diff options
author | Jason Baron <jbaron@akamai.com> | 2016-12-12 16:46:40 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-12 18:55:10 -0800 |
commit | 30f74aa0854c2d5a331b507b14fe421ba4980511 (patch) | |
tree | db150237a10336a84e822e626e275374a5485b67 | |
parent | a82603a8325f89ec53d4c3e249a2e831b747a69d (diff) |
binfmt_elf: use vmalloc() for allocation of vma_filesz
We have observed page allocations failures of order 4 during core dump
while trying to allocate vma_filesz. This results in a useless core
file of size 0. To improve reliability use vmalloc().
Note that the vmalloc() allocation is bounded by sysctl_max_map_count,
which is 65,530 by default. So with a 4k page size, and 8 bytes per
seg, this is a max of 128 pages or an order 7 allocation. Other parts
of the core dump path, such as fill_files_note() are already using
vmalloc() for presumably similar reasons.
Link: http://lkml.kernel.org/r/1479745791-17611-1-git-send-email-jbaron@akamai.com
Signed-off-by: Jason Baron <jbaron@akamai.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>