* [sparc] Add bugfix/sparc/compat-alloc-user-space-alignment.patch
(thanks to David Miller) to make sure that compat_alloc_user_space() always returns memory aligned on a 8-byte boundary on sparc. This prevents a number of unaligned memory accesses, like the ones in sys_msgrcv() and compat_sys_msgrcv(), triggered every 5 seconds whenever fakeroot is running. svn path=/dists/trunk/linux-2.6/; revision=7641
This commit is contained in:
parent
fbbc7444b9
commit
47d0693c0d
|
@ -9,6 +9,12 @@ linux-2.6 (2.6.18-4) UNRELEASED; urgency=low
|
||||||
* [sparc] Add bugfix/sparc/sunblade-clock-hang.patch, fixing the
|
* [sparc] Add bugfix/sparc/sunblade-clock-hang.patch, fixing the
|
||||||
boot-time crash during clock probing on SunBlade 100/150 due to
|
boot-time crash during clock probing on SunBlade 100/150 due to
|
||||||
incorrect mapping of PCI resources. (closes: #392078)
|
incorrect mapping of PCI resources. (closes: #392078)
|
||||||
|
* [sparc] Add bugfix/sparc/compat-alloc-user-space-alignment.patch
|
||||||
|
(thanks to David Miller) to make sure that compat_alloc_user_space()
|
||||||
|
always returns memory aligned on a 8-byte boundary on sparc. This
|
||||||
|
prevents a number of unaligned memory accesses, like the ones in
|
||||||
|
sys_msgrcv() and compat_sys_msgrcv(), triggered every 5 seconds whenever
|
||||||
|
fakeroot is running.
|
||||||
|
|
||||||
-- Norbert Tretkowski <nobse@debian.org> Sat, 21 Oct 2006 18:52:12 +0200
|
-- Norbert Tretkowski <nobse@debian.org> Sat, 21 Oct 2006 18:52:12 +0200
|
||||||
|
|
||||||
|
|
|
@ -0,0 +1,42 @@
|
||||||
|
commit a94b1d1fd7ca3129e1d38d38167779fa6ee69780
|
||||||
|
Author: David S. Miller <davem@sunset.davemloft.net>
|
||||||
|
Date: Sun Oct 22 21:53:30 2006 -0700
|
||||||
|
|
||||||
|
[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>
|
||||||
|
|
||||||
|
diff --git a/include/asm-sparc64/compat.h b/include/asm-sparc64/compat.h
|
||||||
|
index c73935d..36511ca 100644
|
||||||
|
--- a/include/asm-sparc64/compat.h
|
||||||
|
+++ b/include/asm-sparc64/compat.h
|
||||||
|
@@ -164,7 +164,7 @@ static inline compat_uptr_t ptr_to_compa
|
||||||
|
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_al
|
||||||
|
else
|
||||||
|
usp &= 0xffffffffUL;
|
||||||
|
|
||||||
|
- return (void __user *) (usp - len);
|
||||||
|
+ usp -= len;
|
||||||
|
+ usp &= ~0x7UL;
|
||||||
|
+
|
||||||
|
+ return (void __user *) usp;
|
||||||
|
}
|
||||||
|
|
||||||
|
struct compat_ipc64_perm {
|
|
@ -1,2 +1,3 @@
|
||||||
- sparc64-atyfb-xl-gr.patch
|
- sparc64-atyfb-xl-gr.patch
|
||||||
+ bugfix/sparc/sunblade-clock-hang.patch
|
+ bugfix/sparc/sunblade-clock-hang.patch
|
||||||
|
+ bugfix/sparc/compat-alloc-user-space-alignment.patch
|
||||||
|
|
Loading…
Reference in New Issue