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kernel/sys.c
42.4 KB
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/* * linux/kernel/sys.c * * Copyright (C) 1991, 1992 Linus Torvalds */ |
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#include <linux/module.h> #include <linux/mm.h> #include <linux/utsname.h> #include <linux/mman.h> #include <linux/smp_lock.h> #include <linux/notifier.h> #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/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/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 <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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static int set_one_prio(struct task_struct *p, int niceval, int error) { int no_nice; if (p->uid != current->euid && p->euid != current->euid && !capable(CAP_SYS_NICE)) { 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; } asmlinkage long sys_setpriority(int which, int who, int niceval) { struct task_struct *g, *p; struct user_struct *user; 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; 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: user = current->user; if (!who) who = current->uid; else if ((who != current->uid) && !(user = find_user(who))) goto out_unlock; /* No processes for this user */ do_each_thread(g, p) if (p->uid == who) error = set_one_prio(p, niceval, error); while_each_thread(g, p); if (who != current->uid) free_uid(user); /* For find_user() */ break; } out_unlock: read_unlock(&tasklist_lock); 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. */ asmlinkage long sys_getpriority(int which, int who) { struct task_struct *g, *p; struct user_struct *user; 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; 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: user = current->user; if (!who) who = current->uid; else if ((who != current->uid) && !(user = find_user(who))) goto out_unlock; /* No processes for this user */ do_each_thread(g, p) if (p->uid == who) { niceval = 20 - task_nice(p); if (niceval > retval) retval = niceval; } while_each_thread(g, p); if (who != current->uid) free_uid(user); /* for find_user() */ break; } out_unlock: read_unlock(&tasklist_lock); 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) { 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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device_shutdown(); |
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sysdev_shutdown(); |
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} |
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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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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; 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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sysdev_shutdown(); |
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printk(KERN_EMERG "System halted. "); 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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sysdev_shutdown(); |
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printk(KERN_EMERG "Power down. "); machine_power_off(); } EXPORT_SYMBOL_GPL(kernel_power_off); |
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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. */ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user * arg) { char buffer[256]; /* 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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lock_kernel(); 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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unlock_kernel(); do_exit(0); break; case LINUX_REBOOT_CMD_POWER_OFF: |
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kernel_power_off(); |
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unlock_kernel(); do_exit(0); break; case LINUX_REBOOT_CMD_RESTART2: if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { unlock_kernel(); return -EFAULT; } buffer[sizeof(buffer) - 1] = '\0'; |
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kernel_restart(buffer); |
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break; |
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#ifdef CONFIG_KEXEC |
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case LINUX_REBOOT_CMD_KEXEC: |
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{ int ret; ret = kernel_kexec(); unlock_kernel(); return ret; } #endif |
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|
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#ifdef CONFIG_HIBERNATION |
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case LINUX_REBOOT_CMD_SW_SUSPEND: { |
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int ret = hibernate(); |
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unlock_kernel(); return ret; } #endif default: unlock_kernel(); return -EINVAL; } unlock_kernel(); return 0; } |
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static void deferred_cad(struct work_struct *dummy) |
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{ |
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kernel_restart(NULL); |
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} /* * 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) { |
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static DECLARE_WORK(cad_work, deferred_cad); |
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if (C_A_D) schedule_work(&cad_work); else |
