Commit f1fb34c2 authored by John Ogness's avatar John Ogness Committed by Greg Kroah-Hartman

fs/proc/array.c: allow reporting eip/esp for all coredumping threads

commit cb8f381f upstream.

0a1eb2d4 ("fs/proc: Stop reporting eip and esp in /proc/PID/stat")
stopped reporting eip/esp and fd7d5627 ("fs/proc: Report eip/esp in
/prod/PID/stat for coredumping") reintroduced the feature to fix a
regression with userspace core dump handlers (such as minicoredumper).

Because PF_DUMPCORE is only set for the primary thread, this didn't fix
the original problem for secondary threads.  Allow reporting the eip/esp
for all threads by checking for PF_EXITING as well.  This is set for all
the other threads when they are killed.  coredump_wait() waits for all the
tasks to become inactive before proceeding to invoke a core dumper.

Link: http://lkml.kernel.org/r/87y32p7i7a.fsf@linutronix.de
Link: http://lkml.kernel.org/r/20190522161614.628-1-jlu@pengutronix.de
Fixes: fd7d5627 ("fs/proc: Report eip/esp in /prod/PID/stat for coredumping")
Signed-off-by: default avatarJohn Ogness <john.ogness@linutronix.de>
Reported-by: default avatarJan Luebbe <jlu@pengutronix.de>
Tested-by: default avatarJan Luebbe <jlu@pengutronix.de>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4d750447
...@@ -462,7 +462,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, ...@@ -462,7 +462,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
* a program is not able to use ptrace(2) in that case. It is * a program is not able to use ptrace(2) in that case. It is
* safe because the task has stopped executing permanently. * safe because the task has stopped executing permanently.
*/ */
if (permitted && (task->flags & PF_DUMPCORE)) { if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {
if (try_get_task_stack(task)) { if (try_get_task_stack(task)) {
eip = KSTK_EIP(task); eip = KSTK_EIP(task);
esp = KSTK_ESP(task); esp = KSTK_ESP(task);
......
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