This is a note to let you know that I've just added the patch titled
mm/damon/dbgfs: avoid duplicate context directory creation
to the 5.15-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:
mm-damon-dbgfs-avoid-duplicate-context-directory-creation.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d26f60703606ab425eee9882b32a1781a8bed74d Mon Sep 17 00:00:00 2001
From: Badari Pulavarty <badari.pulavarty@xxxxxxxxx>
Date: Sun, 21 Aug 2022 18:08:53 +0000
Subject: mm/damon/dbgfs: avoid duplicate context directory creation
From: Badari Pulavarty <badari.pulavarty@xxxxxxxxx>
commit d26f60703606ab425eee9882b32a1781a8bed74d upstream.
When user tries to create a DAMON context via the DAMON debugfs interface
with a name of an already existing context, the context directory creation
fails but a new context is created and added in the internal data
structure, due to absence of the directory creation success check. As a
result, memory could leak and DAMON cannot be turned on. An example test
case is as below:
# cd /sys/kernel/debug/damon/
# echo "off" > monitor_on
# echo paddr > target_ids
# echo "abc" > mk_context
# echo "abc" > mk_context
# echo $$ > abc/target_ids
# echo "on" > monitor_on <<< fails
Return value of 'debugfs_create_dir()' is expected to be ignored in
general, but this is an exceptional case as DAMON feature is depending
on the debugfs functionality and it has the potential duplicate name
issue. This commit therefore fixes the issue by checking the directory
creation failure and immediately return the error in the case.
Link: https://lkml.kernel.org/r/20220821180853.2400-1-sj@xxxxxxxxxx
Fixes: 75c1c2b53c78 ("mm/damon/dbgfs: support multiple contexts")
Signed-off-by: Badari Pulavarty <badari.pulavarty@xxxxxxxxx>
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [ 5.15.x]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/damon/dbgfs.c | 3 +++
1 file changed, 3 insertions(+)
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -376,6 +376,9 @@ static int dbgfs_mk_context(char *name)
return -ENOENT;
new_dir = debugfs_create_dir(name, root);
+ /* Below check is required for a potential duplicated name case */
+ if (IS_ERR(new_dir))
+ return PTR_ERR(new_dir);
dbgfs_dirs[dbgfs_nr_ctxs] = new_dir;
new_ctx = dbgfs_new_ctx();
Patches currently in stable-queue which might be from badari.pulavarty@xxxxxxxxx are
queue-5.15/mm-damon-dbgfs-avoid-duplicate-context-directory-creation.patch
