIM64_INFINITY; else rlim64->rlim_cur = rlim->rlim_cur; if (rlim->rlim_max == RLIM_INFINITY) rlim64->rlim_max = RLIM64_INFINITY; else rlim64->rlim_max = rlim->rlim_max; } static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) { if (rlim64_is_infinity(rlim64->rlim_cur)) rlim->rlim_cur = RLIM_INFINITY; else rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; if (rlim64_is_infinity(rlim64->rlim_max)) rlim->rlim_max = RLIM_INFINITY; else rlim->rlim_max = (unsigned long)rlim64->rlim_max; } |
1c1e618dd rlimits: allow se... |
1451 |
/* make sure you are allowed to change @tsk limits before calling this */ |
5b41535aa rlimits: redo do_... |
1452 1453 |
int do_prlimit(struct task_struct *tsk, unsigned int resource, struct rlimit *new_rlim, struct rlimit *old_rlim) |
1da177e4c Linux-2.6.12-rc2 |
1454 |
{ |
5b41535aa rlimits: redo do_... |
1455 |
struct rlimit *rlim; |
86f162f4c rlimits: do secur... |
1456 |
int retval = 0; |
1da177e4c Linux-2.6.12-rc2 |
1457 1458 1459 |
if (resource >= RLIM_NLIMITS) return -EINVAL; |
5b41535aa rlimits: redo do_... |
1460 1461 1462 1463 1464 1465 1466 |
if (new_rlim) { if (new_rlim->rlim_cur > new_rlim->rlim_max) return -EINVAL; if (resource == RLIMIT_NOFILE && new_rlim->rlim_max > sysctl_nr_open) return -EPERM; } |
1da177e4c Linux-2.6.12-rc2 |
1467 |
|
1c1e618dd rlimits: allow se... |
1468 1469 1470 1471 1472 1473 |
/* protect tsk->signal and tsk->sighand from disappearing */ read_lock(&tasklist_lock); if (!tsk->sighand) { retval = -ESRCH; goto out; } |
5b41535aa rlimits: redo do_... |
1474 |
rlim = tsk->signal->rlim + resource; |
86f162f4c rlimits: do secur... |
1475 |
task_lock(tsk->group_leader); |
5b41535aa rlimits: redo do_... |
1476 |
if (new_rlim) { |
fc832ad36 userns: user name... |
1477 1478 |
/* Keep the capable check against init_user_ns until cgroups can contain all limits */ |
5b41535aa rlimits: redo do_... |
1479 1480 1481 1482 |
if (new_rlim->rlim_max > rlim->rlim_max && !capable(CAP_SYS_RESOURCE)) retval = -EPERM; if (!retval) |
cad4ea546 rlimit: Properly ... |
1483 |
retval = security_task_setrlimit(tsk, resource, new_rlim); |
5b41535aa rlimits: redo do_... |
1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 |
if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { /* * The caller is asking for an immediate RLIMIT_CPU * expiry. But we use the zero value to mean "it was * never set". So let's cheat and make it one second * instead */ new_rlim->rlim_cur = 1; } } if (!retval) { if (old_rlim) *old_rlim = *rlim; if (new_rlim) *rlim = *new_rlim; |
9926e4c74 CPU time limit pa... |
1499 |
} |
7855c35da rlimits: split sy... |
1500 |
task_unlock(tsk->group_leader); |
1da177e4c Linux-2.6.12-rc2 |
1501 |
|
d3561f78f [PATCH] RLIMIT_CP... |
1502 1503 1504 1505 1506 1507 |
/* * RLIMIT_CPU handling. Note that the kernel fails to return an error * code if it rejected the user's attempt to set RLIMIT_CPU. This is a * very long-standing error, and fixing it now risks breakage of * applications, so we live with it */ |
5b41535aa rlimits: redo do_... |
1508 |
if (!retval && new_rlim && resource == RLIMIT_CPU && |
baa73d9e4 posix-timers: Mak... |
1509 1510 |
new_rlim->rlim_cur != RLIM_INFINITY && IS_ENABLED(CONFIG_POSIX_TIMERS)) |
5b41535aa rlimits: redo do_... |
1511 |
update_rlimit_cpu(tsk, new_rlim->rlim_cur); |
ec9e16bac [PATCH] sys_setrl... |
1512 |
out: |
1c1e618dd rlimits: allow se... |
1513 |
read_unlock(&tasklist_lock); |
2fb9d2689 rlimits: make sur... |
1514 |
return retval; |
1da177e4c Linux-2.6.12-rc2 |
1515 |
} |
c022a0aca rlimits: implemen... |
1516 |
/* rcu lock must be held */ |
791ec491c prlimit,security,... |
1517 1518 |
static int check_prlimit_permission(struct task_struct *task, unsigned int flags) |
c022a0aca rlimits: implemen... |
1519 1520 |
{ const struct cred *cred = current_cred(), *tcred; |
791ec491c prlimit,security,... |
1521 |
bool id_match; |
c022a0aca rlimits: implemen... |
1522 |
|
fc832ad36 userns: user name... |
1523 1524 |
if (current == task) return 0; |
c022a0aca rlimits: implemen... |
1525 |
|
fc832ad36 userns: user name... |
1526 |
tcred = __task_cred(task); |
791ec491c prlimit,security,... |
1527 1528 1529 1530 1531 1532 1533 1534 |
id_match = (uid_eq(cred->uid, tcred->euid) && uid_eq(cred->uid, tcred->suid) && uid_eq(cred->uid, tcred->uid) && gid_eq(cred->gid, tcred->egid) && gid_eq(cred->gid, tcred->sgid) && gid_eq(cred->gid, tcred->gid)); if (!id_match && !ns_capable(tcred->user_ns, CAP_SYS_RESOURCE)) return -EPERM; |
fc832ad36 userns: user name... |
1535 |
|
791ec491c prlimit,security,... |
1536 |
return security_task_prlimit(cred, tcred, flags); |
c022a0aca rlimits: implemen... |
1537 1538 1539 1540 1541 1542 1543 1544 1545 |
} SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, const struct rlimit64 __user *, new_rlim, struct rlimit64 __user *, old_rlim) { struct rlimit64 old64, new64; struct rlimit old, new; struct task_struct *tsk; |
791ec491c prlimit,security,... |
1546 |
unsigned int checkflags = 0; |
c022a0aca rlimits: implemen... |
1547 |
int ret; |
791ec491c prlimit,security,... |
1548 1549 |
if (old_rlim) checkflags |= LSM_PRLIMIT_READ; |
c022a0aca rlimits: implemen... |
