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| author | Alexander Potapenko <glider@google.com> | 2020-05-27 22:20:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-05-28 11:35:40 -0700 |
| commit | 1d605416fb7175e1adf094251466caa52093b413 (patch) | |
| tree | 0116d920c5facf13b63774d9e9a9248748075924 /fs/binfmt_elf.c | |
| parent | 6988f31d558aa8c744464a7f6d91d34ada48ad12 (diff) | |
| download | linux-1d605416fb7175e1adf094251466caa52093b413.tar.gz linux-1d605416fb7175e1adf094251466caa52093b413.tar.bz2 linux-1d605416fb7175e1adf094251466caa52093b413.zip | |
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.
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>
Diffstat (limited to 'fs/binfmt_elf.c')
| -rw-r--r-- | fs/binfmt_elf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 13f25e241ac4..25d489bc9453 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -1733,7 +1733,7 @@ static int fill_thread_core_info(struct elf_thread_core_info *t, (!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, |