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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-04-30 00:53:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:38 -0700 |
| commit | 00cd5c37afd5f431ac186dd131705048c0a11fdb (patch) | |
| tree | d5412f6c720e2cee11ac66783bb45e6bd78f4a1d /kernel/ptrace.c | |
| parent | 33e9fc7d01269737cd5a3b6de1db9d0e796ab708 (diff) | |
| download | kernel-common-00cd5c37afd5f431ac186dd131705048c0a11fdb.tar.gz kernel-common-00cd5c37afd5f431ac186dd131705048c0a11fdb.tar.bz2 kernel-common-00cd5c37afd5f431ac186dd131705048c0a11fdb.zip | |
ptrace: permit ptracing of /sbin/init
Afaics, currently there are no kernel problems with ptracing init, it can't
lose SIGNAL_UNKILLABLE flag and be killed/stopped by accident.
The ability to strace/debug init can be very useful if you try to figure out
why it does not work as expected.
However, admin should know what he does, "gdb /sbin/init 1" stops init, it
can't reap orphaned zombies or take care of /etc/inittab until continued. It
is even possible to crash init (and thus the whole system) if you wish,
ptracer has full control.
See also the long discussion: http://marc.info/?t=120628018600001
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Roland McGrath <roland@redhat.com>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/ptrace.c')
| -rw-r--r-- | kernel/ptrace.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 5f8d452e8111..dcc199c43a12 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -168,8 +168,6 @@ int ptrace_attach(struct task_struct *task) audit_ptrace(task); retval = -EPERM; - if (task->pid <= 1) - goto out; if (same_thread_group(task, current)) goto out; @@ -521,12 +519,6 @@ struct task_struct *ptrace_get_task_struct(pid_t pid) { struct task_struct *child; - /* - * Tracing init is not allowed. - */ - if (pid == 1) - return ERR_PTR(-EPERM); - read_lock(&tasklist_lock); child = find_task_by_vpid(pid); if (child) |