1550 1551 1552 1553 |
if (new_rlim) { if (copy_from_user(&new64, new_rlim, sizeof(new64))) return -EFAULT; rlim64_to_rlim(&new64, &new); |
791ec491c prlimit,security,... |
1554 |
checkflags |= LSM_PRLIMIT_WRITE; |
c022a0aca rlimits: implemen... |
1555 1556 1557 1558 1559 1560 1561 1562 |
} rcu_read_lock(); tsk = pid ? find_task_by_vpid(pid) : current; if (!tsk) { rcu_read_unlock(); return -ESRCH; } |
791ec491c prlimit,security,... |
1563 |
ret = check_prlimit_permission(tsk, checkflags); |
c022a0aca rlimits: implemen... |
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 |
if (ret) { rcu_read_unlock(); return ret; } get_task_struct(tsk); rcu_read_unlock(); ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, old_rlim ? &old : NULL); if (!ret && old_rlim) { rlim_to_rlim64(&old, &old64); if (copy_to_user(old_rlim, &old64, sizeof(old64))) ret = -EFAULT; } put_task_struct(tsk); return ret; } |
7855c35da rlimits: split sy... |
1583 1584 1585 1586 1587 1588 |
SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) { struct rlimit new_rlim; if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) return -EFAULT; |
5b41535aa rlimits: redo do_... |
1589 |
return do_prlimit(current, resource, &new_rlim, NULL); |
7855c35da rlimits: split sy... |
1590 |
} |
1da177e4c Linux-2.6.12-rc2 |
1591 1592 1593 1594 1595 1596 1597 1598 |
/* * It would make sense to put struct rusage in the task_struct, * except that would make the task_struct be *really big*. After * task_struct gets moved into malloc'ed memory, it would * make sense to do this. It will make moving the rest of the information * a lot simpler! (Which we're not doing right now because we're not * measuring them yet). * |
1da177e4c Linux-2.6.12-rc2 |
1599 1600 1601 1602 1603 1604 1605 |
* When sampling multiple threads for RUSAGE_SELF, under SMP we might have * races with threads incrementing their own counters. But since word * reads are atomic, we either get new values or old values and we don't * care which for the sums. We always take the siglock to protect reading * the c* fields from p->signal from races with exit.c updating those * fields when reaping, so a sample either gets all the additions of a * given child after it's reaped, or none so this sample is before reaping. |
2dd0ebcd2 [PATCH] Avoid tak... |
1606 |
* |
de047c1bc [PATCH] avoid tas... |
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 |
* Locking: * We need to take the siglock for CHILDEREN, SELF and BOTH * for the cases current multithreaded, non-current single threaded * non-current multithreaded. Thread traversal is now safe with * the siglock held. * Strictly speaking, we donot need to take the siglock if we are current and * single threaded, as no one else can take our signal_struct away, no one * else can reap the children to update signal->c* counters, and no one else * can race with the signal-> fields. If we do not take any lock, the * signal-> fields could be read out of order while another thread was just * exiting. So we should place a read memory barrier when we avoid the lock. * On the writer side, write memory barrier is implied in __exit_signal * as __exit_signal releases the siglock spinlock after updating the signal-> * fields. But we don't do this yet to keep things simple. |
2dd0ebcd2 [PATCH] Avoid tak... |
1621 |
* |
1da177e4c Linux-2.6.12-rc2 |
1622 |
*/ |
f06febc96 timers: fix itime... |
1623 |
static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4a add RUSAGE_THREAD |
1624 |
{ |
679c9cd4a add RUSAGE_THREAD |
1625 1626 1627 1628 1629 1630 1631 |
r->ru_nvcsw += t->nvcsw; r->ru_nivcsw += t->nivcsw; r->ru_minflt += t->min_flt; r->ru_majflt += t->maj_flt; r->ru_inblock += task_io_get_inblock(t); r->ru_oublock += task_io_get_oublock(t); } |
ce72a16fa wait4(2)/waitid(2... |
1632 |
void getrusage(struct task_struct *p, int who, struct rusage *r) |
1da177e4c Linux-2.6.12-rc2 |
1633 1634 1635 |
{ struct task_struct *t; unsigned long flags; |
5613fda9a sched/cputime: Co... |
1636 |
u64 tgutime, tgstime, utime, stime; |
1f10206cf getrusage: fill r... |
1637 |
unsigned long maxrss = 0; |
1da177e4c Linux-2.6.12-rc2 |
1638 |
|
ec94fc3d5 kernel/sys.c: whi... |
1639 |
memset((char *)r, 0, sizeof (*r)); |
648616343 [S390] cputime: a... |
1640 |
utime = stime = 0; |
1da177e4c Linux-2.6.12-rc2 |
1641 |
|
679c9cd4a add RUSAGE_THREAD |
1642 |
if (who == RUSAGE_THREAD) { |
e80d0a1ae cputime: Rename t... |
1643 |
task_cputime_adjusted(current, &utime, &stime); |
f06febc96 timers: fix itime... |
1644 |
accumulate_thread_rusage(p, r); |
1f10206cf getrusage: fill r... |
1645 |
maxrss = p->signal->maxrss; |
679c9cd4a add RUSAGE_THREAD |
1646 1647 |
goto out; } |
d6cf723a1 k_getrusage: don'... |
1648 |
if (!lock_task_sighand(p, &flags)) |
de047c1bc [PATCH] avoid tas... |
1649 |
return; |
0f59cc4a3 [PATCH] simplify ... |
1650 |
|
1da177e4c Linux-2.6.12-rc2 |
1651 |
switch (who) { |
ec94fc3d5 kernel/sys.c: whi... |
1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 |
