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| author | Al Viro <viro@zeniv.linux.org.uk> | 2009-12-05 15:10:44 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2009-12-11 06:44:59 -0500 |
| commit | e77414e0aad6a1b063ba5e5750c582c75327ea6a (patch) | |
| tree | 9492b584ce6a3e4f99570ce4517d7efaaff4fb93 /arch/mips/kernel/syscall.c | |
| parent | bb52d6694002b9d632bb355f64daa045c6293a4e (diff) | |
| download | lwn-e77414e0aad6a1b063ba5e5750c582c75327ea6a.tar.gz lwn-e77414e0aad6a1b063ba5e5750c582c75327ea6a.zip | |
fix broken aliasing checks for MAP_FIXED on sparc32, mips, arm and sh
We want addr - (pgoff << PAGE_SHIFT) consistently coloured...
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/mips/kernel/syscall.c')
| -rw-r--r-- | arch/mips/kernel/syscall.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c index c25b2e7dcb7b..3f7f466190b4 100644 --- a/arch/mips/kernel/syscall.c +++ b/arch/mips/kernel/syscall.c @@ -93,7 +93,8 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, * We do not accept a shared mapping if it would violate * cache aliasing constraints. */ - if ((flags & MAP_SHARED) && (addr & shm_align_mask)) + if ((flags & MAP_SHARED) && + ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask)) return -EINVAL; return addr; } |