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kernel/sys.c
46.6 KB
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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> #include <linux/kexec.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/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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|
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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 <asm/uaccess.h> #include <asm/io.h> #include <asm/unistd.h> #ifndef SET_UNALIGN_CTL # define SET_UNALIGN_CTL(a,b) (-EINVAL) #endif #ifndef GET_UNALIGN_CTL # define GET_UNALIGN_CTL(a,b) (-EINVAL) #endif #ifndef SET_FPEMU_CTL # define SET_FPEMU_CTL(a,b) (-EINVAL) #endif #ifndef GET_FPEMU_CTL # define GET_FPEMU_CTL(a,b) (-EINVAL) #endif #ifndef SET_FPEXC_CTL # define SET_FPEXC_CTL(a,b) (-EINVAL) #endif #ifndef GET_FPEXC_CTL # define GET_FPEXC_CTL(a,b) (-EINVAL) #endif |
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#ifndef GET_ENDIAN # define GET_ENDIAN(a,b) (-EINVAL) #endif #ifndef SET_ENDIAN # define SET_ENDIAN(a,b) (-EINVAL) #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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/* * 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; #ifdef CONFIG_UID16 EXPORT_SYMBOL(overflowuid); EXPORT_SYMBOL(overflowgid); #endif /* * 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; int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; EXPORT_SYMBOL(fs_overflowuid); EXPORT_SYMBOL(fs_overflowgid); /* * this indicates whether you can reboot with ctrl-alt-del: the default is yes */ int C_A_D = 1; |
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struct pid *cad_pid; EXPORT_SYMBOL(cad_pid); |
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/* |
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* If set, this is used for preparing the system to power off. */ void (*pm_power_off_prepare)(void); |
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|
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/* |
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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); if (pcred->user->user_ns == cred->user->user_ns && (pcred->uid == cred->euid || pcred->euid == cred->euid)) return true; if (ns_capable(pcred->user->user_ns, CAP_SYS_NICE)) 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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|
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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; if (niceval < -20) niceval = -20; if (niceval > 19) niceval = 19; |
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rcu_read_lock(); |
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read_lock(&tasklist_lock); switch (which) { case PRIO_PROCESS: |
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if (who) |
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p = find_task_by_vpid(who); |
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else p = current; |
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if (p) error = set_one_prio(p, niceval, error); break; case PRIO_PGRP: |
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if (who) |
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pgrp = find_vpid(who); |
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else pgrp = task_pgrp(current); |
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do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
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error = set_one_prio(p, niceval, error); |
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} while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
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break; case PRIO_USER: |
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user = (struct user_struct *) cred->user; |
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if (!who) |
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who = cred->uid; else if ((who != cred->uid) && !(user = find_user(who))) goto out_unlock; /* No processes for this user */ |
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|
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do_each_thread(g, p) { |
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if (__task_cred(p)->uid == who) |
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error = set_one_prio(p, niceval, error); |
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} while_each_thread(g, p); |
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if (who != cred->uid) |
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free_uid(user); /* For find_user() */ break; } 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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|
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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) { case PRIO_PROCESS: |
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if (who) |
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p = find_task_by_vpid(who); |
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else p = current; |
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if (p) { niceval = 20 - task_nice(p); if (niceval > retval) retval = niceval; } break; case PRIO_PGRP: |
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if (who) |
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pgrp = find_vpid(who); |
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else pgrp = task_pgrp(current); |
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do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
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niceval = 20 - task_nice(p); if (niceval > retval) retval = niceval; |
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} while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
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break; case PRIO_USER: |
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user = (struct user_struct *) cred->user; |
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if (!who) |
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who = cred->uid; else if ((who != cred->uid) && !(user = find_user(who))) goto out_unlock; /* No processes for this user */ |
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|
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do_each_thread(g, p) { |
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if (__task_cred(p)->uid == who) { |
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niceval = 20 - task_nice(p); if (niceval > retval) retval = niceval; } |
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} while_each_thread(g, p); |
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if (who != cred->uid) |
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free_uid(user); /* for find_user() */ break; } out_unlock: read_unlock(&tasklist_lock); |
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rcu_read_unlock(); |
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return retval; } |
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/** * emergency_restart - reboot the system * * Without shutting down any hardware or taking any locks * reboot the system. This is called when we know we are in * trouble so this is our best effort to reboot. This is * safe to call in interrupt context. */ |
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void emergency_restart(void) { |
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kmsg_dump(KMSG_DUMP_EMERG); |
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machine_emergency_restart(); } EXPORT_SYMBOL_GPL(emergency_restart); |
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void kernel_restart_prepare(char *cmd) |
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{ |
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blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
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system_state = SYSTEM_RESTART; |
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usermodehelper_disable(); |
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device_shutdown(); |
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syscore_shutdown(); |