case RUSAGE_BOTH: case RUSAGE_CHILDREN: utime = p->signal->cutime; stime = p->signal->cstime; r->ru_nvcsw = p->signal->cnvcsw; r->ru_nivcsw = p->signal->cnivcsw; r->ru_minflt = p->signal->cmin_flt; r->ru_majflt = p->signal->cmaj_flt; r->ru_inblock = p->signal->cinblock; r->ru_oublock = p->signal->coublock; maxrss = p->signal->cmaxrss; if (who == RUSAGE_CHILDREN) |
1da177e4c Linux-2.6.12-rc2 |
1665 |
break; |
0f59cc4a3 [PATCH] simplify ... |
1666 |
|
ec94fc3d5 kernel/sys.c: whi... |
1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 |
case RUSAGE_SELF: thread_group_cputime_adjusted(p, &tgutime, &tgstime); utime += tgutime; stime += tgstime; r->ru_nvcsw += p->signal->nvcsw; r->ru_nivcsw += p->signal->nivcsw; r->ru_minflt += p->signal->min_flt; r->ru_majflt += p->signal->maj_flt; r->ru_inblock += p->signal->inblock; r->ru_oublock += p->signal->oublock; if (maxrss < p->signal->maxrss) maxrss = p->signal->maxrss; t = p; do { accumulate_thread_rusage(t, r); } while_each_thread(p, t); break; default: BUG(); |
1da177e4c Linux-2.6.12-rc2 |
1687 |
} |
de047c1bc [PATCH] avoid tas... |
1688 |
unlock_task_sighand(p, &flags); |
de047c1bc [PATCH] avoid tas... |
1689 |
|
679c9cd4a add RUSAGE_THREAD |
1690 |
out: |
5613fda9a sched/cputime: Co... |
1691 1692 |
r->ru_utime = ns_to_timeval(utime); r->ru_stime = ns_to_timeval(stime); |
1f10206cf getrusage: fill r... |
1693 1694 1695 |
if (who != RUSAGE_CHILDREN) { struct mm_struct *mm = get_task_mm(p); |
ec94fc3d5 kernel/sys.c: whi... |
1696 |
|
1f10206cf getrusage: fill r... |
1697 1698 1699 1700 1701 1702 |
if (mm) { setmax_mm_hiwater_rss(&maxrss, mm); mmput(mm); } } r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ |
1da177e4c Linux-2.6.12-rc2 |
1703 |
} |
ce72a16fa wait4(2)/waitid(2... |
1704 |
SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4c Linux-2.6.12-rc2 |
1705 1706 |
{ struct rusage r; |
ec94fc3d5 kernel/sys.c: whi... |
1707 |
|
679c9cd4a add RUSAGE_THREAD |
1708 1709 |
if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && who != RUSAGE_THREAD) |
1da177e4c Linux-2.6.12-rc2 |
1710 |
return -EINVAL; |
ce72a16fa wait4(2)/waitid(2... |
1711 1712 1713 |
getrusage(current, who, &r); return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1da177e4c Linux-2.6.12-rc2 |
1714 |
} |
8d2d5c4a2 switch getrusage(... |
1715 1716 1717 1718 1719 1720 1721 1722 |
#ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru) { struct rusage r; if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && who != RUSAGE_THREAD) return -EINVAL; |
ce72a16fa wait4(2)/waitid(2... |
1723 |
getrusage(current, who, &r); |
8d2d5c4a2 switch getrusage(... |
1724 1725 1726 |
return put_compat_rusage(&r, ru); } #endif |
e48fbb699 [CVE-2009-0029] S... |
1727 |
SYSCALL_DEFINE1(umask, int, mask) |
1da177e4c Linux-2.6.12-rc2 |
1728 1729 1730 1731 |
{ mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); return mask; } |
3b7391de6 capabilities: int... |
1732 |
|
6e399cd14 prctl: avoid usin... |
1733 |
static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) |
b32dfe377 c/r: prctl: add a... |
1734 |
{ |
2903ff019 switch simple cas... |
1735 |
struct fd exe; |
6e399cd14 prctl: avoid usin... |
1736 |
struct file *old_exe, *exe_file; |
496ad9aa8 new helper: file_... |
1737 |
struct inode *inode; |
2903ff019 switch simple cas... |
1738 |
int err; |
b32dfe377 c/r: prctl: add a... |
1739 |
|
2903ff019 switch simple cas... |
1740 1741 |
exe = fdget(fd); if (!exe.file) |
b32dfe377 c/r: prctl: add a... |
1742 |
return -EBADF; |
496ad9aa8 new helper: file_... |
1743 |
inode = file_inode(exe.file); |
b32dfe377 c/r: prctl: add a... |
1744 1745 1746 1747 1748 1749 1750 |
/* * Because the original mm->exe_file points to executable file, make * sure that this one is executable as well, to avoid breaking an * overall picture. */ err = -EACCES; |
90f8572b0 vfs: Commit to ne... |
1751 |
if (!S_ISREG(inode->i_mode) || path_noexec(&exe.file->f_path)) |
b32dfe377 c/r: prctl: add a... |
1752 |
goto exit; |
496ad9aa8 new helper: file_... |
1753 |
err = inode_permission(inode, MAY_EXEC); |
b32dfe377 c/r: prctl: add a... |
1754 1755 |
if (err) goto exit; |
bafb282df c/r: prctl: updat... |
1756 |
/* |
4229fb1dc c/r: prctl: less ... |
1757 |
* Forbid mm->exe_file change if old file still mapped. |
bafb282df c/r: prctl: updat... |
1758 |
*/ |
6e399cd14 prctl: avoid usin... |
1759 |
exe_file = get_mm_exe_file(mm); |
bafb282df c/r: prctl: updat... |
1760 |
err = -EBUSY; |
6e399cd14 prctl: avoid usin... |
1761 |
if (exe_file) { |
4229fb1dc c/r: prctl: less ... |
1762 |
struct vm_area_struct *vma; |
6e399cd14 prctl: avoid usin... |
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 |
down_read(&mm->mmap_sem); for (vma = mm->mmap; vma; vma = vma->vm_next) { if (!vma->vm_file) continue; if (path_equal(&vma->vm_file->f_path, &exe_file->f_path)) goto exit_err; } up_read(&mm->mmap_sem); fput(exe_file); |
bafb282df c/r: prctl: updat... |
1774 |
} |
4229fb1dc c/r: prctl: less ... |
1775 |
err = 0; |
6e399cd14 prctl: avoid usin... |
1776 1777 1778 1779 1780 |
/* set the new file, lockless */ get_file(exe.file); old_exe = xchg(&mm->exe_file, exe.file); if (old_exe) fput(old_exe); |
b32dfe377 c/r: prctl: add a... |
1781 |
exit: |
2903ff019 switch simple cas... |
1782 |
fdput(exe); |
b32dfe377 c/r: prctl: add a... |
