The patch titled
ptrace: permit ptracing of /sbin/init
has been removed from the -mm tree. Its filename was
ptrace-allow-to-ptrace-sbin-init.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: ptrace: permit ptracing of /sbin/init
From: Oleg Nesterov <oleg@xxxxxxxxxx>
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@xxxxxxxxxx>
Acked-by: Roland McGrath <roland@xxxxxxxxxx>
Acked-by: Pavel Emelyanov <xemul@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/ptrace.c | 8 --------
1 file changed, 8 deletions(-)
diff -puN kernel/ptrace.c~ptrace-allow-to-ptrace-sbin-init kernel/ptrace.c
--- a/kernel/ptrace.c~ptrace-allow-to-ptrace-sbin-init
+++ a/kernel/ptrace.c
@@ -168,8 +168,6 @@ int ptrace_attach(struct task_struct *ta
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_stru
{
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)
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
posix-timers-bug-10460-discard-the-pending-signal-when-the-timer-is-destroyed.patch
workqueue-remove-redundant-function-invocation.patch
put_pid-make-sure-we-dont-free-the-live-pid.patch
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