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} |
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/** |
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* register_reboot_notifier - Register function to be called at reboot time * @nb: Info about notifier function to be called * * Registers a function with the list of functions * to be called at reboot time. * * Currently always returns zero, as blocking_notifier_chain_register() * always returns zero. */ int register_reboot_notifier(struct notifier_block *nb) { return blocking_notifier_chain_register(&reboot_notifier_list, nb); } EXPORT_SYMBOL(register_reboot_notifier); /** * unregister_reboot_notifier - Unregister previously registered reboot notifier * @nb: Hook to be unregistered * * Unregisters a previously registered reboot * notifier function. * * Returns zero on success, or %-ENOENT on failure. */ int unregister_reboot_notifier(struct notifier_block *nb) { return blocking_notifier_chain_unregister(&reboot_notifier_list, nb); } EXPORT_SYMBOL(unregister_reboot_notifier); /** |
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* kernel_restart - reboot the system * @cmd: pointer to buffer containing command to execute for restart |
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* or %NULL |
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* * Shutdown everything and perform a clean reboot. * This is not safe to call in interrupt context. */ |
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void kernel_restart(char *cmd) { kernel_restart_prepare(cmd); |
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if (!cmd) |
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printk(KERN_EMERG "Restarting system. "); |
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else |
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printk(KERN_EMERG "Restarting system with command '%s'. ", cmd); |
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kmsg_dump(KMSG_DUMP_RESTART); |
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machine_restart(cmd); } EXPORT_SYMBOL_GPL(kernel_restart); |
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static void kernel_shutdown_prepare(enum system_states state) |
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{ |
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blocking_notifier_call_chain(&reboot_notifier_list, |
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(state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); system_state = state; |
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usermodehelper_disable(); |
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device_shutdown(); } |
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/** * kernel_halt - halt the system * * Shutdown everything and perform a clean system halt. */ |
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void kernel_halt(void) { |
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kernel_shutdown_prepare(SYSTEM_HALT); |
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syscore_shutdown(); |
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printk(KERN_EMERG "System halted. "); |
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kmsg_dump(KMSG_DUMP_HALT); |
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machine_halt(); } |
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|
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EXPORT_SYMBOL_GPL(kernel_halt); |
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/** * kernel_power_off - power_off the system * * Shutdown everything and perform a clean system power_off. */ |
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void kernel_power_off(void) { |
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kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
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if (pm_power_off_prepare) pm_power_off_prepare(); |
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disable_nonboot_cpus(); |
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syscore_shutdown(); |
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printk(KERN_EMERG "Power down. "); |
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kmsg_dump(KMSG_DUMP_POWEROFF); |
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machine_power_off(); } EXPORT_SYMBOL_GPL(kernel_power_off); |
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static DEFINE_MUTEX(reboot_mutex); |
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/* * Reboot system call: for obvious reasons only root may call it, * and even root needs to set up some magic numbers in the registers * so that some mistake won't make this reboot the whole machine. * You can also set the meaning of the ctrl-alt-del-key here. * * reboot doesn't sync: do that yourself before calling this. */ |
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SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, void __user *, arg) |
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{ char buffer[256]; |
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int ret = 0; |
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/* We only trust the superuser with rebooting the system. */ if (!capable(CAP_SYS_BOOT)) return -EPERM; /* For safety, we require "magic" arguments. */ if (magic1 != LINUX_REBOOT_MAGIC1 || (magic2 != LINUX_REBOOT_MAGIC2 && magic2 != LINUX_REBOOT_MAGIC2A && magic2 != LINUX_REBOOT_MAGIC2B && magic2 != LINUX_REBOOT_MAGIC2C)) return -EINVAL; |
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/* Instead of trying to make the power_off code look like * halt when pm_power_off is not set do it the easy way. */ if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) cmd = LINUX_REBOOT_CMD_HALT; |
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mutex_lock(&reboot_mutex); |
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switch (cmd) { case LINUX_REBOOT_CMD_RESTART: |
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kernel_restart(NULL); |
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break; case LINUX_REBOOT_CMD_CAD_ON: C_A_D = 1; break; case LINUX_REBOOT_CMD_CAD_OFF: C_A_D = 0; break; case LINUX_REBOOT_CMD_HALT: |
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kernel_halt(); |
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do_exit(0); |
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panic("cannot halt"); |
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case LINUX_REBOOT_CMD_POWER_OFF: |
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kernel_power_off(); |
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do_exit(0); break; case LINUX_REBOOT_CMD_RESTART2: if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { |
6f15fa500 sys: Remove BKL f... |
471 472 |
ret = -EFAULT; break; |
1da177e4c Linux-2.6.12-rc2 |
473 474 |
} buffer[sizeof(buffer) - 1] = '\0'; |
4a00ea1e1 [PATCH] Refactor ... |
475 |
kernel_restart(buffer); |
1da177e4c Linux-2.6.12-rc2 |
476 |
break; |
3ab835213 kexec jump |
477 |
#ifdef CONFIG_KEXEC |
dc009d924 [PATCH] kexec: ad... |
478 |
case LINUX_REBOOT_CMD_KEXEC: |
3d26dcf76 kernel/sys.c: cle... |
479 480 |
ret = kernel_kexec(); break; |
3ab835213 kexec jump |
481 |
#endif |
4a00ea1e1 [PATCH] Refactor ... |
482 |
|
b0cb1a19d Replace CONFIG_SO... |
483 |
#ifdef CONFIG_HIBERNATION |
1da177e4c Linux-2.6.12-rc2 |
484 |
case LINUX_REBOOT_CMD_SW_SUSPEND: |
3d26dcf76 kernel/sys.c: cle... |
485 486 |
ret = hibernate(); break; |
1da177e4c Linux-2.6.12-rc2 |
487 488 489 |
#endif default: |
3d26dcf76 kernel/sys.c: cle... |
490 491 |
ret = -EINVAL; break; |
1da177e4c Linux-2.6.12-rc2 |
492 |
} |
6f15fa500 sys: Remove BKL f... |
493 |
mutex_unlock(&reboot_mutex); |
3d26dcf76 kernel/sys.c: cle... |
494 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
495 |
} |
65f27f384 WorkStruct: Pass ... |
496 |
static void deferred_cad(struct work_struct *dummy) |
1da177e4c Linux-2.6.12-rc2 |
497 |
{ |
abcd9e51f [PATCH] Make ctrl... |
498 |
kernel_restart(NULL); |
1da177e4c Linux-2.6.12-rc2 |
499 500 501 502 503 504 505 506 507 |
} /* * This function gets called by ctrl-alt-del - ie the keyboard interrupt. * As it's called within an interrupt, it may NOT sync: the only choice * is whether to reboot at once, or just ignore the ctrl-alt-del. */ void ctrl_alt_del(void) { |