1783 |
return err; |
6e399cd14 prctl: avoid usin... |
1784 1785 1786 1787 |
exit_err: up_read(&mm->mmap_sem); fput(exe_file); goto exit; |
b32dfe377 c/r: prctl: add a... |
1788 |
} |
f606b77f1 prctl: PR_SET_MM ... |
1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 |
/* * WARNING: we don't require any capability here so be very careful * in what is allowed for modification from userspace. */ static int validate_prctl_map(struct prctl_mm_map *prctl_map) { unsigned long mmap_max_addr = TASK_SIZE; struct mm_struct *mm = current->mm; int error = -EINVAL, i; static const unsigned char offsets[] = { offsetof(struct prctl_mm_map, start_code), offsetof(struct prctl_mm_map, end_code), offsetof(struct prctl_mm_map, start_data), offsetof(struct prctl_mm_map, end_data), offsetof(struct prctl_mm_map, start_brk), offsetof(struct prctl_mm_map, brk), offsetof(struct prctl_mm_map, start_stack), offsetof(struct prctl_mm_map, arg_start), offsetof(struct prctl_mm_map, arg_end), offsetof(struct prctl_mm_map, env_start), offsetof(struct prctl_mm_map, env_end), }; /* * Make sure the members are not somewhere outside * of allowed address space. */ for (i = 0; i < ARRAY_SIZE(offsets); i++) { u64 val = *(u64 *)((char *)prctl_map + offsets[i]); if ((unsigned long)val >= mmap_max_addr || (unsigned long)val < mmap_min_addr) goto out; } /* * Make sure the pairs are ordered. */ #define __prctl_check_order(__m1, __op, __m2) \ ((unsigned long)prctl_map->__m1 __op \ (unsigned long)prctl_map->__m2) ? 0 : -EINVAL error = __prctl_check_order(start_code, <, end_code); error |= __prctl_check_order(start_data, <, end_data); error |= __prctl_check_order(start_brk, <=, brk); error |= __prctl_check_order(arg_start, <=, arg_end); error |= __prctl_check_order(env_start, <=, env_end); if (error) goto out; #undef __prctl_check_order error = -EINVAL; /* * @brk should be after @end_data in traditional maps. */ if (prctl_map->start_brk <= prctl_map->end_data || prctl_map->brk <= prctl_map->end_data) goto out; /* * Neither we should allow to override limits if they set. */ if (check_data_rlimit(rlimit(RLIMIT_DATA), prctl_map->brk, prctl_map->start_brk, prctl_map->end_data, prctl_map->start_data)) goto out; /* * Someone is trying to cheat the auxv vector. */ if (prctl_map->auxv_size) { if (!prctl_map->auxv || prctl_map->auxv_size > sizeof(mm->saved_auxv)) goto out; } /* * Finally, make sure the caller has the rights to |
4d28df615 prctl: Allow loca... |
1867 |
* change /proc/pid/exe link: only local sys admin should |
f606b77f1 prctl: PR_SET_MM ... |
1868 1869 1870 |
* be allowed to. */ if (prctl_map->exe_fd != (u32)-1) { |
4d28df615 prctl: Allow loca... |
1871 |
if (!ns_capable(current_user_ns(), CAP_SYS_ADMIN)) |
f606b77f1 prctl: PR_SET_MM ... |
1872 1873 1874 1875 1876 1877 1878 |
goto out; } error = 0; out: return error; } |
4a00e9df2 prctl: more prctl... |
1879 |
#ifdef CONFIG_CHECKPOINT_RESTORE |
f606b77f1 prctl: PR_SET_MM ... |
1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 |
static int prctl_set_mm_map(int opt, const void __user *addr, unsigned long data_size) { struct prctl_mm_map prctl_map = { .exe_fd = (u32)-1, }; unsigned long user_auxv[AT_VECTOR_SIZE]; struct mm_struct *mm = current->mm; int error; BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv)); BUILD_BUG_ON(sizeof(struct prctl_mm_map) > 256); if (opt == PR_SET_MM_MAP_SIZE) return put_user((unsigned int)sizeof(prctl_map), (unsigned int __user *)addr); if (data_size != sizeof(prctl_map)) return -EINVAL; if (copy_from_user(&prctl_map, addr, sizeof(prctl_map))) return -EFAULT; error = validate_prctl_map(&prctl_map); if (error) return error; if (prctl_map.auxv_size) { memset(user_auxv, 0, sizeof(user_auxv)); if (copy_from_user(user_auxv, (const void __user *)prctl_map.auxv, prctl_map.auxv_size)) return -EFAULT; /* Last entry must be AT_NULL as specification requires */ user_auxv[AT_VECTOR_SIZE - 2] = AT_NULL; user_auxv[AT_VECTOR_SIZE - 1] = AT_NULL; } |
ddf1d398e prctl: take mmap ... |
1915 |
if (prctl_map.exe_fd != (u32)-1) { |
6e399cd14 prctl: avoid usin... |
1916 |
error = prctl_set_mm_exe_file(mm, prctl_map.exe_fd); |
ddf1d398e prctl: take mmap ... |
1917 1918 1919 |
if (error) return error; } |
88aa7cc68 mm: introduce arg... |
1920 1921 1922 1923 1924 |
/* * arg_lock protects concurent updates but we still need mmap_sem for * read to exclude races with sys_brk. */ down_read(&mm->mmap_sem); |
f606b77f1 prctl: PR_SET_MM ... |
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 |
/* * We don't validate if these members are pointing to * real present VMAs because application may have correspond * VMAs already unmapped and kernel uses these members for statistics * output in procfs mostly, except * * - @start_brk/@brk which are used in do_brk but kernel lookups * for VMAs when updating these memvers so anything wrong written * here cause kernel to swear at userspace program but won't lead * to any problem in kernel itself */ |
88aa7cc68 mm: introduce arg... |
1937 |
spin_lock(&mm->arg_lock); |
f606b77f1 prctl: PR_SET_MM ... |
1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 |
