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authorJohn David Anglin <dave.anglin@bell.net>2013-02-02 23:44:59 +0000
committerHelge Deller <deller@gmx.de>2013-02-20 22:50:50 +0100
commit5ca8b91df88fa417aa7aac19494a8ae1602db2cb (patch)
tree513cd4f4cad27094c110ef9a2bd92b6d0847429e /arch/parisc/kernel/sys_parisc.c
parent027f27c4eca00b4411fb1fe61c33060569ff73f6 (diff)
downloadlinux-5ca8b91df88fa417aa7aac19494a8ae1602db2cb.tar.bz2
parisc: ensure that mmapped shared pages are aligned at SHMLBA addresses
Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/kernel/sys_parisc.c')
-rw-r--r--arch/parisc/kernel/sys_parisc.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index f76c10863c62..a047b3227e50 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -94,11 +94,12 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
{
if (len > TASK_SIZE)
return -ENOMEM;
- /* Might want to check for cache aliasing issues for MAP_FIXED case
- * like ARM or MIPS ??? --BenH.
- */
- if (flags & MAP_FIXED)
+ if (flags & MAP_FIXED) {
+ if ((flags & MAP_SHARED) &&
+ (addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))
+ return -EINVAL;
return addr;
+ }
if (!addr)
addr = TASK_UNMAPPED_BASE;