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kill_cad_pid(SIGINT, 1); |
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} |
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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 * 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). */ asmlinkage long sys_setregid(gid_t rgid, gid_t egid) { int old_rgid = current->gid; int old_egid = current->egid; int new_rgid = old_rgid; int new_egid = old_egid; int retval; retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); if (retval) return retval; if (rgid != (gid_t) -1) { if ((old_rgid == rgid) || (current->egid==rgid) || capable(CAP_SETGID)) new_rgid = rgid; else return -EPERM; } if (egid != (gid_t) -1) { if ((old_rgid == egid) || (current->egid == egid) || (current->sgid == egid) || capable(CAP_SETGID)) new_egid = egid; |
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else |
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return -EPERM; |
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} |
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if (new_egid != old_egid) { |
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set_dumpable(current->mm, suid_dumpable); |
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smp_wmb(); |
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} if (rgid != (gid_t) -1 || (egid != (gid_t) -1 && egid != old_rgid)) current->sgid = new_egid; current->fsgid = new_egid; current->egid = new_egid; current->gid = new_rgid; key_fsgid_changed(current); |
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proc_id_connector(current, PROC_EVENT_GID); |
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return 0; } /* * setgid() is implemented like SysV w/ SAVED_IDS * * SMP: Same implicit races as above. */ asmlinkage long sys_setgid(gid_t gid) { int old_egid = current->egid; int retval; retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); if (retval) return retval; |
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if (capable(CAP_SETGID)) { if (old_egid != gid) { |
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set_dumpable(current->mm, suid_dumpable); |
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smp_wmb(); |
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} current->gid = current->egid = current->sgid = current->fsgid = gid; |
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} else if ((gid == current->gid) || (gid == current->sgid)) { if (old_egid != gid) { |
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set_dumpable(current->mm, suid_dumpable); |
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smp_wmb(); |
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} current->egid = current->fsgid = gid; } else return -EPERM; key_fsgid_changed(current); |
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proc_id_connector(current, PROC_EVENT_GID); |
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return 0; } static int set_user(uid_t new_ruid, int dumpclear) { struct user_struct *new_user; |
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new_user = alloc_uid(current->nsproxy->user_ns, new_ruid); |
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if (!new_user) return -EAGAIN; if (atomic_read(&new_user->processes) >= current->signal->rlim[RLIMIT_NPROC].rlim_cur && |
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new_user != current->nsproxy->user_ns->root_user) { |
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free_uid(new_user); return -EAGAIN; } switch_uid(new_user); |
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if (dumpclear) { |
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set_dumpable(current->mm, suid_dumpable); |
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562 |
smp_wmb(); |
1da177e4c Linux-2.6.12-rc2 |
563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 |
} current->uid = new_ruid; 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. */ asmlinkage long sys_setreuid(uid_t ruid, uid_t euid) { int old_ruid, old_euid, old_suid, new_ruid, new_euid; int retval; retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); if (retval) return retval; new_ruid = old_ruid = current->uid; new_euid = old_euid = current->euid; old_suid = current->suid; if (ruid != (uid_t) -1) { new_ruid = ruid; if ((old_ruid != ruid) && (current->euid != ruid) && !capable(CAP_SETUID)) return -EPERM; } if (euid != (uid_t) -1) { new_euid = euid; if ((old_ruid != euid) && (current->euid != euid) && (current->suid != euid) && !capable(CAP_SETUID)) return -EPERM; } if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0) return -EAGAIN; |
756184b7d [PATCH] CodingSty... |
615 |
if (new_euid != old_euid) { |
6c5d52382 coredump masking:... |
616 |
set_dumpable(current->mm, suid_dumpable); |
d59dd4620 [PATCH] use smp_m... |
617 |
smp_wmb(); |
1da177e4c Linux-2.6.12-rc2 |
618 619 620 621 622 623 624 625 |
} current->fsuid = current->euid = new_euid; if (ruid != (uid_t) -1 || (euid != (uid_t) -1 && euid != old_ruid)) current->suid = current->euid; current->fsuid = current->euid; key_fsuid_changed(current); |
9f46080c4 [PATCH] Process E... |
626 |
proc_id_connector(current, PROC_EVENT_UID); |
1da177e4c Linux-2.6.12-rc2 |
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 |
return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE); } /* * 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. */ asmlinkage long sys_setuid(uid_t uid) { int old_euid = current->euid; |
a09c17a6f [PATCH] sys: remo... |
647 |
int old_ruid, old_suid, new_suid; |
