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| author |   David S. Miller <davem@sunset.davemloft.net> | 2006-10-22 21:53:30 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-10-22 21:53:30 -0700 |
| commit | a94b1d1fd7ca3129e1d38d38167779fa6ee69780 (patch) | |
| tree | ba1de0d26b7cfce4f0c2f9245a4293c55da32ca5 /include/asm-sparc64 | |
| parent | Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6 (diff) | |
| download | linux-dev-a94b1d1fd7ca3129e1d38d38167779fa6ee69780.tar.xz linux-dev-a94b1d1fd7ca3129e1d38d38167779fa6ee69780.zip | |
[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>
Diffstat (limited to 'include/asm-sparc64')
| -rw-r--r-- | include/asm-sparc64/compat.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/include/asm-sparc64/compat.h b/include/asm-sparc64/compat.h index c73935dc7ba1..36511ca51416 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 { |