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authorAl Viro <viro@zeniv.linux.org.uk>2009-12-05 21:10:44 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2009-12-11 12:44:59 +0100
commite77414e0aad6a1b063ba5e5750c582c75327ea6a (patch)
tree9492b584ce6a3e4f99570ce4517d7efaaff4fb93 /arch/mips
parentGet rid of open-coding in ia64_brk() (diff)
downloadlinux-e77414e0aad6a1b063ba5e5750c582c75327ea6a.tar.xz
linux-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')
-rw-r--r--arch/mips/kernel/syscall.c3
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;
}