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authorDavid S. Miller <davem@sunset.davemloft.net>2006-10-22 21:53:30 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-10-22 21:53:30 -0700
commita94b1d1fd7ca3129e1d38d38167779fa6ee69780 (patch)
treeba1de0d26b7cfce4f0c2f9245a4293c55da32ca5
parent5cfc35cf79d46af998346e3d5cc66fa344d1af0e (diff)
[SPARC64]: 8-byte align return value from compat_alloc_user_space()
Otherwise we get a ton of unaligned exceptions, for cases such as compat_sys_msgrcv() which go: p = compat_alloc_user_space(second + sizeof(struct msgbuf)); and here 'second' can for example be an arbitrary odd value. Based upon a bug report from Jurij Smakov. Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/asm-sparc64/compat.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/asm-sparc64/compat.h b/include/asm-sparc64/compat.h
index c73935dc7ba..36511ca5141 100644
--- a/include/asm-sparc64/compat.h
+++ b/include/asm-sparc64/compat.h
@@ -164,7 +164,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
return (u32)(unsigned long)uptr;
}
-static __inline__ void __user *compat_alloc_user_space(long len)
+static inline void __user *compat_alloc_user_space(long len)
{
struct pt_regs *regs = current_thread_info()->kregs;
unsigned long usp = regs->u_regs[UREG_I6];
@@ -174,7 +174,10 @@ static __inline__ void __user *compat_alloc_user_space(long len)
else
usp &= 0xffffffffUL;
- return (void __user *) (usp - len);
+ usp -= len;
+ usp &= ~0x7UL;
+
+ return (void __user *) usp;
}
struct compat_ipc64_perm {