1da177e4c Linux-2.6.12-rc2 |
648 649 650 651 652 |
int retval; retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); if (retval) return retval; |
a09c17a6f [PATCH] sys: remo... |
653 |
old_ruid = current->uid; |
1da177e4c Linux-2.6.12-rc2 |
654 655 656 657 658 659 660 661 662 |
old_suid = current->suid; new_suid = old_suid; if (capable(CAP_SETUID)) { if (uid != old_ruid && set_user(uid, old_euid != uid) < 0) return -EAGAIN; new_suid = uid; } else if ((uid != current->uid) && (uid != new_suid)) return -EPERM; |
756184b7d [PATCH] CodingSty... |
663 |
if (old_euid != uid) { |
6c5d52382 coredump masking:... |
664 |
set_dumpable(current->mm, suid_dumpable); |
d59dd4620 [PATCH] use smp_m... |
665 |
smp_wmb(); |
1da177e4c Linux-2.6.12-rc2 |
666 667 668 669 670 |
} current->fsuid = current->euid = uid; current->suid = new_suid; key_fsuid_changed(current); |
9f46080c4 [PATCH] Process E... |
671 |
proc_id_connector(current, PROC_EVENT_UID); |
1da177e4c Linux-2.6.12-rc2 |
672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 |
return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID); } /* * This function implements a generic ability to update ruid, euid, * and suid. This allows you to implement the 4.4 compatible seteuid(). */ asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) { int old_ruid = current->uid; int old_euid = current->euid; int old_suid = current->suid; int retval; retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); if (retval) return retval; if (!capable(CAP_SETUID)) { if ((ruid != (uid_t) -1) && (ruid != current->uid) && (ruid != current->euid) && (ruid != current->suid)) return -EPERM; if ((euid != (uid_t) -1) && (euid != current->uid) && (euid != current->euid) && (euid != current->suid)) return -EPERM; if ((suid != (uid_t) -1) && (suid != current->uid) && (suid != current->euid) && (suid != current->suid)) return -EPERM; } if (ruid != (uid_t) -1) { if (ruid != current->uid && set_user(ruid, euid != current->euid) < 0) return -EAGAIN; } if (euid != (uid_t) -1) { |
756184b7d [PATCH] CodingSty... |
708 |
if (euid != current->euid) { |
6c5d52382 coredump masking:... |
709 |
set_dumpable(current->mm, suid_dumpable); |
d59dd4620 [PATCH] use smp_m... |
710 |
smp_wmb(); |
1da177e4c Linux-2.6.12-rc2 |
711 712 713 714 715 716 717 718 |
} current->euid = euid; } current->fsuid = current->euid; if (suid != (uid_t) -1) current->suid = suid; key_fsuid_changed(current); |
9f46080c4 [PATCH] Process E... |
719 |
proc_id_connector(current, PROC_EVENT_UID); |
1da177e4c Linux-2.6.12-rc2 |
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 |
return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES); } asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid) { int retval; if (!(retval = put_user(current->uid, ruid)) && !(retval = put_user(current->euid, euid))) retval = put_user(current->suid, suid); return retval; } /* * Same as above, but for rgid, egid, sgid. */ asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid) { int retval; retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); if (retval) return retval; if (!capable(CAP_SETGID)) { if ((rgid != (gid_t) -1) && (rgid != current->gid) && (rgid != current->egid) && (rgid != current->sgid)) return -EPERM; if ((egid != (gid_t) -1) && (egid != current->gid) && (egid != current->egid) && (egid != current->sgid)) return -EPERM; if ((sgid != (gid_t) -1) && (sgid != current->gid) && (sgid != current->egid) && (sgid != current->sgid)) return -EPERM; } if (egid != (gid_t) -1) { |
756184b7d [PATCH] CodingSty... |
758 |
if (egid != current->egid) { |
6c5d52382 coredump masking:... |
759 |
set_dumpable(current->mm, suid_dumpable); |
d59dd4620 [PATCH] use smp_m... |
760 |
smp_wmb(); |
1da177e4c Linux-2.6.12-rc2 |
761 762 763 764 765 766 767 768 769 770 |
} current->egid = egid; } current->fsgid = current->egid; if (rgid != (gid_t) -1) current->gid = rgid; if (sgid != (gid_t) -1) current->sgid = sgid; key_fsgid_changed(current); |
9f46080c4 [PATCH] Process E... |
771 |
proc_id_connector(current, PROC_EVENT_GID); |
1da177e4c Linux-2.6.12-rc2 |
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 |
return 0; } asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid) { int retval; if (!(retval = put_user(current->gid, rgid)) && !(retval = put_user(current->egid, egid))) retval = put_user(current->sgid, sgid); 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.. */ asmlinkage long sys_setfsuid(uid_t uid) { int old_fsuid; old_fsuid = current->fsuid; if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS)) return old_fsuid; if (uid == current->uid || uid == current->euid || uid == current->suid || uid == current->fsuid || |
756184b7d [PATCH] CodingSty... |
803 804 |
capable(CAP_SETUID)) { if (uid != old_fsuid) { |
6c5d52382 coredump masking:... |
805 |
set_dumpable(current->mm, suid_dumpable); |
d59dd4620 [PATCH] use smp_m... |
806 |
smp_wmb(); |
1da177e4c Linux-2.6.12-rc2 |
807 808 809 810 811 |
} current->fsuid = uid; } key_fsuid_changed(current); |
9f46080c4 [PATCH] Process E... |
812 |
proc_id_connector(current, PROC_EVENT_UID); |
1da177e4c Linux-2.6.12-rc2 |
813 814 815 816 817 818 819 |
security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS); return old_fsuid; } /* |
f42df9e65 general: convert ... |
820 |
* Samma på svenska.. |
1da177e4c Linux-2.6.12-rc2 |
821 822 823 824 825 826 827 828 829 830 831 |
*/ asmlinkage long sys_setfsgid(gid_t gid) { int old_fsgid; old_fsgid = current->fsgid; if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS)) return old_fsgid; if (gid == current->gid || gid == current->egid || gid == current->sgid || gid == current->fsgid || |
