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fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info()

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[ Upstream commit 1d605416fb ]

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.

Reported-by: sam <sunhaoyl@outlook.com>
Signed-off-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200419100848.63472-1-glider@google.com
Link: https://github.com/google/kmsan/issues/76
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexander Potapenko 2020-05-27 22:20:52 -07:00 committed by Greg Kroah-Hartman
parent de482c445b
commit a02c130efb
1 changed files with 1 additions and 1 deletions
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fs/binfmt_elf.c
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@ -1731,7 +1731,7 @@ static int fill_thread_core_info(struct elf_thread_core_info *t,
(!regset->active || regset->active(t->task, regset) > 0)) { (!regset->active || regset->active(t->task, regset) > 0)) {
int ret; int ret;
size_t size = regset_size(t->task, regset); size_t size = regset_size(t->task, regset);
void *data = kmalloc(size, GFP_KERNEL); void *data = kzalloc(size, GFP_KERNEL);
if (unlikely(!data)) if (unlikely(!data))
return 0; return 0;
ret = regset->get(t->task, regset, ret = regset->get(t->task, regset,