The patch titled
Subject: fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info()
has been added to the -mm tree. Its filename is
fs-binfmt_elfc-allocate-initialized-memory-in-fill_thread_core_info.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fs-binfmt_elfc-allocate-initialized-memory-in-fill_thread_core_info.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fs-binfmt_elfc-allocate-initialized-memory-in-fill_thread_core_info.patch
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------------------------------------------------------
From: Alexander Potapenko <glider@xxxxxxxxxx>
Subject: fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info()
KMSAN reported uninitialized data being written to disk when dumping core.
As a result, several kilobytes of kmalloc memory may be written to the
core file and then read by a non-privileged user.
Link: http://lkml.kernel.org/r/20200419100848.63472-1-glider@xxxxxxxxxx
Link: https://github.com/google/kmsan/issues/76
Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
Reported-by: sam <sunhaoyl@xxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/binfmt_elf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/binfmt_elf.c~fs-binfmt_elfc-allocate-initialized-memory-in-fill_thread_core_info
+++ a/fs/binfmt_elf.c
@@ -1733,7 +1733,7 @@ static int fill_thread_core_info(struct
(!regset->active || regset->active(t->task, regset) > 0)) {
int ret;
size_t size = regset_size(t->task, regset);
- void *data = kmalloc(size, GFP_KERNEL);
+ void *data = kzalloc(size, GFP_KERNEL);
if (unlikely(!data))
return 0;
ret = regset->get(t->task, regset,
_
Patches currently in -mm which might be from glider@xxxxxxxxxx are
fs-binfmt_elfc-allocate-initialized-memory-in-fill_thread_core_info.patch