756184b7d [PATCH] CodingSty... |
832 833 |
capable(CAP_SETGID)) { if (gid != old_fsgid) { |
6c5d52382 coredump masking:... |
834 |
set_dumpable(current->mm, suid_dumpable); |
d59dd4620 [PATCH] use smp_m... |
835 |
smp_wmb(); |
1da177e4c Linux-2.6.12-rc2 |
836 837 838 |
} current->fsgid = gid; key_fsgid_changed(current); |
9f46080c4 [PATCH] Process E... |
839 |
proc_id_connector(current, PROC_EVENT_GID); |
1da177e4c Linux-2.6.12-rc2 |
840 841 842 843 844 845 846 847 848 849 850 851 852 853 |
} return old_fsgid; } asmlinkage long sys_times(struct tms __user * tbuf) { /* * In the SMP world we might just be unlucky and have one of * the times increment as we use it. Since the value is an * atomically safe type this is just fine. Conceptually its * as if the syscall took an instant longer to occur. */ if (tbuf) { struct tms tmp; |
35f5cad8c [PATCH] revert "O... |
854 855 |
struct task_struct *tsk = current; struct task_struct *t; |
1da177e4c Linux-2.6.12-rc2 |
856 |
cputime_t utime, stime, cutime, cstime; |
7d7185c81 [PATCH] sys_times... |
857 |
spin_lock_irq(&tsk->sighand->siglock); |
35f5cad8c [PATCH] revert "O... |
858 859 860 861 862 863 864 865 |
utime = tsk->signal->utime; stime = tsk->signal->stime; t = tsk; do { utime = cputime_add(utime, t->utime); stime = cputime_add(stime, t->stime); t = next_thread(t); } while (t != tsk); |
35f5cad8c [PATCH] revert "O... |
866 867 868 |
cutime = tsk->signal->cutime; cstime = tsk->signal->cstime; spin_unlock_irq(&tsk->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 |
tmp.tms_utime = cputime_to_clock_t(utime); tmp.tms_stime = cputime_to_clock_t(stime); tmp.tms_cutime = cputime_to_clock_t(cutime); tmp.tms_cstime = cputime_to_clock_t(cstime); if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) return -EFAULT; } 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 */ |
1da177e4c Linux-2.6.12-rc2 |
892 893 894 |
asmlinkage long sys_setpgid(pid_t pid, pid_t pgid) { struct task_struct *p; |
ee0acf90d [PATCH] setpgid: ... |
895 |
struct task_struct *group_leader = current->group_leader; |
4e021306c sys_setpgid(): si... |
896 897 |
struct pid *pgrp; int err; |
1da177e4c Linux-2.6.12-rc2 |
898 899 |
if (!pid) |
b488893a3 pid namespaces: c... |
900 |
pid = task_pid_vnr(group_leader); |
1da177e4c Linux-2.6.12-rc2 |
901 902 903 904 905 906 907 908 909 910 911 |
if (!pgid) pgid = pid; if (pgid < 0) return -EINVAL; /* 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... |
912 |
p = find_task_by_vpid(pid); |
1da177e4c Linux-2.6.12-rc2 |
913 914 915 916 917 918 |
if (!p) goto out; err = -EINVAL; if (!thread_group_leader(p)) goto out; |
4e021306c sys_setpgid(): si... |
919 |
if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4c Linux-2.6.12-rc2 |
920 |
err = -EPERM; |
41487c65b [PATCH] pid: repl... |
921 |
if (task_session(p) != task_session(group_leader)) |
1da177e4c Linux-2.6.12-rc2 |
922 923 924 925 926 927 |
goto out; err = -EACCES; if (p->did_exec) goto out; } else { err = -ESRCH; |
ee0acf90d [PATCH] setpgid: ... |
928 |
if (p != group_leader) |
1da177e4c Linux-2.6.12-rc2 |
929 930 931 932 933 934 |
goto out; } err = -EPERM; if (p->signal->leader) goto out; |
4e021306c sys_setpgid(): si... |
935 |
pgrp = task_pid(p); |
1da177e4c Linux-2.6.12-rc2 |
936 |
if (pgid != pid) { |
b488893a3 pid namespaces: c... |
937 |
struct task_struct *g; |
1da177e4c Linux-2.6.12-rc2 |
938 |
|
4e021306c sys_setpgid(): si... |
939 940 |
pgrp = find_vpid(pgid); g = pid_task(pgrp, PIDTYPE_PGID); |
41487c65b [PATCH] pid: repl... |
941 |
if (!g || task_session(g) != task_session(group_leader)) |
f020bc468 [PATCH] sys_setpg... |
942 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
943 |
} |
1da177e4c Linux-2.6.12-rc2 |
944 945 946 |
err = security_task_setpgid(p, pgid); if (err) goto out; |
4e021306c sys_setpgid(): si... |
947 |
if (task_pgrp(p) != pgrp) { |
83beaf3c6 pids: sys_setpgid... |
948 |
change_pid(p, PIDTYPE_PGID, pgrp); |
4e021306c sys_setpgid(): si... |
949 |
set_task_pgrp(p, pid_nr(pgrp)); |
1da177e4c Linux-2.6.12-rc2 |
950 951 952 953 954 955 956 957 958 959 960 |
} err = 0; out: /* All paths lead to here, thus we are safe. -DaveM */ write_unlock_irq(&tasklist_lock); return err; } asmlinkage long sys_getpgid(pid_t pid) { |
12a3de0a9 pids: sys_getpgid... |
961 962 963 964 965 |
struct task_struct *p; struct pid *grp; int retval; rcu_read_lock(); |
756184b7d [PATCH] CodingSty... |
966 |
if (!pid) |
12a3de0a9 pids: sys_getpgid... |
967 |
grp = task_pgrp(current); |
756184b7d [PATCH] CodingSty... |
968 |
else { |
1da177e4c Linux-2.6.12-rc2 |
969 |
retval = -ESRCH; |
12a3de0a9 pids: sys_getpgid... |
970 971 972 973 974 975 976 977 978 979 |
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 |
980 |
} |
12a3de0a9 pids: sys_getpgid... |
981 982 983 984 |
retval = pid_vnr(grp); out: rcu_read_unlock(); return retval; |
1da177e4c Linux-2.6.12-rc2 |
985 986 987 988 989 990 |
} #ifdef __ARCH_WANT_SYS_GETPGRP asmlinkage long sys_getpgrp(void) { |
12a3de0a9 pids: sys_getpgid... |
991 |
return sys_getpgid(0); |
1da177e4c Linux-2.6.12-rc2 |
992 993 994 995 996 997 |
} #endif asmlinkage long sys_getsid(pid_t pid) { |
1dd768c08 pids: sys_getsid:... |
998 999 1000 1001 1002 |
struct task_struct *p; struct pid *sid; int retval; rcu_read_lock(); |
756184b7d [PATCH] CodingSty... |
1003 |
if (!pid) |
1dd768c08 pids: sys_getsid:... |
1004 |
sid = task_session(current); |
756184b7d [PATCH] CodingSty... |
