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elf: fix NT_FILE integer overflow
If vm.max_map_count bumped above 2^26 (67+ mil) and system has enough RAM to allocate all the VMAs (~12.8 GB on Fedora 27 with 200-byte VMAs), then it should be possible to overflow 32-bit "size", pass paranoia check, allocate very little vmalloc space and oops while writing into vmalloc guard page... But I didn't test this, only coredump of regular process. Link: http://lkml.kernel.org/r/20180112203427.GA9109@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1599,6 +1599,8 @@ static int fill_files_note(struct memelfnote *note)
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/* *Estimated* file count and total data size needed */
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count = current->mm->map_count;
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if (count > UINT_MAX / 64)
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return -EINVAL;
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size = count * 64;
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names_ofs = (2 + 3 * count) * sizeof(data[0]);
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