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authorAl Viro <viro@zeniv.linux.org.uk>2009-12-05 15:10:44 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2009-12-11 06:44:59 -0500
commite77414e0aad6a1b063ba5e5750c582c75327ea6a (patch)
tree9492b584ce6a3e4f99570ce4517d7efaaff4fb93 /arch/sparc
parentbb52d6694002b9d632bb355f64daa045c6293a4e (diff)
downloadlinux-2.6.38-lt-ux500-e77414e0aad6a1b063ba5e5750c582c75327ea6a.tar.gz
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/sparc')
-rw-r--r--arch/sparc/kernel/sys_sparc_32.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
index 997bdd0d3d7..3a82e65d8db 100644
--- a/arch/sparc/kernel/sys_sparc_32.c
+++ b/arch/sparc/kernel/sys_sparc_32.c
@@ -45,7 +45,8 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
/* We do not accept a shared mapping if it would violate
* cache aliasing constraints.
*/
- if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
+ if ((flags & MAP_SHARED) &&
+ ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
return -EINVAL;
return addr;
}