[LTP] [PATCH -next 0/2] ipc/shm: shmat() fixes around nil-page
Thu May 10 20:17:55 CEST 2018
On 05/03/2018 10:32 PM, Davidlohr Bueso wrote:
> These patches fix two issues reported a while back by Joe and Andrea
> around how shmat(2) behaves with nil-page.
> The first reverts a commit that it was incorrectly thought that mapping
> nil-page (address=0) was a no no with MAP_FIXED. This is not the case,
> with the exception of SHM_REMAP; which is address in the second patch.
Can you add appropriate Fixes: tags if possible? I guess patch 1 is
clear, dunno about patch 2...
> I chose two patches because it is easier to backport and it explicitly
> reverts bogus behaviour. Both patches ought to be in -stable and ltp
> testcases need updated (the added testcase around the cve can be modified
> to just test for SHM_RND|SHM_REMAP).
CC'd ltp so they know :)
>  lkml.kernel.org/r/20180430172152.nfa564pvgpk3ut7p@linux-n805
> Davidlohr Bueso (2):
> Revert "ipc/shm: Fix shmat mmap nil-page protection"
> ipc/shm: fix shmat() nil address after round-down when remapping
> ipc/shm.c | 19 +++++++++++--------
> 1 file changed, 11 insertions(+), 8 deletions(-)
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