diff options
| author | Nicolas Pitre <nico@cam.org> | 2006-03-25 23:44:05 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-03-25 23:44:05 +0100 |
| commit | 2ce9804fbd9d4da75fb5bb53331b46b614a7d5c3 (patch) | |
| tree | 8b5770e7f6910d518227d68db34f1f322f4d69c7 /drivers/cpufreq/cpufreq_conservative.c | |
| parent | Merge nommu tree (diff) | |
| download | linux-2ce9804fbd9d4da75fb5bb53331b46b614a7d5c3.tar.xz linux-2ce9804fbd9d4da75fb5bb53331b46b614a7d5c3.zip | |
[ARM] 3030/2: fix permission check in the obscur cmpxchg syscall
Patch from Nicolas Pitre
Quoting RMK:
|pte_write() just says that the page _may_ be writable. It doesn't say
|that the MMU is programmed to allow writes. If pte_dirty() doesn't
|return true, that means that the page is _not_ writable from userspace.
|If you write to it from kernel mode (without using put_user) you'll
|bypass the MMU read-only protection and may end up writing to a page
|owned by two separate processes.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/cpufreq/cpufreq_conservative.c')
0 files changed, 0 insertions, 0 deletions