This is a note to let you know that I've just added the patch titled
proc: fix -ESRCH error when writing to /proc/$pid/coredump_filter
to the 4.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
proc-fix-esrch-error-when-writing-to-proc-pid-coredump_filter.patch
and it can be found in the queue-4.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 41a0c249cb8706a2efa1ab3d59466b23a27d0c8b Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Date: Fri, 18 Dec 2015 14:22:01 -0800
Subject: proc: fix -ESRCH error when writing to /proc/$pid/coredump_filter
From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
commit 41a0c249cb8706a2efa1ab3d59466b23a27d0c8b upstream.
Writing to /proc/$pid/coredump_filter always returns -ESRCH because commit
774636e19ed51 ("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: 774636e19ed51 ("proc: convert to kstrto*()/kstrto*_from_user()")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/proc/base.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2484,6 +2484,7 @@ static ssize_t proc_coredump_filter_writ
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)
Patches currently in stable-queue which might be from colin.king@xxxxxxxxxxxxx are
queue-4.3/proc-fix-esrch-error-when-writing-to-proc-pid-coredump_filter.patch
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