mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 01:49:36 +00:00
74dc3384fc
It appears as though the addition of the PID namespace did not update the output code for /proc/*/sched, which resulted in it providing PIDs that were not self-consistent with the /proc mount. This additionally made it trivial to detect whether a process was inside &init_pid_ns from userspace, making container detection trivial: https://github.com/jessfraz/amicontained This leads to situations such as: % unshare -pmf % mount -t proc proc /proc % head -n1 /proc/1/sched head (10047, #threads: 1) Fix this by just using task_pid_nr_ns for the output of /proc/*/sched. All of the other uses of task_pid_nr in kernel/sched/debug.c are from a sysctl context and thus don't need to be namespaced. Signed-off-by: Aleksa Sarai <asarai@suse.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Jess Frazelle <acidburn@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: cyphar@cyphar.com Link: http://lkml.kernel.org/r/20170806044141.5093-1-asarai@suse.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
#ifndef _LINUX_SCHED_DEBUG_H
|
|
#define _LINUX_SCHED_DEBUG_H
|
|
|
|
/*
|
|
* Various scheduler/task debugging interfaces:
|
|
*/
|
|
|
|
struct task_struct;
|
|
struct pid_namespace;
|
|
|
|
extern void dump_cpu_task(int cpu);
|
|
|
|
/*
|
|
* Only dump TASK_* tasks. (0 for all tasks)
|
|
*/
|
|
extern void show_state_filter(unsigned long state_filter);
|
|
|
|
static inline void show_state(void)
|
|
{
|
|
show_state_filter(0);
|
|
}
|
|
|
|
struct pt_regs;
|
|
|
|
extern void show_regs(struct pt_regs *);
|
|
|
|
/*
|
|
* TASK is a pointer to the task whose backtrace we want to see (or NULL for current
|
|
* task), SP is the stack pointer of the first frame that should be shown in the back
|
|
* trace (or NULL if the entire call-chain of the task should be shown).
|
|
*/
|
|
extern void show_stack(struct task_struct *task, unsigned long *sp);
|
|
|
|
extern void sched_show_task(struct task_struct *p);
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
struct seq_file;
|
|
extern void proc_sched_show_task(struct task_struct *p,
|
|
struct pid_namespace *ns, struct seq_file *m);
|
|
extern void proc_sched_set_task(struct task_struct *p);
|
|
#endif
|
|
|
|
/* Attach to any functions which should be ignored in wchan output. */
|
|
#define __sched __attribute__((__section__(".sched.text")))
|
|
|
|
/* Linker adds these: start and end of __sched functions */
|
|
extern char __sched_text_start[], __sched_text_end[];
|
|
|
|
/* Is this address in the __sched functions? */
|
|
extern int in_sched_functions(unsigned long addr);
|
|
|
|
#endif /* _LINUX_SCHED_DEBUG_H */
|