mm->start_code = prctl_map.start_code; mm->end_code = prctl_map.end_code; mm->start_data = prctl_map.start_data; mm->end_data = prctl_map.end_data; mm->start_brk = prctl_map.start_brk; mm->brk = prctl_map.brk; mm->start_stack = prctl_map.start_stack; mm->arg_start = prctl_map.arg_start; mm->arg_end = prctl_map.arg_end; mm->env_start = prctl_map.env_start; mm->env_end = prctl_map.env_end; |
88aa7cc68 mm: introduce arg... |
1949 |
spin_unlock(&mm->arg_lock); |
f606b77f1 prctl: PR_SET_MM ... |
1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 |
/* * Note this update of @saved_auxv is lockless thus * if someone reads this member in procfs while we're * updating -- it may get partly updated results. It's * known and acceptable trade off: we leave it as is to * not introduce additional locks here making the kernel * more complex. */ if (prctl_map.auxv_size) memcpy(mm->saved_auxv, user_auxv, sizeof(user_auxv)); |
88aa7cc68 mm: introduce arg... |
1961 |
up_read(&mm->mmap_sem); |
ddf1d398e prctl: take mmap ... |
1962 |
return 0; |
f606b77f1 prctl: PR_SET_MM ... |
1963 1964 |
} #endif /* CONFIG_CHECKPOINT_RESTORE */ |
4a00e9df2 prctl: more prctl... |
1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 |
static int prctl_set_auxv(struct mm_struct *mm, unsigned long addr, unsigned long len) { /* * This doesn't move the auxiliary vector itself since it's pinned to * mm_struct, but it permits filling the vector with new values. It's * up to the caller to provide sane values here, otherwise userspace * tools which use this vector might be unhappy. */ unsigned long user_auxv[AT_VECTOR_SIZE]; if (len > sizeof(user_auxv)) return -EINVAL; if (copy_from_user(user_auxv, (const void __user *)addr, len)) return -EFAULT; /* Make sure the last entry is always AT_NULL */ user_auxv[AT_VECTOR_SIZE - 2] = 0; user_auxv[AT_VECTOR_SIZE - 1] = 0; BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv)); task_lock(current); memcpy(mm->saved_auxv, user_auxv, len); task_unlock(current); return 0; } |
028ee4be3 c/r: prctl: add P... |
1994 1995 1996 |
static int prctl_set_mm(int opt, unsigned long addr, unsigned long arg4, unsigned long arg5) { |
028ee4be3 c/r: prctl: add P... |
1997 |
struct mm_struct *mm = current->mm; |
4a00e9df2 prctl: more prctl... |
1998 |
struct prctl_mm_map prctl_map; |
fe8c7f5cb c/r: prctl: exten... |
1999 2000 |
struct vm_area_struct *vma; int error; |
028ee4be3 c/r: prctl: add P... |
2001 |
|
f606b77f1 prctl: PR_SET_MM ... |
2002 2003 2004 |
if (arg5 || (arg4 && (opt != PR_SET_MM_AUXV && opt != PR_SET_MM_MAP && opt != PR_SET_MM_MAP_SIZE))) |
028ee4be3 c/r: prctl: add P... |
2005 |
return -EINVAL; |
f606b77f1 prctl: PR_SET_MM ... |
2006 2007 2008 2009 |
#ifdef CONFIG_CHECKPOINT_RESTORE if (opt == PR_SET_MM_MAP || opt == PR_SET_MM_MAP_SIZE) return prctl_set_mm_map(opt, (const void __user *)addr, arg4); #endif |
79f0713d4 prctl: use CAP_SY... |
2010 |
if (!capable(CAP_SYS_RESOURCE)) |
028ee4be3 c/r: prctl: add P... |
2011 |
return -EPERM; |
6e399cd14 prctl: avoid usin... |
2012 2013 |
if (opt == PR_SET_MM_EXE_FILE) return prctl_set_mm_exe_file(mm, (unsigned int)addr); |
b32dfe377 c/r: prctl: add a... |
2014 |
|
4a00e9df2 prctl: more prctl... |
2015 2016 |
if (opt == PR_SET_MM_AUXV) return prctl_set_auxv(mm, addr, arg4); |
1ad75b9e1 c/r: prctl: add m... |
2017 |
if (addr >= TASK_SIZE || addr < mmap_min_addr) |
028ee4be3 c/r: prctl: add P... |
2018 |
return -EINVAL; |
fe8c7f5cb c/r: prctl: exten... |
2019 |
error = -EINVAL; |
ddf1d398e prctl: take mmap ... |
2020 |
down_write(&mm->mmap_sem); |
028ee4be3 c/r: prctl: add P... |
2021 |
vma = find_vma(mm, addr); |
4a00e9df2 prctl: more prctl... |
2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 |
prctl_map.start_code = mm->start_code; prctl_map.end_code = mm->end_code; prctl_map.start_data = mm->start_data; prctl_map.end_data = mm->end_data; prctl_map.start_brk = mm->start_brk; prctl_map.brk = mm->brk; prctl_map.start_stack = mm->start_stack; prctl_map.arg_start = mm->arg_start; prctl_map.arg_end = mm->arg_end; prctl_map.env_start = mm->env_start; prctl_map.env_end = mm->env_end; prctl_map.auxv = NULL; prctl_map.auxv_size = 0; prctl_map.exe_fd = -1; |
028ee4be3 c/r: prctl: add P... |
2036 2037 |
switch (opt) { case PR_SET_MM_START_CODE: |
4a00e9df2 prctl: more prctl... |
2038 |
prctl_map.start_code = addr; |
fe8c7f5cb c/r: prctl: exten... |
2039 |
break; |
028ee4be3 c/r: prctl: add P... |
2040 |
case PR_SET_MM_END_CODE: |
4a00e9df2 prctl: more prctl... |
2041 |
prctl_map.end_code = addr; |
028ee4be3 c/r: prctl: add P... |
2042 |
break; |
028ee4be3 c/r: prctl: add P... |
2043 |
case PR_SET_MM_START_DATA: |
4a00e9df2 prctl: more prctl... |
2044 |
prctl_map.start_data = addr; |
028ee4be3 c/r: prctl: add P... |
2045 |
break; |
fe8c7f5cb c/r: prctl: exten... |
2046 |
case PR_SET_MM_END_DATA: |
4a00e9df2 prctl: more prctl... |
2047 2048 2049 2050 |
prctl_map.end_data = addr; break; case PR_SET_MM_START_STACK: prctl_map.start_stack = addr; |
028ee4be3 c/r: prctl: add P... |
2051 |
break; |
028ee4be3 c/r: prctl: add P... |
2052 |
case PR_SET_MM_START_BRK: |
4a00e9df2 prctl: more prctl... |
2053 |
prctl_map.start_brk = addr; |
028ee4be3 c/r: prctl: add P... |