1005 |
else { |
1da177e4c Linux-2.6.12-rc2 |
1006 |
retval = -ESRCH; |
1dd768c08 pids: sys_getsid:... |
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 |
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 |
1017 |
} |
1dd768c08 pids: sys_getsid:... |
1018 1019 1020 1021 |
retval = pid_vnr(sid); out: rcu_read_unlock(); return retval; |
1da177e4c Linux-2.6.12-rc2 |
1022 1023 1024 1025 |
} asmlinkage long sys_setsid(void) { |
e19f247a3 [PATCH] setpgid: ... |
1026 |
struct task_struct *group_leader = current->group_leader; |
e4cc0a9c8 fix setsid() for ... |
1027 1028 |
struct pid *sid = task_pid(group_leader); pid_t session = pid_vnr(sid); |
1da177e4c Linux-2.6.12-rc2 |
1029 |
int err = -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
1030 |
write_lock_irq(&tasklist_lock); |
390e2ff07 [PATCH] Make sets... |
1031 1032 1033 |
/* Fail if I am already a session leader */ if (group_leader->signal->leader) goto out; |
430c62312 start the global ... |
1034 1035 |
/* Fail if a process group id already exists that equals the * proposed session id. |
390e2ff07 [PATCH] Make sets... |
1036 |
*/ |
6806aac6d sys_setsid: remov... |
1037 |
if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4c Linux-2.6.12-rc2 |
1038 |
goto out; |
e19f247a3 [PATCH] setpgid: ... |
1039 |
group_leader->signal->leader = 1; |
8520d7c7f teach set_special... |
1040 |
__set_special_pids(sid); |
24ec839c4 [PATCH] tty: ->si... |
1041 |
|
9c9f4ded9 tty: Add a kref c... |
1042 |
proc_clear_tty(group_leader); |
24ec839c4 [PATCH] tty: ->si... |
1043 |
|
e4cc0a9c8 fix setsid() for ... |
1044 |
err = session; |
1da177e4c Linux-2.6.12-rc2 |
1045 1046 |
out: write_unlock_irq(&tasklist_lock); |
1da177e4c Linux-2.6.12-rc2 |
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 |
return err; } /* * Supplementary group IDs */ /* init to 2 - one for init_task, one to ensure it is never freed */ struct group_info init_groups = { .usage = ATOMIC_INIT(2) }; struct group_info *groups_alloc(int gidsetsize) { struct group_info *group_info; int nblocks; int i; nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK; /* Make sure we always allocate at least one indirect block pointer */ nblocks = nblocks ? : 1; group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER); if (!group_info) return NULL; group_info->ngroups = gidsetsize; group_info->nblocks = nblocks; atomic_set(&group_info->usage, 1); |
756184b7d [PATCH] CodingSty... |
1072 |
if (gidsetsize <= NGROUPS_SMALL) |
1da177e4c Linux-2.6.12-rc2 |
1073 |
group_info->blocks[0] = group_info->small_block; |
756184b7d [PATCH] CodingSty... |
1074 |
else { |
1da177e4c Linux-2.6.12-rc2 |
1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 |
for (i = 0; i < nblocks; i++) { gid_t *b; b = (void *)__get_free_page(GFP_USER); if (!b) goto out_undo_partial_alloc; group_info->blocks[i] = b; } } return group_info; out_undo_partial_alloc: while (--i >= 0) { free_page((unsigned long)group_info->blocks[i]); } kfree(group_info); return NULL; } EXPORT_SYMBOL(groups_alloc); void groups_free(struct group_info *group_info) { if (group_info->blocks[0] != group_info->small_block) { int i; for (i = 0; i < group_info->nblocks; i++) free_page((unsigned long)group_info->blocks[i]); } kfree(group_info); } EXPORT_SYMBOL(groups_free); /* export the group_info to a user-space array */ static int groups_to_user(gid_t __user *grouplist, struct group_info *group_info) { int i; |
1bf47346d kernel/sys.c: get... |
1112 |
unsigned int count = group_info->ngroups; |
1da177e4c Linux-2.6.12-rc2 |
1113 1114 |
for (i = 0; i < group_info->nblocks; i++) { |
1bf47346d kernel/sys.c: get... |
1115 1116 |
unsigned int cp_count = min(NGROUPS_PER_BLOCK, count); unsigned int len = cp_count * sizeof(*grouplist); |
1da177e4c Linux-2.6.12-rc2 |
1117 |
|
1bf47346d kernel/sys.c: get... |
1118 |
if (copy_to_user(grouplist, group_info->blocks[i], len)) |
1da177e4c Linux-2.6.12-rc2 |
1119 |
return -EFAULT; |
1bf47346d kernel/sys.c: get... |
1120 |
grouplist += NGROUPS_PER_BLOCK; |
1da177e4c Linux-2.6.12-rc2 |
1121 1122 1123 1124 1125 1126 1127 1128 |
count -= cp_count; } return 0; } /* fill a group_info from a user-space array - it must be allocated already */ static int groups_from_user(struct group_info *group_info, gid_t __user *grouplist) |
756184b7d [PATCH] CodingSty... |
1129 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1130 |
int i; |
1bf47346d kernel/sys.c: get... |
1131 |
unsigned int count = group_info->ngroups; |
1da177e4c Linux-2.6.12-rc2 |
1132 1133 |
for (i = 0; i < group_info->nblocks; i++) { |
1bf47346d kernel/sys.c: get... |
1134 1135 |
unsigned int cp_count = min(NGROUPS_PER_BLOCK, count); unsigned int len = cp_count * sizeof(*grouplist); |
1da177e4c Linux-2.6.12-rc2 |
1136 |
|
1bf47346d kernel/sys.c: get... |
1137 |
if (copy_from_user(group_info->blocks[i], grouplist, len)) |
1da177e4c Linux-2.6.12-rc2 |
1138 |
return -EFAULT; |
1bf47346d kernel/sys.c: get... |
1139 |
grouplist += NGROUPS_PER_BLOCK; |
1da177e4c Linux-2.6.12-rc2 |
1140 1141 1142 1143 |
count -= cp_count; } return 0; } |
ebe8b5413 [PATCH] correctly... |
1144 |
/* a simple Shell sort */ |
1da177e4c Linux-2.6.12-rc2 |
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 |
static void groups_sort(struct group_info *group_info) { int base, max, stride; int gidsetsize = group_info->ngroups; for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1) ; /* nothing */ stride /= 3; while (stride) { max = gidsetsize - stride; for (base = 0; base < max; base++) { int left = base; int right = left + stride; gid_t tmp = GROUP_AT(group_info, right); while (left >= 0 && GROUP_AT(group_info, left) > tmp) { GROUP_AT(group_info, right) = GROUP_AT(group_info, left); right = left; left -= stride; } GROUP_AT(group_info, right) = tmp; } stride /= 3; } } /* a simple bsearch */ |
