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authorOleg Nesterov <oleg@tv-sign.ru>2008-04-30 00:53:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 08:29:38 -0700
commit00cd5c37afd5f431ac186dd131705048c0a11fdb (patch)
treed5412f6c720e2cee11ac66783bb45e6bd78f4a1d /kernel/ptrace.c
parent33e9fc7d01269737cd5a3b6de1db9d0e796ab708 (diff)
downloadlinux-2.6.34-ux500-00cd5c37afd5f431ac186dd131705048c0a11fdb.tar.gz
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.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 5f8d452e811..dcc199c43a1 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)