65f27f384 WorkStruct: Pass ... |
508 |
static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4c Linux-2.6.12-rc2 |
509 510 511 512 |
if (C_A_D) schedule_work(&cad_work); else |
9ec52099e [PATCH] replace c... |
513 |
kill_cad_pid(SIGINT, 1); |
1da177e4c Linux-2.6.12-rc2 |
514 515 |
} |
1da177e4c Linux-2.6.12-rc2 |
516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 |
/* * 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 * 100% compatible with POSIX with saved IDs. * * SMP: There are not races, the GIDs are checked only by filesystem * operations (as far as semantic preservation is concerned). */ |
ae1251ab7 [CVE-2009-0029] S... |
534 |
SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4c Linux-2.6.12-rc2 |
535 |
{ |
d84f4f992 CRED: Inaugurate ... |
536 537 |
const struct cred *old; struct cred *new; |
1da177e4c Linux-2.6.12-rc2 |
538 |
int retval; |
d84f4f992 CRED: Inaugurate ... |
539 540 541 542 |
new = prepare_creds(); if (!new) return -ENOMEM; old = current_cred(); |
d84f4f992 CRED: Inaugurate ... |
543 |
retval = -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
544 |
if (rgid != (gid_t) -1) { |
d84f4f992 CRED: Inaugurate ... |
545 546 |
if (old->gid == rgid || old->egid == rgid || |
fc832ad36 userns: user name... |
547 |
nsown_capable(CAP_SETGID)) |
d84f4f992 CRED: Inaugurate ... |
548 |
new->gid = rgid; |
1da177e4c Linux-2.6.12-rc2 |
549 |
else |
d84f4f992 CRED: Inaugurate ... |
550 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
551 552 |
} if (egid != (gid_t) -1) { |
d84f4f992 CRED: Inaugurate ... |
553 554 555 |
if (old->gid == egid || old->egid == egid || old->sgid == egid || |
fc832ad36 userns: user name... |
556 |
nsown_capable(CAP_SETGID)) |
d84f4f992 CRED: Inaugurate ... |
557 |
new->egid = egid; |
756184b7d [PATCH] CodingSty... |
558 |
else |
d84f4f992 CRED: Inaugurate ... |
559 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
560 |
} |
d84f4f992 CRED: Inaugurate ... |
561 |
|
1da177e4c Linux-2.6.12-rc2 |
562 |
if (rgid != (gid_t) -1 || |
d84f4f992 CRED: Inaugurate ... |
563 564 565 566 567 568 569 570 571 |
(egid != (gid_t) -1 && egid != old->gid)) new->sgid = new->egid; new->fsgid = new->egid; return commit_creds(new); error: abort_creds(new); return retval; |
1da177e4c Linux-2.6.12-rc2 |
572 573 574 575 576 577 578 |
} /* * setgid() is implemented like SysV w/ SAVED_IDS * * SMP: Same implicit races as above. */ |
ae1251ab7 [CVE-2009-0029] S... |
579 |
SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4c Linux-2.6.12-rc2 |
580 |
{ |
d84f4f992 CRED: Inaugurate ... |
581 582 |
const struct cred *old; struct cred *new; |
1da177e4c Linux-2.6.12-rc2 |
583 |
int retval; |
d84f4f992 CRED: Inaugurate ... |
584 585 586 587 |
new = prepare_creds(); if (!new) return -ENOMEM; old = current_cred(); |
d84f4f992 CRED: Inaugurate ... |
588 |
retval = -EPERM; |
fc832ad36 userns: user name... |
589 |
if (nsown_capable(CAP_SETGID)) |
d84f4f992 CRED: Inaugurate ... |
590 591 592 |
new->gid = new->egid = new->sgid = new->fsgid = gid; else if (gid == old->gid || gid == old->sgid) new->egid = new->fsgid = gid; |
1da177e4c Linux-2.6.12-rc2 |
593 |
else |
d84f4f992 CRED: Inaugurate ... |
594 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
595 |
|
d84f4f992 CRED: Inaugurate ... |
596 597 598 599 600 |
return commit_creds(new); error: abort_creds(new); return retval; |
1da177e4c Linux-2.6.12-rc2 |
601 |
} |
54e991242 sched: don't allo... |
602 |
|
d84f4f992 CRED: Inaugurate ... |
603 604 605 606 |
/* * 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 |
607 608 |
{ struct user_struct *new_user; |
18b6e0414 User namespaces: ... |
609 |
new_user = alloc_uid(current_user_ns(), new->uid); |
1da177e4c Linux-2.6.12-rc2 |
610 611 |
if (!new_user) return -EAGAIN; |
72fa59970 move RLIMIT_NPROC... |
612 613 614 615 616 617 618 |
/* * 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 ... |
619 |
if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
72fa59970 move RLIMIT_NPROC... |
620 621 622 623 |
new_user != INIT_USER) current->flags |= PF_NPROC_EXCEEDED; else current->flags &= ~PF_NPROC_EXCEEDED; |
1da177e4c Linux-2.6.12-rc2 |
624 |
|
d84f4f992 CRED: Inaugurate ... |
625 626 |
free_uid(new->user); new->user = new_user; |
1da177e4c Linux-2.6.12-rc2 |
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 |
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 * 100% compatible with POSIX with saved IDs. */ |
ae1251ab7 [CVE-2009-0029] S... |
645 |
SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
1da177e4c Linux-2.6.12-rc2 |
646 |
{ |
d84f4f992 CRED: Inaugurate ... |
647 648 |
const struct cred *old; struct cred *new; |
1da177e4c Linux-2.6.12-rc2 |
649 |
int retval; |
d84f4f992 CRED: Inaugurate ... |
650 651 652 653 |
new = prepare_creds(); if (!new) return -ENOMEM; old = current_cred(); |
d84f4f992 CRED: Inaugurate ... |
654 |
retval = -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
655 |
if (ruid != (uid_t) -1) { |
d84f4f992 CRED: Inaugurate ... |
656 657 658 |
new->uid = ruid; if (old->uid != ruid && old->euid != ruid && |
fc832ad36 userns: user name... |
659 |
!nsown_capable(CAP_SETUID)) |
d84f4f992 CRED: Inaugurate ... |
660 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
661 662 663 |
} if (euid != (uid_t) -1) { |
d84f4f992 CRED: Inaugurate ... |
664 665 666 667 |
new->euid = euid; if (old->uid != euid && old->euid != euid && old->suid != euid && |
fc832ad36 userns: user name... |
668 |
!nsown_capable(CAP_SETUID)) |
d84f4f992 CRED: Inaugurate ... |
669 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
670 |
} |
54e991242 sched: don't allo... |
671 672 673 674 675 |
if (new->uid != old->uid) { retval = set_user(new); if (retval < 0) goto error; } |
1da177e4c Linux-2.6.12-rc2 |
676 |
if (ruid != (uid_t) -1 || |
d84f4f992 CRED: Inaugurate ... |
677 678 679 |
(euid != (uid_t) -1 && euid != old->uid)) new->suid = new->euid; new->fsuid = new->euid; |
1da177e4c Linux-2.6.12-rc2 |
680 |
|
d84f4f992 CRED: Inaugurate ... |
681 682 683 |
retval = security_task_fix_setuid(new, old, LSM_SETID_RE); if (retval < 0) goto error; |
1da177e4c Linux-2.6.12-rc2 |
684 |
|
d84f4f992 CRED: Inaugurate ... |
685 |
return commit_creds(new); |
1da177e4c Linux-2.6.12-rc2 |
686 |
|
d84f4f992 CRED: Inaugurate ... |
687 688 689 690 |
error: abort_creds(new); return retval; } |
1da177e4c Linux-2.6.12-rc2 |
691 692 693 694 695 696 697 698 699 700 701 702 |
/* * setuid() is implemented like SysV with SAVED_IDS * * Note that SAVED_ID's is deficient in that a setuid root program * like sendmail, for example, cannot set its uid to be a normal * 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 * regain them by swapping the real and effective uid. */ |
ae1251ab7 [CVE-2009-0029] S... |
703 |
SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4c Linux-2.6.12-rc2 |
704 |
{ |
d84f4f992 CRED: Inaugurate ... |
705 706 |
const struct cred *old; struct cred *new; |
1da177e4c Linux-2.6.12-rc2 |
707 |
int retval; |
d84f4f992 CRED: Inaugurate ... |
708 709 710 711 |
new = prepare_creds(); if (!new) return -ENOMEM; old = current_cred(); |
d84f4f992 CRED: Inaugurate ... |
712 |
retval = -EPERM; |
fc832ad36 userns: user name... |
713 |
if (nsown_capable(CAP_SETUID)) { |
d84f4f992 CRED: Inaugurate ... |
714 |
new->suid = new->uid = uid; |
54e991242 sched: don't allo... |
715 716 717 718 |
if (uid != old->uid) { retval = set_user(new); if (retval < 0) goto error; |
d84f4f992 CRED: Inaugurate ... |
719 720 721 |
} } else if (uid != old->uid && uid != new->suid) { goto error; |
1da177e4c Linux-2.6.12-rc2 |
722 |
} |
1da177e4c Linux-2.6.12-rc2 |
723 |
|
d84f4f992 CRED: Inaugurate ... |
724 725 726 727 728 |
new->fsuid = new->euid = uid; retval = security_task_fix_setuid(new, old, LSM_SETID_ID); if (retval < 0) goto error; |
1da177e4c Linux-2.6.12-rc2 |
729 |
|
d84f4f992 CRED: Inaugurate ... |
730 |
return commit_creds(new); |
1da177e4c Linux-2.6.12-rc2 |
731 |
|
d84f4f992 CRED: Inaugurate ... |
732 733 734 |
error: abort_creds(new); return retval; |
1da177e4c Linux-2.6.12-rc2 |
735 736 737 738 739 740 741 |
} /* * This function implements a generic ability to update ruid, euid, * and suid. This allows you to implement the 4.4 compatible seteuid(). */ |