3e30148c3 [PATCH] Keys: Mak... |
1174 |
int groups_search(struct group_info *group_info, gid_t grp) |
1da177e4c Linux-2.6.12-rc2 |
1175 |
{ |
d74beb9f3 [PATCH] Use unsig... |
1176 |
unsigned int left, right; |
1da177e4c Linux-2.6.12-rc2 |
1177 1178 1179 1180 1181 1182 1183 |
if (!group_info) return 0; left = 0; right = group_info->ngroups; while (left < right) { |
d74beb9f3 [PATCH] Use unsig... |
1184 |
unsigned int mid = (left+right)/2; |
1da177e4c Linux-2.6.12-rc2 |
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 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 |
int cmp = grp - GROUP_AT(group_info, mid); if (cmp > 0) left = mid + 1; else if (cmp < 0) right = mid; else return 1; } return 0; } /* validate and set current->group_info */ int set_current_groups(struct group_info *group_info) { int retval; struct group_info *old_info; retval = security_task_setgroups(group_info); if (retval) return retval; groups_sort(group_info); get_group_info(group_info); task_lock(current); old_info = current->group_info; current->group_info = group_info; task_unlock(current); put_group_info(old_info); return 0; } EXPORT_SYMBOL(set_current_groups); asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist) { int i = 0; /* * SMP: Nobody else can change our grouplist. Thus we are * safe. */ if (gidsetsize < 0) return -EINVAL; /* no need to grab task_lock here; it cannot change */ |
1da177e4c Linux-2.6.12-rc2 |
1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 |
i = current->group_info->ngroups; if (gidsetsize) { if (i > gidsetsize) { i = -EINVAL; goto out; } if (groups_to_user(grouplist, current->group_info)) { i = -EFAULT; goto out; } } out: |
1da177e4c Linux-2.6.12-rc2 |
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 |
return i; } /* * SMP: Our groups are copy-on-write. We can set them safely * without another task interfering. */ asmlinkage long sys_setgroups(int gidsetsize, gid_t __user *grouplist) { struct group_info *group_info; int retval; if (!capable(CAP_SETGID)) return -EPERM; if ((unsigned)gidsetsize > NGROUPS_MAX) return -EINVAL; group_info = groups_alloc(gidsetsize); if (!group_info) return -ENOMEM; retval = groups_from_user(group_info, grouplist); if (retval) { put_group_info(group_info); return retval; } retval = set_current_groups(group_info); put_group_info(group_info); return retval; } /* * Check whether we're fsgid/egid or in the supplemental group.. */ int in_group_p(gid_t grp) { int retval = 1; |
756184b7d [PATCH] CodingSty... |
1285 |
if (grp != current->fsgid) |
1da177e4c Linux-2.6.12-rc2 |
1286 |
retval = groups_search(current->group_info, grp); |
1da177e4c Linux-2.6.12-rc2 |
1287 1288 1289 1290 1291 1292 1293 1294 |
return retval; } EXPORT_SYMBOL(in_group_p); int in_egroup_p(gid_t grp) { int retval = 1; |
756184b7d [PATCH] CodingSty... |
1295 |
if (grp != current->egid) |
1da177e4c Linux-2.6.12-rc2 |
1296 |
retval = groups_search(current->group_info, grp); |
1da177e4c Linux-2.6.12-rc2 |
1297 1298 1299 1300 1301 1302 |
return retval; } EXPORT_SYMBOL(in_egroup_p); DECLARE_RWSEM(uts_sem); |
1da177e4c Linux-2.6.12-rc2 |
1303 1304 1305 1306 1307 |
asmlinkage long sys_newuname(struct new_utsname __user * name) { int errno = 0; down_read(&uts_sem); |
e9ff3990f [PATCH] namespace... |
1308 |
if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4c Linux-2.6.12-rc2 |
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 |
errno = -EFAULT; up_read(&uts_sem); return errno; } asmlinkage long sys_sethostname(char __user *name, int len) { int errno; char tmp[__NEW_UTS_LEN]; if (!capable(CAP_SYS_ADMIN)) 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... |
1326 1327 1328 1329 |
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 |
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 |
errno = 0; } up_write(&uts_sem); return errno; } #ifdef __ARCH_WANT_SYS_GETHOSTNAME asmlinkage long sys_gethostname(char __user *name, int len) { int i, errno; |
9679e4dd6 kernel/sys.c: imp... |
1341 |
struct new_utsname *u; |
1da177e4c Linux-2.6.12-rc2 |
1342 1343 1344 1345 |
if (len < 0) return -EINVAL; down_read(&uts_sem); |
9679e4dd6 kernel/sys.c: imp... |
1346 1347 |
u = utsname(); i = 1 + strlen(u->nodename); |
1da177e4c Linux-2.6.12-rc2 |
1348 1349 1350 |
if (i > len) i = len; errno = 0; |
9679e4dd6 kernel/sys.c: imp... |
1351 |
if (copy_to_user(name, u->nodename, i)) |
1da177e4c Linux-2.6.12-rc2 |
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 |
errno = -EFAULT; up_read(&uts_sem); return errno; } #endif /* * Only setdomainname; getdomainname can be implemented by calling * uname() */ asmlinkage long sys_setdomainname(char __user *name, int len) { int errno; char tmp[__NEW_UTS_LEN]; if (!capable(CAP_SYS_ADMIN)) 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... |
1376 1377 1378 1379 |
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 |
1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 |
errno = 0; } up_write(&uts_sem); return errno; } asmlinkage long sys_getrlimit(unsigned int resource, struct rlimit __user *rlim) { if (resource >= RLIM_NLIMITS) return -EINVAL; else { struct rlimit value; task_lock(current->group_leader); value = current->signal->rlim[resource]; task_unlock(current->group_leader); return copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; } } #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT /* * Back compatibility for getrlimit. Needed for some apps. */ asmlinkage long sys_old_getrlimit(unsigned int resource, struct rlimit __user *rlim) { 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... |