2054 |
break; |
028ee4be3 c/r: prctl: add P... |
2055 |
case PR_SET_MM_BRK: |
4a00e9df2 prctl: more prctl... |
2056 |
prctl_map.brk = addr; |
028ee4be3 c/r: prctl: add P... |
2057 |
break; |
4a00e9df2 prctl: more prctl... |
2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 |
case PR_SET_MM_ARG_START: prctl_map.arg_start = addr; break; case PR_SET_MM_ARG_END: prctl_map.arg_end = addr; break; case PR_SET_MM_ENV_START: prctl_map.env_start = addr; break; case PR_SET_MM_ENV_END: prctl_map.env_end = addr; break; default: goto out; } error = validate_prctl_map(&prctl_map); if (error) goto out; |
028ee4be3 c/r: prctl: add P... |
2077 |
|
4a00e9df2 prctl: more prctl... |
2078 |
switch (opt) { |
fe8c7f5cb c/r: prctl: exten... |
2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 |
/* * If command line arguments and environment * are placed somewhere else on stack, we can * set them up here, ARG_START/END to setup * command line argumets and ENV_START/END * for environment. */ case PR_SET_MM_START_STACK: case PR_SET_MM_ARG_START: case PR_SET_MM_ARG_END: case PR_SET_MM_ENV_START: case PR_SET_MM_ENV_END: if (!vma) { error = -EFAULT; goto out; } |
028ee4be3 c/r: prctl: add P... |
2095 |
} |
4a00e9df2 prctl: more prctl... |
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 |
mm->start_code = prctl_map.start_code; mm->end_code = prctl_map.end_code; mm->start_data = prctl_map.start_data; mm->end_data = prctl_map.end_data; mm->start_brk = prctl_map.start_brk; mm->brk = prctl_map.brk; mm->start_stack = prctl_map.start_stack; mm->arg_start = prctl_map.arg_start; mm->arg_end = prctl_map.arg_end; mm->env_start = prctl_map.env_start; mm->env_end = prctl_map.env_end; |
028ee4be3 c/r: prctl: add P... |
2107 |
error = 0; |
028ee4be3 c/r: prctl: add P... |
2108 |
out: |
ddf1d398e prctl: take mmap ... |
2109 |
up_write(&mm->mmap_sem); |
028ee4be3 c/r: prctl: add P... |
2110 2111 |
return error; } |
300f786b2 c/r: prctl: add a... |
2112 |
|
52b369415 kernel/sys.c: mak... |
2113 |
#ifdef CONFIG_CHECKPOINT_RESTORE |
300f786b2 c/r: prctl: add a... |
2114 2115 2116 2117 |
static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr) { return put_user(me->clear_child_tid, tid_addr); } |
52b369415 kernel/sys.c: mak... |
2118 |
#else |
300f786b2 c/r: prctl: add a... |
2119 2120 2121 2122 |
static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr) { return -EINVAL; } |
028ee4be3 c/r: prctl: add P... |
2123 |
#endif |
749860ce2 prctl: propagate ... |
2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 |
static int propagate_has_child_subreaper(struct task_struct *p, void *data) { /* * If task has has_child_subreaper - all its decendants * already have these flag too and new decendants will * inherit it on fork, skip them. * * If we've found child_reaper - skip descendants in * it's subtree as they will never get out pidns. */ if (p->signal->has_child_subreaper || is_child_reaper(task_pid(p))) return 0; p->signal->has_child_subreaper = 1; return 1; } |
7bbf1373e nospec: Allow get... |
2141 |
int __weak arch_prctl_spec_ctrl_get(struct task_struct *t, unsigned long which) |
b617cfc85 prctl: Add specul... |
2142 2143 2144 |
{ return -EINVAL; } |
7bbf1373e nospec: Allow get... |
2145 2146 |
int __weak arch_prctl_spec_ctrl_set(struct task_struct *t, unsigned long which, unsigned long ctrl) |
b617cfc85 prctl: Add specul... |
2147 2148 2149 |
{ return -EINVAL; } |
c4ea37c26 [CVE-2009-0029] S... |
2150 2151 |
SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, unsigned long, arg4, unsigned long, arg5) |
1da177e4c Linux-2.6.12-rc2 |
2152 |
{ |
b6dff3ec5 CRED: Separate ta... |
2153 2154 2155 |
struct task_struct *me = current; unsigned char comm[sizeof(me->comm)]; long error; |
1da177e4c Linux-2.6.12-rc2 |
2156 |
|
d84f4f992 CRED: Inaugurate ... |
2157 2158 |
error = security_task_prctl(option, arg2, arg3, arg4, arg5); if (error != -ENOSYS) |
1da177e4c Linux-2.6.12-rc2 |
2159 |
return error; |
d84f4f992 CRED: Inaugurate ... |
2160 |
error = 0; |
1da177e4c Linux-2.6.12-rc2 |
2161 |
switch (option) { |
f3cbd435b sys_prctl(): codi... |
2162 2163 2164 |
case PR_SET_PDEATHSIG: if (!valid_signal(arg2)) { error = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
2165 |
break; |
f3cbd435b sys_prctl(): codi... |
2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 |
} me->pdeath_signal = arg2; break; case PR_GET_PDEATHSIG: error = put_user(me->pdeath_signal, (int __user *)arg2); break; case PR_GET_DUMPABLE: error = get_dumpable(me->mm); break; case PR_SET_DUMPABLE: if (arg2 != SUID_DUMP_DISABLE && arg2 != SUID_DUMP_USER) { error = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
2178 |
break; |
f3cbd435b sys_prctl(): codi... |
2179 2180 2181 |
} set_dumpable(me->mm, arg2); break; |
1da177e4c Linux-2.6.12-rc2 |
2182 |
|
f3cbd435b sys_prctl(): codi... |
2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 |