ae1251ab7 [CVE-2009-0029] S... |
742 |
SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4c Linux-2.6.12-rc2 |
743 |
{ |
d84f4f992 CRED: Inaugurate ... |
744 745 |
const struct cred *old; struct cred *new; |
1da177e4c Linux-2.6.12-rc2 |
746 |
int retval; |
d84f4f992 CRED: Inaugurate ... |
747 748 749 |
new = prepare_creds(); if (!new) return -ENOMEM; |
d84f4f992 CRED: Inaugurate ... |
750 |
old = current_cred(); |
1da177e4c Linux-2.6.12-rc2 |
751 |
|
d84f4f992 CRED: Inaugurate ... |
752 |
retval = -EPERM; |
fc832ad36 userns: user name... |
753 |
if (!nsown_capable(CAP_SETUID)) { |
d84f4f992 CRED: Inaugurate ... |
754 755 756 757 758 759 760 761 762 |
if (ruid != (uid_t) -1 && ruid != old->uid && ruid != old->euid && ruid != old->suid) goto error; if (euid != (uid_t) -1 && euid != old->uid && euid != old->euid && euid != old->suid) goto error; if (suid != (uid_t) -1 && suid != old->uid && suid != old->euid && suid != old->suid) goto error; |
1da177e4c Linux-2.6.12-rc2 |
763 |
} |
d84f4f992 CRED: Inaugurate ... |
764 |
|
1da177e4c Linux-2.6.12-rc2 |
765 |
if (ruid != (uid_t) -1) { |
d84f4f992 CRED: Inaugurate ... |
766 |
new->uid = ruid; |
54e991242 sched: don't allo... |
767 768 769 770 771 |
if (ruid != old->uid) { retval = set_user(new); if (retval < 0) goto error; } |
1da177e4c Linux-2.6.12-rc2 |
772 |
} |
d84f4f992 CRED: Inaugurate ... |
773 774 |
if (euid != (uid_t) -1) new->euid = euid; |
1da177e4c Linux-2.6.12-rc2 |
775 |
if (suid != (uid_t) -1) |
d84f4f992 CRED: Inaugurate ... |
776 777 |
new->suid = suid; new->fsuid = new->euid; |
1da177e4c Linux-2.6.12-rc2 |
778 |
|
d84f4f992 CRED: Inaugurate ... |
779 780 781 |
retval = security_task_fix_setuid(new, old, LSM_SETID_RES); if (retval < 0) goto error; |
1da177e4c Linux-2.6.12-rc2 |
782 |
|
d84f4f992 CRED: Inaugurate ... |
783 |
return commit_creds(new); |
1da177e4c Linux-2.6.12-rc2 |
784 |
|
d84f4f992 CRED: Inaugurate ... |
785 786 787 |
error: abort_creds(new); return retval; |
1da177e4c Linux-2.6.12-rc2 |
788 |
} |
dbf040d9d [CVE-2009-0029] S... |
789 |
SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid) |
1da177e4c Linux-2.6.12-rc2 |
790 |
{ |
86a264abe CRED: Wrap curren... |
791 |
const struct cred *cred = current_cred(); |
1da177e4c Linux-2.6.12-rc2 |
792 |
int retval; |
86a264abe CRED: Wrap curren... |
793 794 |
if (!(retval = put_user(cred->uid, ruid)) && !(retval = put_user(cred->euid, euid))) |
b6dff3ec5 CRED: Separate ta... |
795 |
retval = put_user(cred->suid, suid); |
1da177e4c Linux-2.6.12-rc2 |
796 797 798 799 800 801 802 |
return retval; } /* * Same as above, but for rgid, egid, sgid. */ |
ae1251ab7 [CVE-2009-0029] S... |
803 |
SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4c Linux-2.6.12-rc2 |
804 |
{ |
d84f4f992 CRED: Inaugurate ... |
805 806 |
const struct cred *old; struct cred *new; |
1da177e4c Linux-2.6.12-rc2 |
807 |
int retval; |
d84f4f992 CRED: Inaugurate ... |
808 809 810 811 |
new = prepare_creds(); if (!new) return -ENOMEM; old = current_cred(); |
d84f4f992 CRED: Inaugurate ... |
812 |
retval = -EPERM; |
fc832ad36 userns: user name... |
813 |
if (!nsown_capable(CAP_SETGID)) { |
d84f4f992 CRED: Inaugurate ... |
814 815 816 817 818 819 820 821 822 |
if (rgid != (gid_t) -1 && rgid != old->gid && rgid != old->egid && rgid != old->sgid) goto error; if (egid != (gid_t) -1 && egid != old->gid && egid != old->egid && egid != old->sgid) goto error; if (sgid != (gid_t) -1 && sgid != old->gid && sgid != old->egid && sgid != old->sgid) goto error; |
1da177e4c Linux-2.6.12-rc2 |
823 |
} |
d84f4f992 CRED: Inaugurate ... |
824 |
|
1da177e4c Linux-2.6.12-rc2 |
825 |
if (rgid != (gid_t) -1) |
d84f4f992 CRED: Inaugurate ... |
826 827 828 |
new->gid = rgid; if (egid != (gid_t) -1) new->egid = egid; |
1da177e4c Linux-2.6.12-rc2 |
829 |
if (sgid != (gid_t) -1) |
d84f4f992 CRED: Inaugurate ... |
830 831 |
new->sgid = sgid; new->fsgid = new->egid; |
1da177e4c Linux-2.6.12-rc2 |
832 |
|
d84f4f992 CRED: Inaugurate ... |
833 834 835 836 837 |
return commit_creds(new); error: abort_creds(new); return retval; |
1da177e4c Linux-2.6.12-rc2 |
838 |
} |
dbf040d9d [CVE-2009-0029] S... |
839 |
SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid) |
1da177e4c Linux-2.6.12-rc2 |
840 |
{ |
86a264abe CRED: Wrap curren... |
841 |
const struct cred *cred = current_cred(); |
1da177e4c Linux-2.6.12-rc2 |
842 |
int retval; |
86a264abe CRED: Wrap curren... |
843 844 |
if (!(retval = put_user(cred->gid, rgid)) && !(retval = put_user(cred->egid, egid))) |
b6dff3ec5 CRED: Separate ta... |
845 |
retval = put_user(cred->sgid, sgid); |
1da177e4c Linux-2.6.12-rc2 |
846 847 848 849 850 851 852 853 854 855 856 |
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.. */ |
ae1251ab7 [CVE-2009-0029] S... |
857 |
SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4c Linux-2.6.12-rc2 |
858 |
{ |
d84f4f992 CRED: Inaugurate ... |
859 860 861 |
const struct cred *old; struct cred *new; uid_t old_fsuid; |
1da177e4c Linux-2.6.12-rc2 |
862 |
|
d84f4f992 CRED: Inaugurate ... |
863 864 865 866 867 |
new = prepare_creds(); if (!new) return current_fsuid(); old = current_cred(); old_fsuid = old->fsuid; |
1da177e4c Linux-2.6.12-rc2 |
868 |
|
d84f4f992 CRED: Inaugurate ... |
869 870 |
if (uid == old->uid || uid == old->euid || uid == old->suid || uid == old->fsuid || |
fc832ad36 userns: user name... |
871 |
nsown_capable(CAP_SETUID)) { |
756184b7d [PATCH] CodingSty... |
872 |
if (uid != old_fsuid) { |
d84f4f992 CRED: Inaugurate ... |
873 874 875 |
new->fsuid = uid; if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) goto change_okay; |
1da177e4c Linux-2.6.12-rc2 |
876 |
} |
1da177e4c Linux-2.6.12-rc2 |
877 |
} |
d84f4f992 CRED: Inaugurate ... |
878 879 |
abort_creds(new); return old_fsuid; |
1da177e4c Linux-2.6.12-rc2 |
880 |
|
d84f4f992 CRED: Inaugurate ... |
881 882 |
change_okay: commit_creds(new); |
1da177e4c Linux-2.6.12-rc2 |
883 884 885 886 |
return old_fsuid; } /* |
f42df9e65 general: convert ... |
887 |
* Samma på svenska.. |
1da177e4c Linux-2.6.12-rc2 |
888 |
*/ |
ae1251ab7 [CVE-2009-0029] S... |
889 |
SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4c Linux-2.6.12-rc2 |
890 |
{ |
d84f4f992 CRED: Inaugurate ... |
891 892 893 894 895 896 897 898 899 |
const struct cred *old; struct cred *new; gid_t old_fsgid; new = prepare_creds(); if (!new) return current_fsgid(); old = current_cred(); old_fsgid = old->fsgid; |
1da177e4c Linux-2.6.12-rc2 |
900 |
|
d84f4f992 CRED: Inaugurate ... |
901 902 |
if (gid == old->gid || gid == old->egid || gid == old->sgid || gid == old->fsgid || |
fc832ad36 userns: user name... |
903 |
nsown_capable(CAP_SETGID)) { |
756184b7d [PATCH] CodingSty... |
904 |
if (gid != old_fsgid) { |
d84f4f992 CRED: Inaugurate ... |
905 906 |
new->fsgid = gid; goto change_okay; |
1da177e4c Linux-2.6.12-rc2 |
907 |
} |
1da177e4c Linux-2.6.12-rc2 |
908 |
} |
d84f4f992 CRED: Inaugurate ... |
909 |
|
d84f4f992 CRED: Inaugurate ... |
910 911 912 913 914 |
abort_creds(new); return old_fsgid; change_okay: commit_creds(new); |
1da177e4c Linux-2.6.12-rc2 |
915 916 |
return old_fsgid; } |
f06febc96 timers: fix itime... |
917 918 |
void do_sys_times(struct tms *tms) { |
0cf55e1ec sched, cputime: I... |
919 |
cputime_t tgutime, tgstime, cutime, cstime; |
f06febc96 timers: fix itime... |
920 |
|
2b5fe6de5 thread_group_cput... |
921 |
spin_lock_irq(¤t->sighand->siglock); |
0cf55e1ec sched, cputime: I... |
922 |
thread_group_times(current, &tgutime, &tgstime); |
f06febc96 timers: fix itime... |
923 924 925 |
cutime = current->signal->cutime; cstime = current->signal->cstime; spin_unlock_irq(¤t->sighand->siglock); |
0cf55e1ec sched, cputime: I... |
926 927 |
tms->tms_utime = cputime_to_clock_t(tgutime); tms->tms_stime = cputime_to_clock_t(tgstime); |
f06febc96 timers: fix itime... |
928 929 930 |
tms->tms_cutime = cputime_to_clock_t(cutime); tms->tms_cstime = cputime_to_clock_t(cstime); } |
58fd3aa28 [CVE-2009-0029] S... |
931 |
SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4c Linux-2.6.12-rc2 |
932 |
{ |
1da177e4c Linux-2.6.12-rc2 |
933 934 |
if (tbuf) { struct tms tmp; |
f06febc96 timers: fix itime... |
935 936 |
do_sys_times(&tmp); |
1da177e4c Linux-2.6.12-rc2 |
937 938 939 |