1414 |
if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4c Linux-2.6.12-rc2 |
1415 |
x.rlim_cur = 0x7FFFFFFF; |
756184b7d [PATCH] CodingSty... |
1416 |
if (x.rlim_max > 0x7FFFFFFF) |
1da177e4c Linux-2.6.12-rc2 |
1417 1418 1419 1420 1421 1422 1423 1424 1425 |
x.rlim_max = 0x7FFFFFFF; return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; } #endif asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim) { struct rlimit new_rlim, *old_rlim; |
ec9e16bac [PATCH] sys_setrl... |
1426 |
unsigned long it_prof_secs; |
1da177e4c Linux-2.6.12-rc2 |
1427 1428 1429 1430 |
int retval; if (resource >= RLIM_NLIMITS) return -EINVAL; |
ec9e16bac [PATCH] sys_setrl... |
1431 |
if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
1da177e4c Linux-2.6.12-rc2 |
1432 |
return -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
1433 1434 1435 1436 |
old_rlim = current->signal->rlim + resource; if ((new_rlim.rlim_max > old_rlim->rlim_max) && !capable(CAP_SYS_RESOURCE)) return -EPERM; |
0c2d64fb6 rlimit: permit se... |
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 |
if (resource == RLIMIT_NOFILE) { if (new_rlim.rlim_max == RLIM_INFINITY) new_rlim.rlim_max = sysctl_nr_open; if (new_rlim.rlim_cur == RLIM_INFINITY) new_rlim.rlim_cur = sysctl_nr_open; if (new_rlim.rlim_max > sysctl_nr_open) return -EPERM; } if (new_rlim.rlim_cur > new_rlim.rlim_max) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1449 1450 1451 1452 |
retval = security_task_setrlimit(resource, &new_rlim); if (retval) return retval; |
9926e4c74 CPU time limit pa... |
1453 1454 1455 1456 1457 1458 1459 1460 1461 |
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; } |
1da177e4c Linux-2.6.12-rc2 |
1462 1463 1464 |
task_lock(current->group_leader); *old_rlim = new_rlim; task_unlock(current->group_leader); |
ec9e16bac [PATCH] sys_setrl... |
1465 1466 |
if (resource != RLIMIT_CPU) goto out; |
d3561f78f [PATCH] RLIMIT_CP... |
1467 1468 1469 1470 1471 1472 1473 |
/* * 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 */ |
ec9e16bac [PATCH] sys_setrl... |
1474 1475 1476 1477 1478 |
if (new_rlim.rlim_cur == RLIM_INFINITY) goto out; it_prof_secs = cputime_to_secs(current->signal->it_prof_expires); if (it_prof_secs == 0 || new_rlim.rlim_cur <= it_prof_secs) { |
e0661111e [PATCH] RLIMIT_CP... |
1479 1480 |
unsigned long rlim_cur = new_rlim.rlim_cur; cputime_t cputime; |
ec9e16bac [PATCH] sys_setrl... |
1481 |
|
e0661111e [PATCH] RLIMIT_CP... |
1482 |
cputime = secs_to_cputime(rlim_cur); |
1da177e4c Linux-2.6.12-rc2 |
1483 1484 |
read_lock(&tasklist_lock); spin_lock_irq(¤t->sighand->siglock); |
ec9e16bac [PATCH] sys_setrl... |
1485 |
set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1486 1487 1488 |
spin_unlock_irq(¤t->sighand->siglock); read_unlock(&tasklist_lock); } |
ec9e16bac [PATCH] sys_setrl... |
1489 |
out: |
1da177e4c Linux-2.6.12-rc2 |
1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 |
return 0; } /* * 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 |
1501 1502 1503 1504 1505 1506 1507 |
* 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... |
1508 |
* |
de047c1bc [PATCH] avoid tas... |
1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 |
* 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... |
1523 |
* |
1da177e4c Linux-2.6.12-rc2 |
1524 |
*/ |
679c9cd4a add RUSAGE_THREAD |
1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 |
static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r, cputime_t *utimep, cputime_t *stimep) { *utimep = cputime_add(*utimep, t->utime); *stimep = cputime_add(*stimep, t->stime); 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 |
1537 1538 1539 1540 1541 1542 1543 |
static void k_getrusage(struct task_struct *p, int who, struct rusage *r) { struct task_struct *t; unsigned long flags; cputime_t utime, stime; memset((char *) r, 0, sizeof *r); |
2dd0ebcd2 [PATCH] Avoid tak... |
1544 |
utime = stime = cputime_zero; |
1da177e4c Linux-2.6.12-rc2 |
1545 |
|
679c9cd4a add RUSAGE_THREAD |
1546 1547 1548 1549 |
if (who == RUSAGE_THREAD) { accumulate_thread_rusage(p, r, &utime, &stime); goto out; } |
d6cf723a1 k_getrusage: don'... |
1550 |
if (!lock_task_sighand(p, &flags)) |
de047c1bc [PATCH] avoid tas... |
1551 |
return; |
0f59cc4a3 [PATCH] simplify ... |
1552 |
|
1da177e4c Linux-2.6.12-rc2 |
1553 |
switch (who) { |
0f59cc4a3 [PATCH] simplify ... |
1554 |
case RUSAGE_BOTH: |
1da177e4c Linux-2.6.12-rc2 |
1555 |
case RUSAGE_CHILDREN: |
1da177e4c Linux-2.6.12-rc2 |
1556 1557 1558 1559 1560 1561 |
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... |
1562 1563 |
r->ru_inblock = p->signal->cinblock; r->ru_oublock = p->signal->coublock; |
0f59cc4a3 [PATCH] simplify ... |
1564 1565 1566 |
if (who == RUSAGE_CHILDREN) break; |
1da177e4c Linux-2.6.12-rc2 |
1567 |
case RUSAGE_SELF: |
1da177e4c Linux-2.6.12-rc2 |
1568 1569 1570 1571 1572 1573 |
utime = cputime_add(utime, p->signal->utime); stime = cputime_add(stime, p->signal->stime); 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... |
1574 1575 |
r->ru_inblock += p->signal->inblock; r->ru_oublock += p->signal->oublock; |
1da177e4c Linux-2.6.12-rc2 |
1576 1577 |
t = p; do { |
679c9cd4a add RUSAGE_THREAD |
1578 |
accumulate_thread_rusage(t, r, &utime, &stime); |
