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(parent: 8c46fa9) | patch
sysctl: reject gigantic reads/write to sysctl files
authorChristoph Hellwig <hch@lst.de>
Tue, 9 Jun 2020 17:08:19 +0000 (19:08 +0200)
committerAl Viro <viro@zeniv.linux.org.uk>
Wed, 10 Jun 2020 18:11:33 +0000 (14:11 -0400)
commitef9d965bc8b6fce5bcc0ae76a4a5b3ed91ee81eb
treeb8c9350abed0e245cbda54b026158f78a977cbe0tree
parent8c46fa96822c28ca81036e26c2d963f1fac9a961commit | diff
sysctl: reject gigantic reads/write to sysctl files

Instead of triggering a WARN_ON deep down in the page allocator just
give up early on allocations that are way larger than the usual sysctl
values.

Fixes: 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler")
Reported-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
fs/proc/proc_sysctl.c diff | blob | history
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