if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) return -EFAULT; } |
e3d5a27d5 Allow times and t... |
940 |
force_successful_syscall_return(); |
1da177e4c Linux-2.6.12-rc2 |
941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 |
return (long) jiffies_64_to_clock_t(get_jiffies_64()); } /* * 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 * * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. * LBT 04.03.94 */ |
b290ebe2c [CVE-2009-0029] S... |
956 |
SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4c Linux-2.6.12-rc2 |
957 958 |
{ struct task_struct *p; |
ee0acf90d [PATCH] setpgid: ... |
959 |
struct task_struct *group_leader = current->group_leader; |
4e021306c sys_setpgid(): si... |
960 961 |
struct pid *pgrp; int err; |
1da177e4c Linux-2.6.12-rc2 |
962 963 |
if (!pid) |
b488893a3 pid namespaces: c... |
964 |
pid = task_pid_vnr(group_leader); |
1da177e4c Linux-2.6.12-rc2 |
965 966 967 968 |
if (!pgid) pgid = pid; if (pgid < 0) return -EINVAL; |
950eaaca6 pid: make setpgid... |
969 |
rcu_read_lock(); |
1da177e4c Linux-2.6.12-rc2 |
970 971 972 973 974 975 976 |
/* 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... |
977 |
p = find_task_by_vpid(pid); |
1da177e4c Linux-2.6.12-rc2 |
978 979 980 981 982 983 |
if (!p) goto out; err = -EINVAL; if (!thread_group_leader(p)) goto out; |
4e021306c sys_setpgid(): si... |
984 |
if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4c Linux-2.6.12-rc2 |
985 |
err = -EPERM; |
41487c65b [PATCH] pid: repl... |
986 |
if (task_session(p) != task_session(group_leader)) |
1da177e4c Linux-2.6.12-rc2 |
987 988 989 990 991 992 |
goto out; err = -EACCES; if (p->did_exec) goto out; } else { err = -ESRCH; |
ee0acf90d [PATCH] setpgid: ... |
993 |
if (p != group_leader) |
1da177e4c Linux-2.6.12-rc2 |
994 995 996 997 998 999 |
goto out; } err = -EPERM; if (p->signal->leader) goto out; |
4e021306c sys_setpgid(): si... |
1000 |
pgrp = task_pid(p); |
1da177e4c Linux-2.6.12-rc2 |
1001 |
if (pgid != pid) { |
b488893a3 pid namespaces: c... |
1002 |
struct task_struct *g; |
1da177e4c Linux-2.6.12-rc2 |
1003 |
|
4e021306c sys_setpgid(): si... |
1004 1005 |
pgrp = find_vpid(pgid); g = pid_task(pgrp, PIDTYPE_PGID); |
41487c65b [PATCH] pid: repl... |
1006 |
if (!g || task_session(g) != task_session(group_leader)) |
f020bc468 [PATCH] sys_setpg... |
1007 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1008 |
} |
1da177e4c Linux-2.6.12-rc2 |
1009 1010 1011 |
err = security_task_setpgid(p, pgid); if (err) goto out; |
1b0f7ffd0 pids: kill signal... |
1012 |
if (task_pgrp(p) != pgrp) |
83beaf3c6 pids: sys_setpgid... |
1013 |
change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4c Linux-2.6.12-rc2 |
1014 1015 1016 1017 1018 |
err = 0; out: /* All paths lead to here, thus we are safe. -DaveM */ write_unlock_irq(&tasklist_lock); |
950eaaca6 pid: make setpgid... |
1019 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1020 1021 |
return err; } |
dbf040d9d [CVE-2009-0029] S... |
1022 |
SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4c Linux-2.6.12-rc2 |
1023 |
{ |
12a3de0a9 pids: sys_getpgid... |
1024 1025 1026 1027 1028 |
struct task_struct *p; struct pid *grp; int retval; rcu_read_lock(); |
756184b7d [PATCH] CodingSty... |
1029 |
if (!pid) |
12a3de0a9 pids: sys_getpgid... |
1030 |
grp = task_pgrp(current); |
756184b7d [PATCH] CodingSty... |
1031 |
else { |
1da177e4c Linux-2.6.12-rc2 |
1032 |
retval = -ESRCH; |
12a3de0a9 pids: sys_getpgid... |
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 |
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 |
1043 |
} |
12a3de0a9 pids: sys_getpgid... |
1044 1045 1046 1047 |
retval = pid_vnr(grp); out: rcu_read_unlock(); return retval; |
1da177e4c Linux-2.6.12-rc2 |
1048 1049 1050 |
} #ifdef __ARCH_WANT_SYS_GETPGRP |
dbf040d9d [CVE-2009-0029] S... |
1051 |
SYSCALL_DEFINE0(getpgrp) |
1da177e4c Linux-2.6.12-rc2 |
1052 |
{ |
12a3de0a9 pids: sys_getpgid... |
1053 |
return sys_getpgid(0); |
1da177e4c Linux-2.6.12-rc2 |
1054 1055 1056 |
} #endif |
dbf040d9d [CVE-2009-0029] S... |
1057 |
SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4c Linux-2.6.12-rc2 |
1058 |
{ |
1dd768c08 pids: sys_getsid:... |
1059 1060 1061 1062 1063 |
struct task_struct *p; struct pid *sid; int retval; rcu_read_lock(); |
756184b7d [PATCH] CodingSty... |
1064 |
if (!pid) |
1dd768c08 pids: sys_getsid:... |
1065 |
sid = task_session(current); |
756184b7d [PATCH] CodingSty... |
1066 |
else { |
1da177e4c Linux-2.6.12-rc2 |
1067 |
retval = -ESRCH; |
1dd768c08 pids: sys_getsid:... |
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 |
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 |
1078 |
} |
1dd768c08 pids: sys_getsid:... |
1079 1080 1081 1082 |
retval = pid_vnr(sid); out: rcu_read_unlock(); return retval; |
1da177e4c Linux-2.6.12-rc2 |
1083 |
} |
b290ebe2c [CVE-2009-0029] S... |
1084 |
SYSCALL_DEFINE0(setsid) |
1da177e4c Linux-2.6.12-rc2 |
1085 |
{ |
e19f247a3 [PATCH] setpgid: ... |
1086 |
struct task_struct *group_leader = current->group_leader; |
e4cc0a9c8 fix setsid() for ... |
1087 1088 |
struct pid *sid = task_pid(group_leader); pid_t session = pid_vnr(sid); |
1da177e4c Linux-2.6.12-rc2 |
1089 |
int err = -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
1090 |
write_lock_irq(&tasklist_lock); |
390e2ff07 [PATCH] Make sets... |
1091 1092 1093 |
/* Fail if I am already a session leader */ if (group_leader->signal->leader) goto out; |
430c62312 start the global ... |
1094 1095 |
/* Fail if a process group id already exists that equals the * proposed session id. |
390e2ff07 [PATCH] Make sets... |
1096 |
*/ |
6806aac6d sys_setsid: remov... |
1097 |
if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4c Linux-2.6.12-rc2 |
1098 |
goto out; |
e19f247a3 [PATCH] setpgid: ... |
1099 |
group_leader->signal->leader = 1; |
8520d7c7f teach set_special... |
1100 |
__set_special_pids(sid); |
24ec839c4 [PATCH] tty: ->si... |
1101 |
|
9c9f4ded9 tty: Add a kref c... |
1102 |
proc_clear_tty(group_leader); |
24ec839c4 [PATCH] tty: ->si... |
1103 |
|
e4cc0a9c8 fix setsid() for ... |
1104 |
err = session; |
1da177e4c Linux-2.6.12-rc2 |
1105 1106 |
out: write_unlock_irq(&tasklist_lock); |
5091faa44 sched: Add 'autog... |
1107 |
if (err > 0) { |
0d0df599f connector: fix re... |
1108 |
proc_sid_connector(group_leader); |
5091faa44 sched: Add 'autog... |
1109 1110 |
sched_autogroup_create_attach(group_leader); } |
1da177e4c Linux-2.6.12-rc2 |
1111 1112 |
return err; } |
1da177e4c Linux-2.6.12-rc2 |
1113 |
DECLARE_RWSEM(uts_sem); |
e28cbf229 improve sys_newun... |
1114 1115 |
#ifdef COMPAT_UTS_MACHINE #define override_architecture(name) \ |
46da27664 kernel/sys.c: fix... |
1116 |
(personality(current->personality) == PER_LINUX32 && \ |
e28cbf229 improve sys_newun... |
1117 1118 1119 1120 1121 |
copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ sizeof(COMPAT_UTS_MACHINE))) #else #define override_architecture(name) 0 #endif |
be27425dc Add a personality... |
1122 1123 1124 1125 1126 1127 1128 |
/* * 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 */ static int override_release(char __user *release, int len) { int ret = 0; |
a84a79e4d Avoid using varia... |
1129 |
char buf[65]; |
be27425dc Add a personality... |
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 |
if (current->personality & UNAME26) { char *rest = UTS_RELEASE; int ndots = 0; unsigned v; while (*rest) { if (*rest == '.' && ++ndots >= 3) break; if (!isdigit(*rest) && *rest != '.') break; rest++; } v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40; snprintf(buf, len, "2.6.%u%s", v, rest); ret = copy_to_user(release, buf, len); } return ret; } |
e48fbb699 [CVE-2009-0029] S... |
1149 |
SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4c Linux-2.6.12-rc2 |
1150 1151 1152 1153 |
{ int errno = 0; down_read(&uts_sem); |
e9ff3990f [PATCH] namespace... |
1154 |
if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4c Linux-2.6.12-rc2 |
1155 1156 |
errno = -EFAULT; up_read(&uts_sem); |
e28cbf229 improve sys_newun... |
1157 |
|
be27425dc Add a personality... |
1158 1159 |
if (!errno && override_release(name->release, sizeof(name->release))) errno = -EFAULT; |
e28cbf229 improve sys_newun... |
1160 1161 |
if (!errno && override_architecture(name)) errno = -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
