fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info()
[ Upstream commit 1d605416fb7175e1adf094251466caa52093b413 ] 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>zero-colors
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@ -1731,7 +1731,7 @@ static int fill_thread_core_info(struct elf_thread_core_info *t,
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(!regset->active || regset->active(t->task, regset) > 0)) {
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int ret;
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size_t size = regset_size(t->task, regset);
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void *data = kmalloc(size, GFP_KERNEL);
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void *data = kzalloc(size, GFP_KERNEL);
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if (unlikely(!data))
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return 0;
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ret = regset->get(t->task, regset,
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