Messages in this thread Patch in this message | | | Date | Fri, 12 Jan 2018 23:34:27 +0300 | From | Alexey Dobriyan <> | Subject | [PATCH] elf: fix NT_FILE integer overflow |
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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.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> ---
fs/binfmt_elf.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -1599,6 +1599,8 @@ static int fill_files_note(struct memelfnote *note) /* *Estimated* file count and total data size needed */ count = current->mm->map_count; + if (count > UINT_MAX / 64) + return -EINVAL; size = count * 64; names_ofs = (2 + 3 * count) * sizeof(data[0]);
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