1162 1163 |
return errno; } |
5cacdb4ad Add generic sys_o... |
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 |
#ifdef __ARCH_WANT_SYS_OLD_UNAME /* * Old cruft */ SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) { int error = 0; if (!name) return -EFAULT; down_read(&uts_sem); if (copy_to_user(name, utsname(), sizeof(*name))) error = -EFAULT; up_read(&uts_sem); |
be27425dc Add a personality... |
1179 1180 |
if (!error && override_release(name->release, sizeof(name->release))) error = -EFAULT; |
5cacdb4ad Add generic sys_o... |
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 |
if (!error && override_architecture(name)) error = -EFAULT; return error; } SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) { int error; if (!name) return -EFAULT; if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) return -EFAULT; down_read(&uts_sem); error = __copy_to_user(&name->sysname, &utsname()->sysname, __OLD_UTS_LEN); error |= __put_user(0, name->sysname + __OLD_UTS_LEN); error |= __copy_to_user(&name->nodename, &utsname()->nodename, __OLD_UTS_LEN); error |= __put_user(0, name->nodename + __OLD_UTS_LEN); error |= __copy_to_user(&name->release, &utsname()->release, __OLD_UTS_LEN); error |= __put_user(0, name->release + __OLD_UTS_LEN); error |= __copy_to_user(&name->version, &utsname()->version, __OLD_UTS_LEN); error |= __put_user(0, name->version + __OLD_UTS_LEN); error |= __copy_to_user(&name->machine, &utsname()->machine, __OLD_UTS_LEN); error |= __put_user(0, name->machine + __OLD_UTS_LEN); up_read(&uts_sem); if (!error && override_architecture(name)) error = -EFAULT; |
be27425dc Add a personality... |
1215 1216 |
if (!error && override_release(name->release, sizeof(name->release))) error = -EFAULT; |
5cacdb4ad Add generic sys_o... |
1217 1218 1219 |
return error ? -EFAULT : 0; } #endif |
5a8a82b1d [CVE-2009-0029] S... |
1220 |
SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4c Linux-2.6.12-rc2 |
1221 1222 1223 |
{ int errno; char tmp[__NEW_UTS_LEN]; |
bb96a6f50 userns: allow set... |
1224 |
if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4c Linux-2.6.12-rc2 |
1225 |
return -EPERM; |
fc832ad36 userns: user name... |
1226 |
|
1da177e4c Linux-2.6.12-rc2 |
1227 1228 1229 1230 1231 |
if (len < 0 || len > __NEW_UTS_LEN) return -EINVAL; down_write(&uts_sem); errno = -EFAULT; if (!copy_from_user(tmp, name, len)) { |
9679e4dd6 kernel/sys.c: imp... |
1232 1233 1234 1235 |
struct new_utsname *u = utsname(); memcpy(u->nodename, tmp, len); memset(u->nodename + len, 0, sizeof(u->nodename) - len); |
1da177e4c Linux-2.6.12-rc2 |
1236 1237 |
errno = 0; } |
f1ecf0685 sysctl: add suppo... |
1238 |
uts_proc_notify(UTS_PROC_HOSTNAME); |
1da177e4c Linux-2.6.12-rc2 |
1239 1240 1241 1242 1243 |
up_write(&uts_sem); return errno; } #ifdef __ARCH_WANT_SYS_GETHOSTNAME |
5a8a82b1d [CVE-2009-0029] S... |
1244 |
SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4c Linux-2.6.12-rc2 |
1245 1246 |
{ int i, errno; |
9679e4dd6 kernel/sys.c: imp... |
1247 |
struct new_utsname *u; |
1da177e4c Linux-2.6.12-rc2 |
1248 1249 1250 1251 |
if (len < 0) return -EINVAL; down_read(&uts_sem); |
9679e4dd6 kernel/sys.c: imp... |
1252 1253 |
u = utsname(); i = 1 + strlen(u->nodename); |
1da177e4c Linux-2.6.12-rc2 |
1254 1255 1256 |
if (i > len) i = len; errno = 0; |
9679e4dd6 kernel/sys.c: imp... |
1257 |
if (copy_to_user(name, u->nodename, i)) |
1da177e4c Linux-2.6.12-rc2 |
1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 |
errno = -EFAULT; up_read(&uts_sem); return errno; } #endif /* * Only setdomainname; getdomainname can be implemented by calling * uname() */ |
5a8a82b1d [CVE-2009-0029] S... |
1269 |
SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4c Linux-2.6.12-rc2 |
1270 1271 1272 |
{ int errno; char tmp[__NEW_UTS_LEN]; |
fc832ad36 userns: user name... |
1273 |
if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4c Linux-2.6.12-rc2 |
1274 1275 1276 1277 1278 1279 1280 |
return -EPERM; if (len < 0 || len > __NEW_UTS_LEN) return -EINVAL; down_write(&uts_sem); errno = -EFAULT; if (!copy_from_user(tmp, name, len)) { |
9679e4dd6 kernel/sys.c: imp... |
1281 1282 1283 1284 |
struct new_utsname *u = utsname(); memcpy(u->domainname, tmp, len); memset(u->domainname + len, 0, sizeof(u->domainname) - len); |
1da177e4c Linux-2.6.12-rc2 |
1285 1286 |
errno = 0; } |
f1ecf0685 sysctl: add suppo... |
1287 |
uts_proc_notify(UTS_PROC_DOMAINNAME); |
1da177e4c Linux-2.6.12-rc2 |
1288 1289 1290 |
up_write(&uts_sem); return errno; } |
e48fbb699 [CVE-2009-0029] S... |
1291 |
SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4c Linux-2.6.12-rc2 |
1292 |
{ |
b95183453 rlimits: switch m... |
1293 1294 1295 1296 1297 1298 1299 1300 |
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 |
1301 1302 1303 1304 1305 1306 1307 1308 |
} #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT /* * Back compatibility for getrlimit. Needed for some apps. */ |
e48fbb699 [CVE-2009-0029] S... |
1309 1310 |
SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4c Linux-2.6.12-rc2 |
1311 1312 1313 1314 1315 1316 1317 1318 |
{ struct rlimit x; if (resource >= RLIM_NLIMITS) return -EINVAL; task_lock(current->group_leader); x = current->signal->rlim[resource]; task_unlock(current->group_leader); |
756184b7d [PATCH] CodingSty... |
1319 |
if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4c Linux-2.6.12-rc2 |
1320 |
x.rlim_cur = 0x7FFFFFFF; |
756184b7d [PATCH] CodingSty... |
1321 |
if (x.rlim_max > 0x7FFFFFFF) |
1da177e4c Linux-2.6.12-rc2 |
1322 1323 1324 1325 1326 |
x.rlim_max = 0x7FFFFFFF; return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; } #endif |
c022a0aca rlimits: implemen... |
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 1357 1358 |
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... |
1359 |
/* make sure you are allowed to change @tsk limits before calling this */ |
5b41535aa rlimits: redo do_... |
1360 1361 |
int do_prlimit(struct task_struct *tsk, unsigned int resource, struct rlimit *new_rlim, struct rlimit *old_rlim) |
1da177e4c Linux-2.6.12-rc2 |
1362 |
{ |
5b41535aa rlimits: redo do_... |
1363 |
struct rlimit *rlim; |
86f162f4c rlimits: do secur... |
1364 |
int retval = 0; |
1da177e4c Linux-2.6.12-rc2 |
1365 1366 1367 |
if (resource >= RLIM_NLIMITS) return -EINVAL; |
5b41535aa rlimits: redo do_... |
1368 1369 1370 1371 1372 1373 1374 |
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 |
1375 |
|
1c1e618dd rlimits: allow se... |
1376 1377 1378 1379 1380 1381 |
/* protect tsk->signal and tsk->sighand from disappearing */ read_lock(&tasklist_lock); if (!tsk->sighand) { retval = -ESRCH; goto out; } |
5b41535aa rlimits: redo do_... |
1382 |
rlim = tsk->signal->rlim + resource; |
86f162f4c rlimits: do secur... |
1383 |
task_lock(tsk->group_leader); |
5b41535aa rlimits: redo do_... |
1384 |
if (new_rlim) { |
fc832ad36 userns: user name... |
1385 1386 |
/* Keep the capable check against init_user_ns until cgroups can contain all limits */ |
5b41535aa rlimits: redo do_... |
1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 |
if (new_rlim->rlim_max > rlim->rlim_max && !capable(CAP_SYS_RESOURCE)) retval = -EPERM; if (!retval) retval = security_task_setrlimit(tsk->group_leader, resource, new_rlim); 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... |
1408 |
} |
7855c35da rlimits: split sy... |
1409 |
task_unlock(tsk->group_leader); |
1da177e4c Linux-2.6.12-rc2 |
1410 |
|
d3561f78f [PATCH] RLIMIT_CP... |
1411 1412 1413 1414 1415 1416 |
/* * 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_... |
1417 1418 1419 |
if (!retval && new_rlim && resource == RLIMIT_CPU && new_rlim->rlim_cur != RLIM_INFINITY) update_rlimit_cpu(tsk, new_rlim->rlim_cur); |
ec9e16bac [PATCH] sys_setrl... |
1420 |
out: |
1c1e618dd rlimits: allow se... |
1421 |
read_unlock(&tasklist_lock); |
2fb9d2689 rlimits: make sur... |
1422 |
return retval; |
1da177e4c Linux-2.6.12-rc2 |
1423 |
} |
c022a0aca rlimits: implemen... |
1424 1425 1426 1427 |
/* rcu lock must be held */ static int check_prlimit_permission(struct task_struct *task) { const struct cred *cred = current_cred(), *tcred; |
fc832ad36 userns: user name... |
1428 1429 |
if (current == task) return 0; |
c022a0aca rlimits: implemen... |
1430 |
|
