The patch titled
Subject: mm: Don't let userspace spam allocations warnings
has been added to the -mm tree. Its filename is
mm-dont-let-userspace-spam-allocations-warnings.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-dont-let-userspace-spam-allocations-warnings.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-dont-let-userspace-spam-allocations-warnings.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
Subject: mm: Don't let userspace spam allocations warnings
memdump_user usually gets fed unchecked userspace input. Blasting a full
backtrace into dmesg every time is a bit excessive - I'm not sure on the
kernel rule in general, but at least in drm we're trying not to let
unpriviledge userspace spam the logs freely. Definitely not entire
warning backtraces.
It also means more filtering for our CI, because our testsuite exercises
these corner cases and so hits these a lot.
Link: http://lkml.kernel.org/r/20190220204058.11676-1-daniel.vetter@xxxxxxxx
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Jan Stancek <jstancek@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Bartosz Golaszewski <brgl@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/util.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/util.c~mm-dont-let-userspace-spam-allocations-warnings
+++ a/mm/util.c
@@ -150,7 +150,7 @@ void *memdup_user(const void __user *src
{
void *p;
- p = kmalloc_track_caller(len, GFP_USER);
+ p = kmalloc_track_caller(len, GFP_USER | __GFP_NOWARN);
if (!p)
return ERR_PTR(-ENOMEM);
_
Patches currently in -mm which might be from daniel.vetter@xxxxxxxx are
mm-dont-let-userspace-spam-allocations-warnings.patch
