]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
mm: Don't count the stack guard page towards RLIMIT_STACK
authorLinus Torvalds <torvalds@linux-foundation.org>
Sun, 11 Jan 2015 19:33:57 +0000 (11:33 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sun, 11 Jan 2015 19:33:57 +0000 (11:33 -0800)
commit690eac53daff34169a4d74fc7bfbd388c4896abb
tree72d9df754ed4291de6287c30502dd66a04aa6845
parent4850d37d3a7c049f7dc3eb09d7ae4e5553ac521b
mm: Don't count the stack guard page towards RLIMIT_STACK

Commit fee7e49d4514 ("mm: propagate error from stack expansion even for
guard page") made sure that we return the error properly for stack
growth conditions.  It also theorized that counting the guard page
towards the stack limit might break something, but also said "Let's see
if anybody notices".

Somebody did notice.  Apparently android-x86 sets the stack limit very
close to the limit indeed, and including the guard page in the rlimit
check causes the android 'zygote' process problems.

So this adds the (fairly trivial) code to make the stack rlimit check be
against the actual real stack size, rather than the size of the vma that
includes the guard page.

Reported-and-tested-by: Chih-Wei Huang <cwhuang@android-x86.org>
Cc: Jay Foad <jay.foad@gmail.com>
Cc: stable@kernel.org # to match back-porting of fee7e49d4514
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/mmap.c