fc832ad36 userns: user name... |
1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 |
tcred = __task_cred(task); if (cred->user->user_ns == tcred->user->user_ns && (cred->uid == tcred->euid && cred->uid == tcred->suid && cred->uid == tcred->uid && cred->gid == tcred->egid && cred->gid == tcred->sgid && cred->gid == tcred->gid)) return 0; if (ns_capable(tcred->user->user_ns, CAP_SYS_RESOURCE)) return 0; return -EPERM; |
c022a0aca rlimits: implemen... |
1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 |
} 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; int ret; if (new_rlim) { if (copy_from_user(&new64, new_rlim, sizeof(new64))) return -EFAULT; rlim64_to_rlim(&new64, &new); } rcu_read_lock(); tsk = pid ? find_task_by_vpid(pid) : current; if (!tsk) { rcu_read_unlock(); return -ESRCH; } ret = check_prlimit_permission(tsk); 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... |
1487 1488 1489 1490 1491 1492 |
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_... |
1493 |
return do_prlimit(current, resource, &new_rlim, NULL); |
7855c35da rlimits: split sy... |
1494 |
} |
1da177e4c Linux-2.6.12-rc2 |
1495 1496 1497 1498 1499 1500 1501 1502 |
/* * 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 |
1503 1504 1505 1506 1507 1508 1509 |
* 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... |
1510 |
* |
de047c1bc [PATCH] avoid tas... |
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 |
* 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... |
1525 |
* |
1da177e4c Linux-2.6.12-rc2 |
1526 |
*/ |
f06febc96 timers: fix itime... |
1527 |
static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4a add RUSAGE_THREAD |
1528 |
{ |
679c9cd4a add RUSAGE_THREAD |
1529 1530 1531 1532 1533 1534 1535 |
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); } |
1da177e4c Linux-2.6.12-rc2 |
1536 1537 1538 1539 |
static void k_getrusage(struct task_struct *p, int who, struct rusage *r) { struct task_struct *t; unsigned long flags; |
0cf55e1ec sched, cputime: I... |
1540 |
cputime_t tgutime, tgstime, utime, stime; |
1f10206cf getrusage: fill r... |
1541 |
unsigned long maxrss = 0; |
1da177e4c Linux-2.6.12-rc2 |
1542 1543 |
memset((char *) r, 0, sizeof *r); |
648616343 [S390] cputime: a... |
1544 |
utime = stime = 0; |
1da177e4c Linux-2.6.12-rc2 |
1545 |
|
679c9cd4a add RUSAGE_THREAD |
1546 |
if (who == RUSAGE_THREAD) { |
d180c5bcc sched: Introduce ... |
1547 |
task_times(current, &utime, &stime); |
f06febc96 timers: fix itime... |
1548 |
accumulate_thread_rusage(p, r); |
1f10206cf getrusage: fill r... |
1549 |
maxrss = p->signal->maxrss; |
679c9cd4a add RUSAGE_THREAD |
1550 1551 |
goto out; } |
d6cf723a1 k_getrusage: don'... |
1552 |
if (!lock_task_sighand(p, &flags)) |
de047c1bc [PATCH] avoid tas... |
1553 |
return; |
0f59cc4a3 [PATCH] simplify ... |
1554 |
|
1da177e4c Linux-2.6.12-rc2 |
1555 |
switch (who) { |
0f59cc4a3 [PATCH] simplify ... |
1556 |
case RUSAGE_BOTH: |
1da177e4c Linux-2.6.12-rc2 |
1557 |
case RUSAGE_CHILDREN: |
1da177e4c Linux-2.6.12-rc2 |
1558 1559 1560 1561 1562 1563 |
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; |
6eaeeaba3 getrusage(): fill... |
1564 1565 |
r->ru_inblock = p->signal->cinblock; r->ru_oublock = p->signal->coublock; |
1f10206cf getrusage: fill r... |
1566 |
maxrss = p->signal->cmaxrss; |
0f59cc4a3 [PATCH] simplify ... |
1567 1568 1569 |
if (who == RUSAGE_CHILDREN) break; |
1da177e4c Linux-2.6.12-rc2 |
1570 |
case RUSAGE_SELF: |
0cf55e1ec sched, cputime: I... |
1571 |
thread_group_times(p, &tgutime, &tgstime); |
648616343 [S390] cputime: a... |
1572 1573 |
utime += tgutime; stime += tgstime; |
1da177e4c Linux-2.6.12-rc2 |
1574 1575 1576 1577 |
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; |
6eaeeaba3 getrusage(): fill... |
1578 1579 |
r->ru_inblock += p->signal->inblock; r->ru_oublock += p->signal->oublock; |
1f10206cf getrusage: fill r... |
1580 1581 |
if (maxrss < p->signal->maxrss) maxrss = p->signal->maxrss; |
1da177e4c Linux-2.6.12-rc2 |
1582 1583 |
t = p; do { |
f06febc96 timers: fix itime... |
1584 |
accumulate_thread_rusage(t, r); |
1da177e4c Linux-2.6.12-rc2 |
1585 1586 |
t = next_thread(t); } while (t != p); |
1da177e4c Linux-2.6.12-rc2 |
1587 |
break; |
0f59cc4a3 [PATCH] simplify ... |
1588 |
|
1da177e4c Linux-2.6.12-rc2 |
1589 1590 1591 |
default: BUG(); } |
de047c1bc [PATCH] avoid tas... |
1592 |
unlock_task_sighand(p, &flags); |
de047c1bc [PATCH] avoid tas... |
1593 |
|
679c9cd4a add RUSAGE_THREAD |
1594 |
out: |
0f59cc4a3 [PATCH] simplify ... |
1595 1596 |
cputime_to_timeval(utime, &r->ru_utime); cputime_to_timeval(stime, &r->ru_stime); |
1f10206cf getrusage: fill r... |
1597 1598 1599 1600 1601 1602 1603 1604 1605 |
if (who != RUSAGE_CHILDREN) { struct mm_struct *mm = get_task_mm(p); 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 |
1606 1607 1608 1609 1610 |
} int getrusage(struct task_struct *p, int who, struct rusage __user *ru) { struct rusage r; |
1da177e4c Linux-2.6.12-rc2 |
1611 |
k_getrusage(p, who, &r); |
1da177e4c Linux-2.6.12-rc2 |
1612 1613 |
return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; } |
e48fbb699 [CVE-2009-0029] S... |
1614 |
SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4c Linux-2.6.12-rc2 |
1615 |
{ |
679c9cd4a add RUSAGE_THREAD |
1616 1617 |
if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && who != RUSAGE_THREAD) |
1da177e4c Linux-2.6.12-rc2 |
1618 1619 1620 |
return -EINVAL; return getrusage(current, who, ru); } |
e48fbb699 [CVE-2009-0029] S... |
1621 |
SYSCALL_DEFINE1(umask, int, mask) |
1da177e4c Linux-2.6.12-rc2 |
1622 1623 1624 1625 |
{ mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); return mask; } |
3b7391de6 capabilities: int... |
1626 |
|
028ee4be3 c/r: prctl: add P... |
1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 |
#ifdef CONFIG_CHECKPOINT_RESTORE static int prctl_set_mm(int opt, unsigned long addr, unsigned long arg4, unsigned long arg5) { unsigned long rlim = rlimit(RLIMIT_DATA); unsigned long vm_req_flags; unsigned long vm_bad_flags; struct vm_area_struct *vma; int error = 0; struct mm_struct *mm = current->mm; if (arg4 | arg5) return -EINVAL; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (addr >= TASK_SIZE) return -EINVAL; down_read(&mm->mmap_sem); vma = find_vma(mm, addr); if (opt != PR_SET_MM_START_BRK && opt != PR_SET_MM_BRK) { /* It must be existing VMA */ if (!vma || vma->vm_start > addr) goto out; } error = -EINVAL; switch (opt) { case PR_SET_MM_START_CODE: case PR_SET_MM_END_CODE: vm_req_flags = VM_READ | VM_EXEC; vm_bad_flags = VM_WRITE | VM_MAYSHARE; if ((vma->vm_flags & vm_req_flags) != vm_req_flags || (vma->vm_flags & vm_bad_flags)) goto out; if (opt == PR_SET_MM_START_CODE) mm->start_code = addr; else mm->end_code = addr; break; case PR_SET_MM_START_DATA: case PR_SET_MM_END_DATA: vm_req_flags = VM_READ | VM_WRITE; vm_bad_flags = VM_EXEC | VM_MAYSHARE; if ((vma->vm_flags & vm_req_flags) != vm_req_flags || (vma->vm_flags & vm_bad_flags)) goto out; if (opt == PR_SET_MM_START_DATA) mm->start_data = addr; else mm->end_data = addr; break; case PR_SET_MM_START_STACK: #ifdef CONFIG_STACK_GROWSUP vm_req_flags = VM_READ | VM_WRITE | VM_GROWSUP; #else vm_req_flags = VM_READ | VM_WRITE | VM_GROWSDOWN; #endif if ((vma->vm_flags & vm_req_flags) != vm_req_flags) goto out; mm->start_stack = addr; break; case PR_SET_MM_START_BRK: if (addr <= mm->end_data) goto out; if (rlim < RLIM_INFINITY && (mm->brk - addr) + (mm->end_data - mm->start_data) > rlim) goto out; mm->start_brk = addr; break; case PR_SET_MM_BRK: if (addr <= mm->end_data) goto out; if (rlim < RLIM_INFINITY && (addr - mm->start_brk) + (mm->end_data - mm->start_data) > rlim) goto out; mm->brk = addr; break; default: error = -EINVAL; goto out; } error = 0; out: up_read(&mm->mmap_sem); return error; } #else /* CONFIG_CHECKPOINT_RESTORE */ static int prctl_set_mm(int opt, unsigned long addr, unsigned long arg4, unsigned long arg5) { return -EINVAL; } #endif |
c4ea37c26 [CVE-2009-0029] S... |
1744 1745 |
SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, unsigned long, arg4, unsigned long, arg5) |
1da177e4c Linux-2.6.12-rc2 |
1746 |
{ |
b6dff3ec5 CRED: Separate ta... |
1747 1748 1749 |
struct task_struct *me = current; unsigned char comm[sizeof(me->comm)]; long error; |