1da177e4c Linux-2.6.12-rc2 |
1579 1580 |
t = next_thread(t); } while (t != p); |
1da177e4c Linux-2.6.12-rc2 |
1581 |
break; |
0f59cc4a3 [PATCH] simplify ... |
1582 |
|
1da177e4c Linux-2.6.12-rc2 |
1583 1584 1585 |
default: BUG(); } |
de047c1bc [PATCH] avoid tas... |
1586 |
unlock_task_sighand(p, &flags); |
de047c1bc [PATCH] avoid tas... |
1587 |
|
679c9cd4a add RUSAGE_THREAD |
1588 |
out: |
0f59cc4a3 [PATCH] simplify ... |
1589 1590 |
cputime_to_timeval(utime, &r->ru_utime); cputime_to_timeval(stime, &r->ru_stime); |
1da177e4c Linux-2.6.12-rc2 |
1591 1592 1593 1594 1595 |
} int getrusage(struct task_struct *p, int who, struct rusage __user *ru) { struct rusage r; |
1da177e4c Linux-2.6.12-rc2 |
1596 |
k_getrusage(p, who, &r); |
1da177e4c Linux-2.6.12-rc2 |
1597 1598 1599 1600 1601 |
return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; } asmlinkage long sys_getrusage(int who, struct rusage __user *ru) { |
679c9cd4a add RUSAGE_THREAD |
1602 1603 |
if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && who != RUSAGE_THREAD) |
1da177e4c Linux-2.6.12-rc2 |
1604 1605 1606 1607 1608 1609 1610 1611 1612 |
return -EINVAL; return getrusage(current, who, ru); } asmlinkage long sys_umask(int mask) { mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); return mask; } |
3b7391de6 capabilities: int... |
1613 |
|
1da177e4c Linux-2.6.12-rc2 |
1614 1615 1616 |
asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5) { |
7b26655f6 sys_prctl(): fix ... |
1617 |
long error = 0; |
1da177e4c Linux-2.6.12-rc2 |
1618 |
|
3898b1b4e capabilities: imp... |
1619 |
if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error)) |
1da177e4c Linux-2.6.12-rc2 |
1620 1621 1622 1623 |
return error; switch (option) { case PR_SET_PDEATHSIG: |
0730ded5b [PATCH] remove a ... |
1624 |
if (!valid_signal(arg2)) { |
1da177e4c Linux-2.6.12-rc2 |
1625 1626 1627 |
error = -EINVAL; break; } |
0730ded5b [PATCH] remove a ... |
1628 |
current->pdeath_signal = arg2; |
1da177e4c Linux-2.6.12-rc2 |
1629 1630 1631 1632 1633 |
break; case PR_GET_PDEATHSIG: error = put_user(current->pdeath_signal, (int __user *)arg2); break; case PR_GET_DUMPABLE: |
6c5d52382 coredump masking:... |
1634 |
error = get_dumpable(current->mm); |
1da177e4c Linux-2.6.12-rc2 |
1635 1636 |
break; case PR_SET_DUMPABLE: |
abf75a503 [PATCH] Fix prctl... |
1637 |
if (arg2 < 0 || arg2 > 1) { |
1da177e4c Linux-2.6.12-rc2 |
1638 1639 1640 |
error = -EINVAL; break; } |
6c5d52382 coredump masking:... |
1641 |
set_dumpable(current->mm, arg2); |
1da177e4c Linux-2.6.12-rc2 |
1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 |
break; case PR_SET_UNALIGN: error = SET_UNALIGN_CTL(current, arg2); break; case PR_GET_UNALIGN: error = GET_UNALIGN_CTL(current, arg2); break; case PR_SET_FPEMU: error = SET_FPEMU_CTL(current, arg2); break; case PR_GET_FPEMU: error = GET_FPEMU_CTL(current, arg2); break; case PR_SET_FPEXC: error = SET_FPEXC_CTL(current, arg2); break; case PR_GET_FPEXC: error = GET_FPEXC_CTL(current, arg2); break; case PR_GET_TIMING: error = PR_TIMING_STATISTICAL; break; case PR_SET_TIMING: |
7b26655f6 sys_prctl(): fix ... |
1666 |
if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4c Linux-2.6.12-rc2 |
1667 1668 |
error = -EINVAL; break; |
1da177e4c Linux-2.6.12-rc2 |
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 |
case PR_SET_NAME: { struct task_struct *me = current; unsigned char ncomm[sizeof(me->comm)]; ncomm[sizeof(me->comm)-1] = 0; if (strncpy_from_user(ncomm, (char __user *)arg2, sizeof(me->comm)-1) < 0) return -EFAULT; set_task_comm(me, ncomm); return 0; } case PR_GET_NAME: { struct task_struct *me = current; unsigned char tcomm[sizeof(me->comm)]; get_task_comm(tcomm, me); if (copy_to_user((char __user *)arg2, tcomm, sizeof(tcomm))) return -EFAULT; return 0; } |
651d765d0 [PATCH] Add a prc... |
1689 1690 1691 1692 1693 1694 |
case PR_GET_ENDIAN: error = GET_ENDIAN(current, arg2); break; case PR_SET_ENDIAN: error = SET_ENDIAN(current, arg2); break; |
1d9d02fee move seccomp from... |
1695 1696 1697 1698 1699 1700 |
case PR_GET_SECCOMP: error = prctl_get_seccomp(); break; case PR_SET_SECCOMP: error = prctl_set_seccomp(arg2); break; |
8fb402bcc generic, x86: add... |
1701 1702 1703 1704 1705 1706 |
case PR_GET_TSC: error = GET_TSC_CTL(arg2); break; case PR_SET_TSC: error = SET_TSC_CTL(arg2); break; |
1da177e4c Linux-2.6.12-rc2 |
1707 1708 1709 1710 1711 1712 |
default: error = -EINVAL; break; } return error; } |
3cfc348bf [PATCH] x86: Add ... |
1713 1714 |
asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep, |
4307d1e5a x86: ignore the s... |
1715 |
struct getcpu_cache __user *unused) |
3cfc348bf [PATCH] x86: Add ... |
1716 1717 1718 1719 1720 1721 1722 |
{ 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 ... |
1723 1724 |
return err ? -EFAULT : 0; } |
10a0a8d4e Add common orderl... |
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 |
char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; static void argv_cleanup(char **argv, char **envp) { argv_free(argv); } /** * 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... |
1758 |
info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4e Add common orderl... |
1759 1760 1761 1762 1763 1764 |
if (info == NULL) { argv_free(argv); goto out; } call_usermodehelper_setcleanup(info, argv_cleanup); |
86313c488 usermodehelper: T... |
1765 |
ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4e Add common orderl... |
1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 |
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); |