case PR_SET_UNALIGN: error = SET_UNALIGN_CTL(me, arg2); break; case PR_GET_UNALIGN: error = GET_UNALIGN_CTL(me, arg2); break; case PR_SET_FPEMU: error = SET_FPEMU_CTL(me, arg2); break; case PR_GET_FPEMU: error = GET_FPEMU_CTL(me, arg2); break; case PR_SET_FPEXC: error = SET_FPEXC_CTL(me, arg2); break; case PR_GET_FPEXC: error = GET_FPEXC_CTL(me, arg2); break; case PR_GET_TIMING: error = PR_TIMING_STATISTICAL; break; case PR_SET_TIMING: if (arg2 != PR_TIMING_STATISTICAL) error = -EINVAL; break; case PR_SET_NAME: comm[sizeof(me->comm) - 1] = 0; if (strncpy_from_user(comm, (char __user *)arg2, sizeof(me->comm) - 1) < 0) return -EFAULT; set_task_comm(me, comm); proc_comm_connector(me); break; case PR_GET_NAME: get_task_comm(comm, me); if (copy_to_user((char __user *)arg2, comm, sizeof(comm))) return -EFAULT; break; case PR_GET_ENDIAN: error = GET_ENDIAN(me, arg2); break; case PR_SET_ENDIAN: error = SET_ENDIAN(me, arg2); break; case PR_GET_SECCOMP: error = prctl_get_seccomp(); break; case PR_SET_SECCOMP: error = prctl_set_seccomp(arg2, (char __user *)arg3); break; case PR_GET_TSC: error = GET_TSC_CTL(arg2); break; case PR_SET_TSC: error = SET_TSC_CTL(arg2); break; case PR_TASK_PERF_EVENTS_DISABLE: error = perf_event_task_disable(); break; case PR_TASK_PERF_EVENTS_ENABLE: error = perf_event_task_enable(); break; case PR_GET_TIMERSLACK: |
da8b44d5a timer: convert ti... |
2246 2247 2248 2249 |
if (current->timer_slack_ns > ULONG_MAX) error = ULONG_MAX; else error = current->timer_slack_ns; |
f3cbd435b sys_prctl(): codi... |
2250 2251 2252 2253 |
break; case PR_SET_TIMERSLACK: if (arg2 <= 0) current->timer_slack_ns = |
6976675d9 hrtimer: create a... |
2254 |
current->default_timer_slack_ns; |
f3cbd435b sys_prctl(): codi... |
2255 2256 2257 2258 2259 2260 2261 2262 2263 |
else current->timer_slack_ns = arg2; break; case PR_MCE_KILL: if (arg4 | arg5) return -EINVAL; switch (arg2) { case PR_MCE_KILL_CLEAR: if (arg3 != 0) |
4db96cf07 HWPOISON: Add PR_... |
2264 |
return -EINVAL; |
f3cbd435b sys_prctl(): codi... |
2265 |
current->flags &= ~PF_MCE_PROCESS; |
4db96cf07 HWPOISON: Add PR_... |
2266 |
break; |
f3cbd435b sys_prctl(): codi... |
2267 2268 2269 2270 2271 2272 2273 2274 2275 |
case PR_MCE_KILL_SET: current->flags |= PF_MCE_PROCESS; if (arg3 == PR_MCE_KILL_EARLY) current->flags |= PF_MCE_EARLY; else if (arg3 == PR_MCE_KILL_LATE) current->flags &= ~PF_MCE_EARLY; else if (arg3 == PR_MCE_KILL_DEFAULT) current->flags &= ~(PF_MCE_EARLY|PF_MCE_PROCESS); |
1087e9b4f HWPOISON: Clean u... |
2276 |
else |
259e5e6c7 Add PR_{GET,SET}_... |
2277 |
return -EINVAL; |
259e5e6c7 Add PR_{GET,SET}_... |
2278 |
break; |
1da177e4c Linux-2.6.12-rc2 |
2279 |
default: |
f3cbd435b sys_prctl(): codi... |
2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 |
return -EINVAL; } break; case PR_MCE_KILL_GET: if (arg2 | arg3 | arg4 | arg5) return -EINVAL; if (current->flags & PF_MCE_PROCESS) error = (current->flags & PF_MCE_EARLY) ? PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; else error = PR_MCE_KILL_DEFAULT; break; case PR_SET_MM: error = prctl_set_mm(arg2, arg3, arg4, arg5); break; case PR_GET_TID_ADDRESS: error = prctl_get_tid_address(me, (int __user **)arg2); break; case PR_SET_CHILD_SUBREAPER: me->signal->is_child_subreaper = !!arg2; |
749860ce2 prctl: propagate ... |
2300 2301 2302 2303 |
if (!arg2) break; walk_process_tree(me, propagate_has_child_subreaper, NULL); |
f3cbd435b sys_prctl(): codi... |
2304 2305 2306 2307 2308 2309 2310 2311 |
break; case PR_GET_CHILD_SUBREAPER: error = put_user(me->signal->is_child_subreaper, (int __user *)arg2); break; case PR_SET_NO_NEW_PRIVS: if (arg2 != 1 || arg3 || arg4 || arg5) return -EINVAL; |
1d4457f99 sched: move no_ne... |
2312 |
task_set_no_new_privs(current); |
f3cbd435b sys_prctl(): codi... |
2313 2314 2315 2316 |
break; case PR_GET_NO_NEW_PRIVS: if (arg2 || arg3 || arg4 || arg5) return -EINVAL; |
1d4457f99 sched: move no_ne... |
2317 |
return task_no_new_privs(current) ? 1 : 0; |
a0715cc22 mm, thp: add VM_I... |
2318 2319 2320 |
case PR_GET_THP_DISABLE: if (arg2 || arg3 || arg4 || arg5) return -EINVAL; |
186003323 mm: make PR_SET_T... |
2321 |
error = !!test_bit(MMF_DISABLE_THP, &me->mm->flags); |
a0715cc22 mm, thp: add VM_I... |
2322 2323 2324 2325 |
break; case PR_SET_THP_DISABLE: if (arg3 || arg4 || arg5) return -EINVAL; |
17b0573d7 prctl: make PR_SE... |
2326 2327 |
if (down_write_killable(&me->mm->mmap_sem)) return -EINTR; |
a0715cc22 mm, thp: add VM_I... |
2328 |
if (arg2) |
186003323 mm: make PR_SET_T... |
2329 |
set_bit(MMF_DISABLE_THP, &me->mm->flags); |
a0715cc22 mm, thp: add VM_I... |
2330 |
else |
186003323 mm: make PR_SET_T... |
2331 |
clear_bit(MMF_DISABLE_THP, &me->mm->flags); |
a0715cc22 mm, thp: add VM_I... |
2332 2333 |
up_write(&me->mm->mmap_sem); break; |
fe3d197f8 x86, mpx: On-dema... |
2334 |
case PR_MPX_ENABLE_MANAGEMENT: |
e9d1b4f3c x86, mpx: Strictl... |
2335 2336 |
if (arg2 || arg3 || arg4 || arg5) return -EINVAL; |
46a6e0cf1 x86/mpx: Clean up... |
2337 |
error = MPX_ENABLE_MANAGEMENT(); |
fe3d197f8 x86, mpx: On-dema... |
2338 2339 |
break; case PR_MPX_DISABLE_MANAGEMENT: |
e9d1b4f3c x86, mpx: Strictl... |
2340 2341 |
if (arg2 || arg3 || arg4 || arg5) return -EINVAL; |
46a6e0cf1 x86/mpx: Clean up... |
2342 |
error = MPX_DISABLE_MANAGEMENT(); |
fe3d197f8 x86, mpx: On-dema... |
2343 |
break; |
9791554b4 MIPS,prctl: add P... |
2344 2345 2346 2347 2348 2349 |