1da177e4c Linux-2.6.12-rc2 |
1750 |
|
d84f4f992 CRED: Inaugurate ... |
1751 1752 |
error = security_task_prctl(option, arg2, arg3, arg4, arg5); if (error != -ENOSYS) |
1da177e4c Linux-2.6.12-rc2 |
1753 |
return error; |
d84f4f992 CRED: Inaugurate ... |
1754 |
error = 0; |
1da177e4c Linux-2.6.12-rc2 |
1755 1756 |
switch (option) { case PR_SET_PDEATHSIG: |
0730ded5b [PATCH] remove a ... |
1757 |
if (!valid_signal(arg2)) { |
1da177e4c Linux-2.6.12-rc2 |
1758 1759 1760 |
error = -EINVAL; break; } |
b6dff3ec5 CRED: Separate ta... |
1761 1762 |
me->pdeath_signal = arg2; error = 0; |
1da177e4c Linux-2.6.12-rc2 |
1763 1764 |
break; case PR_GET_PDEATHSIG: |
b6dff3ec5 CRED: Separate ta... |
1765 |
error = put_user(me->pdeath_signal, (int __user *)arg2); |
1da177e4c Linux-2.6.12-rc2 |
1766 1767 |
break; case PR_GET_DUMPABLE: |
b6dff3ec5 CRED: Separate ta... |
1768 |
error = get_dumpable(me->mm); |
1da177e4c Linux-2.6.12-rc2 |
1769 1770 |
break; case PR_SET_DUMPABLE: |
abf75a503 [PATCH] Fix prctl... |
1771 |
if (arg2 < 0 || arg2 > 1) { |
1da177e4c Linux-2.6.12-rc2 |
1772 1773 1774 |
error = -EINVAL; break; } |
b6dff3ec5 CRED: Separate ta... |
1775 1776 |
set_dumpable(me->mm, arg2); error = 0; |
1da177e4c Linux-2.6.12-rc2 |
1777 1778 1779 |
break; case PR_SET_UNALIGN: |
b6dff3ec5 CRED: Separate ta... |
1780 |
error = SET_UNALIGN_CTL(me, arg2); |
1da177e4c Linux-2.6.12-rc2 |
1781 1782 |
break; case PR_GET_UNALIGN: |
b6dff3ec5 CRED: Separate ta... |
1783 |
error = GET_UNALIGN_CTL(me, arg2); |
1da177e4c Linux-2.6.12-rc2 |
1784 1785 |
break; case PR_SET_FPEMU: |
b6dff3ec5 CRED: Separate ta... |
1786 |
error = SET_FPEMU_CTL(me, arg2); |
1da177e4c Linux-2.6.12-rc2 |
1787 1788 |
break; case PR_GET_FPEMU: |
b6dff3ec5 CRED: Separate ta... |
1789 |
error = GET_FPEMU_CTL(me, arg2); |
1da177e4c Linux-2.6.12-rc2 |
1790 1791 |
break; case PR_SET_FPEXC: |
b6dff3ec5 CRED: Separate ta... |
1792 |
error = SET_FPEXC_CTL(me, arg2); |
1da177e4c Linux-2.6.12-rc2 |
1793 1794 |
break; case PR_GET_FPEXC: |
b6dff3ec5 CRED: Separate ta... |
1795 |
error = GET_FPEXC_CTL(me, arg2); |
1da177e4c Linux-2.6.12-rc2 |
1796 1797 1798 1799 1800 |
break; case PR_GET_TIMING: error = PR_TIMING_STATISTICAL; break; case PR_SET_TIMING: |
7b26655f6 sys_prctl(): fix ... |
1801 |
if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4c Linux-2.6.12-rc2 |
1802 |
error = -EINVAL; |
b6dff3ec5 CRED: Separate ta... |
1803 1804 |
else error = 0; |
1da177e4c Linux-2.6.12-rc2 |
1805 |
break; |
b6dff3ec5 CRED: Separate ta... |
1806 1807 1808 1809 |
case PR_SET_NAME: comm[sizeof(me->comm)-1] = 0; if (strncpy_from_user(comm, (char __user *)arg2, sizeof(me->comm) - 1) < 0) |
1da177e4c Linux-2.6.12-rc2 |
1810 |
return -EFAULT; |
b6dff3ec5 CRED: Separate ta... |
1811 |
set_task_comm(me, comm); |
f786ecba4 connector: add co... |
1812 |
proc_comm_connector(me); |
1da177e4c Linux-2.6.12-rc2 |
1813 |
return 0; |
b6dff3ec5 CRED: Separate ta... |
1814 1815 1816 1817 |
case PR_GET_NAME: get_task_comm(comm, me); if (copy_to_user((char __user *)arg2, comm, sizeof(comm))) |
1da177e4c Linux-2.6.12-rc2 |
1818 1819 |
return -EFAULT; return 0; |
651d765d0 [PATCH] Add a prc... |
1820 |
case PR_GET_ENDIAN: |
b6dff3ec5 CRED: Separate ta... |
1821 |
error = GET_ENDIAN(me, arg2); |
651d765d0 [PATCH] Add a prc... |
1822 1823 |
break; case PR_SET_ENDIAN: |
b6dff3ec5 CRED: Separate ta... |
1824 |
error = SET_ENDIAN(me, arg2); |
651d765d0 [PATCH] Add a prc... |
1825 |
break; |
1d9d02fee move seccomp from... |
1826 1827 1828 1829 1830 1831 |
case PR_GET_SECCOMP: error = prctl_get_seccomp(); break; case PR_SET_SECCOMP: error = prctl_set_seccomp(arg2); break; |
8fb402bcc generic, x86: add... |
1832 1833 1834 1835 1836 1837 |
case PR_GET_TSC: error = GET_TSC_CTL(arg2); break; case PR_SET_TSC: error = SET_TSC_CTL(arg2); break; |
cdd6c482c perf: Do the big ... |
1838 1839 |
case PR_TASK_PERF_EVENTS_DISABLE: error = perf_event_task_disable(); |
1d1c7ddbf perf counters: ad... |
1840 |
break; |
cdd6c482c perf: Do the big ... |
1841 1842 |
case PR_TASK_PERF_EVENTS_ENABLE: error = perf_event_task_enable(); |
1d1c7ddbf perf counters: ad... |
1843 |
break; |
6976675d9 hrtimer: create a... |
1844 1845 1846 1847 1848 1849 1850 1851 1852 |
case PR_GET_TIMERSLACK: error = current->timer_slack_ns; break; case PR_SET_TIMERSLACK: if (arg2 <= 0) current->timer_slack_ns = current->default_timer_slack_ns; else current->timer_slack_ns = arg2; |
b6dff3ec5 CRED: Separate ta... |
1853 |
error = 0; |
6976675d9 hrtimer: create a... |
1854 |
break; |
4db96cf07 HWPOISON: Add PR_... |
1855 1856 1857 1858 |
case PR_MCE_KILL: if (arg4 | arg5) return -EINVAL; switch (arg2) { |
1087e9b4f HWPOISON: Clean u... |
1859 |
case PR_MCE_KILL_CLEAR: |
4db96cf07 HWPOISON: Add PR_... |
1860 1861 1862 1863 |
if (arg3 != 0) return -EINVAL; current->flags &= ~PF_MCE_PROCESS; break; |
1087e9b4f HWPOISON: Clean u... |
1864 |
case PR_MCE_KILL_SET: |
4db96cf07 HWPOISON: Add PR_... |
1865 |
current->flags |= PF_MCE_PROCESS; |
1087e9b4f HWPOISON: Clean u... |
1866 |
if (arg3 == PR_MCE_KILL_EARLY) |
4db96cf07 HWPOISON: Add PR_... |
1867 |
current->flags |= PF_MCE_EARLY; |
1087e9b4f HWPOISON: Clean u... |
1868 |
else if (arg3 == PR_MCE_KILL_LATE) |
4db96cf07 HWPOISON: Add PR_... |
1869 |
current->flags &= ~PF_MCE_EARLY; |
1087e9b4f HWPOISON: Clean u... |
1870 1871 1872 1873 1874 |
else if (arg3 == PR_MCE_KILL_DEFAULT) current->flags &= ~(PF_MCE_EARLY|PF_MCE_PROCESS); else return -EINVAL; |
4db96cf07 HWPOISON: Add PR_... |
1875 1876 1877 1878 1879 1880 |
break; default: return -EINVAL; } error = 0; break; |
1087e9b4f HWPOISON: Clean u... |
1881 1882 1883 1884 1885 1886 1887 1888 1889 |
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; |
028ee4be3 c/r: prctl: add P... |
1890 1891 1892 |
case PR_SET_MM: error = prctl_set_mm(arg2, arg3, arg4, arg5); break; |
1da177e4c Linux-2.6.12-rc2 |
1893 1894 1895 1896 1897 1898 |
default: error = -EINVAL; break; } return error; } |
3cfc348bf [PATCH] x86: Add ... |
1899 |
|
836f92adf [CVE-2009-0029] S... |
1900 1901 |
SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, struct getcpu_cache __user *, unused) |
3cfc348bf [PATCH] x86: Add ... |
1902 1903 1904 1905 1906 1907 1908 |
{ int err = 0; int cpu = raw_smp_processor_id(); if (cpup) err |= put_user(cpu, cpup); if (nodep) err |= put_user(cpu_to_node(cpu), nodep); |
3cfc348bf [PATCH] x86: Add ... |
1909 1910 |
return err ? -EFAULT : 0; } |
10a0a8d4e Add common orderl... |
1911 1912 |
char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; |
a06a4dc3a kmod: add init fu... |
1913 |
static void argv_cleanup(struct subprocess_info *info) |
10a0a8d4e Add common orderl... |
1914 |
{ |
a06a4dc3a kmod: add init fu... |
1915 |
argv_free(info->argv); |
10a0a8d4e Add common orderl... |
1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 |
} /** * orderly_poweroff - Trigger an orderly system poweroff * @force: force poweroff if command execution fails * * This may be called from any context to trigger a system shutdown. * If the orderly shutdown fails, it will force an immediate shutdown. */ int orderly_poweroff(bool force) { int argc; char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); static char *envp[] = { "HOME=/", "PATH=/sbin:/bin:/usr/sbin:/usr/bin", NULL }; int ret = -ENOMEM; struct subprocess_info *info; if (argv == NULL) { printk(KERN_WARNING "%s failed to allocate memory for \"%s\" ", __func__, poweroff_cmd); goto out; } |
ac331d158 call_usermodehelp... |
1943 |
info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4e Add common orderl... |
1944 1945 1946 1947 |
if (info == NULL) { argv_free(argv); goto out; } |
a06a4dc3a kmod: add init fu... |
1948 |
call_usermodehelper_setfns(info, NULL, argv_cleanup, NULL); |
10a0a8d4e Add common orderl... |
1949 |
|
86313c488 usermodehelper: T... |
1950 |
ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4e Add common orderl... |
1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 |
out: if (ret && force) { printk(KERN_WARNING "Failed to start orderly shutdown: " "forcing the issue "); /* I guess this should try to kick off some daemon to sync and poweroff asap. Or not even bother syncing if we're doing an emergency shutdown? */ emergency_sync(); kernel_power_off(); } return ret; } EXPORT_SYMBOL_GPL(orderly_poweroff); |