[GIT] security/mm: fix regression introduced by mmap_min_addrcheck

[James Morris]

A check for CAP_SYS_RAWIO was introduced when accessing 
/proc/sys/vm/mmap_min_addr in the following patch:

commit 0e1a6ef2dea88101b056b6d9984f3325c5efced3
Author: Kees Cook <kees.cook@xxxxxxxxxxxxx>
Date:   Sun Nov 8 09:37:00 2009 -0800

    sysctl: require CAP_SYS_RAWIO to set mmap_min_addr

this has caused regressions for unprivileged userland apps which want to 
read this value:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/568844

A patch to fix this has been in -next for some time, and given the reports 
of userland breakage, it should probably go into mainline before 2.6.34 -- 
please pull per the request below.

(The patch may also be suitable for the 2.6.32 and 2.6.33 stable trees).


The following changes since commit 6a251b0ab67989f468f4cb65179e0cf40cf8c295:
  Linus Torvalds (1):
        Merge branch 'for-linus' of git://git.kernel.org/.../sameo/mfd-2.6

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6 for-linus

Kees Cook (1):
      mmap_min_addr check CAP_SYS_RAWIO only for write

 security/min_addr.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


-- 
James Morris
<jmorris@xxxxxxxxx>
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