case PR_SET_FP_MODE: error = SET_FP_MODE(me, arg2); break; case PR_GET_FP_MODE: error = GET_FP_MODE(me); break; |
2d2123bc7 arm64/sve: Add pr... |
2350 2351 2352 2353 2354 2355 |
case PR_SVE_SET_VL: error = SVE_SET_VL(arg2); break; case PR_SVE_GET_VL: error = SVE_GET_VL(); break; |
b617cfc85 prctl: Add specul... |
2356 2357 2358 |
case PR_GET_SPECULATION_CTRL: if (arg3 || arg4 || arg5) return -EINVAL; |
7bbf1373e nospec: Allow get... |
2359 |
error = arch_prctl_spec_ctrl_get(me, arg2); |
b617cfc85 prctl: Add specul... |
2360 2361 2362 2363 |
break; case PR_SET_SPECULATION_CTRL: if (arg4 || arg5) return -EINVAL; |
7bbf1373e nospec: Allow get... |
2364 |
error = arch_prctl_spec_ctrl_set(me, arg2, arg3); |
b617cfc85 prctl: Add specul... |
2365 |
break; |
f3cbd435b sys_prctl(): codi... |
2366 2367 2368 |
default: error = -EINVAL; break; |
1da177e4c Linux-2.6.12-rc2 |
2369 2370 2371 |
} return error; } |
3cfc348bf [PATCH] x86: Add ... |
2372 |
|
836f92adf [CVE-2009-0029] S... |
2373 2374 |
SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, struct getcpu_cache __user *, unused) |
3cfc348bf [PATCH] x86: Add ... |
2375 2376 2377 |
{ int err = 0; int cpu = raw_smp_processor_id(); |
ec94fc3d5 kernel/sys.c: whi... |
2378 |
|
3cfc348bf [PATCH] x86: Add ... |
2379 2380 2381 2382 |
if (cpup) err |= put_user(cpu, cpup); if (nodep) err |= put_user(cpu_to_node(cpu), nodep); |
3cfc348bf [PATCH] x86: Add ... |
2383 2384 |
return err ? -EFAULT : 0; } |
10a0a8d4e Add common orderl... |
2385 |
|
4a22f1663 kernel/timer.c: m... |
2386 2387 2388 2389 2390 2391 2392 2393 |
/** * do_sysinfo - fill in sysinfo struct * @info: pointer to buffer to fill */ static int do_sysinfo(struct sysinfo *info) { unsigned long mem_total, sav_total; unsigned int mem_unit, bitcount; |
dc1b7b6ca sysinfo: Remove g... |
2394 |
struct timespec64 tp; |
4a22f1663 kernel/timer.c: m... |
2395 2396 |
memset(info, 0, sizeof(struct sysinfo)); |
dc1b7b6ca sysinfo: Remove g... |
2397 |
ktime_get_boottime_ts64(&tp); |
4a22f1663 kernel/timer.c: m... |
2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 |
info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0); get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT); info->procs = nr_threads; si_meminfo(info); si_swapinfo(info); /* * If the sum of all the available memory (i.e. ram + swap) * is less than can be stored in a 32 bit unsigned long then * we can be binary compatible with 2.2.x kernels. If not, * well, in that case 2.2.x was broken anyways... * * -Erik Andersen <andersee@debian.org> */ mem_total = info->totalram + info->totalswap; if (mem_total < info->totalram || mem_total < info->totalswap) goto out; bitcount = 0; mem_unit = info->mem_unit; while (mem_unit > 1) { bitcount++; mem_unit >>= 1; sav_total = mem_total; mem_total <<= 1; if (mem_total < sav_total) goto out; } /* * If mem_total did not overflow, multiply all memory values by * info->mem_unit and set it to 1. This leaves things compatible * with 2.2.x, and also retains compatibility with earlier 2.4.x * kernels... */ info->mem_unit = 1; info->totalram <<= bitcount; info->freeram <<= bitcount; info->sharedram <<= bitcount; info->bufferram <<= bitcount; info->totalswap <<= bitcount; info->freeswap <<= bitcount; info->totalhigh <<= bitcount; info->freehigh <<= bitcount; out: return 0; } SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info) { struct sysinfo val; do_sysinfo(&val); if (copy_to_user(info, &val, sizeof(struct sysinfo))) return -EFAULT; return 0; } #ifdef CONFIG_COMPAT struct compat_sysinfo { s32 uptime; u32 loads[3]; u32 totalram; u32 freeram; u32 sharedram; u32 bufferram; u32 totalswap; u32 freeswap; u16 procs; u16 pad; u32 totalhigh; u32 freehigh; u32 mem_unit; char _f[20-2*sizeof(u32)-sizeof(int)]; }; COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info) { struct sysinfo s; do_sysinfo(&s); /* Check to see if any memory value is too large for 32-bit and scale * down if needed */ |
0baae41ea kernel/sys.c: com... |
2490 |
if (upper_32_bits(s.totalram) || upper_32_bits(s.totalswap)) { |
4a22f1663 kernel/timer.c: m... |
2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 |
int bitcount = 0; while (s.mem_unit < PAGE_SIZE) { s.mem_unit <<= 1; bitcount++; } s.totalram >>= bitcount; s.freeram >>= bitcount; s.sharedram >>= bitcount; s.bufferram >>= bitcount; s.totalswap >>= bitcount; s.freeswap >>= bitcount; s.totalhigh >>= bitcount; s.freehigh >>= bitcount; } if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || __put_user(s.uptime, &info->uptime) || __put_user(s.loads[0], &info->loads[0]) || __put_user(s.loads[1], &info->loads[1]) || __put_user(s.loads[2], &info->loads[2]) || __put_user(s.totalram, &info->totalram) || __put_user(s.freeram, &info->freeram) || __put_user(s.sharedram, &info->sharedram) || __put_user(s.bufferram, &info->bufferram) || __put_user(s.totalswap, &info->totalswap) || __put_user(s.freeswap, &info->freeswap) || __put_user(s.procs, &info->procs) || __put_user(s.totalhigh, &info->totalhigh) || __put_user(s.freehigh, &info->freehigh) || __put_user(s.mem_unit, &info->mem_unit)) return -EFAULT; return 0; } #endif /* CONFIG_COMPAT */ |