Commit 41a0c249 authored by Colin Ian King's avatar Colin Ian King Committed by Linus Torvalds

proc: fix -ESRCH error when writing to /proc/$pid/coredump_filter

Writing to /proc/$pid/coredump_filter always returns -ESRCH because commit
774636e1 ("proc: convert to kstrto*()/kstrto*_from_user()") removed
the setting of ret after the get_proc_task call and incorrectly left it as
-ESRCH.  Instead, return 0 when successful.

Example breakage:

  echo 0 > /proc/self/coredump_filter
  bash: echo: write error: No such process

Fixes: 774636e1 ("proc: convert to kstrto*()/kstrto*_from_user()")
Signed-off-by: default avatarColin Ian King <colin.king@canonical.com>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Cc: <stable@vger.kernel.org> [4.3+]
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 73796d8b
......@@ -2494,6 +2494,7 @@ static ssize_t proc_coredump_filter_write(struct file *file,
mm = get_task_mm(task);
if (!mm)
goto out_no_mm;
ret = 0;
for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
if (val & mask)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment