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* [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:
Jurij Smakov 2006-10-24 03:01:51 +00:00
parent fbbc7444b9
commit 47d0693c0d
3 changed files with 49 additions and 0 deletions
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6
debian/changelog vendored
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@ -9,6 +9,12 @@ linux-2.6 (2.6.18-4) UNRELEASED; urgency=low
* [sparc] Add bugfix/sparc/sunblade-clock-hang.patch, fixing the
boot-time crash during clock probing on SunBlade 100/150 due to
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

42
debian/patches/bugfix/sparc/compat-alloc-user-space-alignment.patch vendored Normal file
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@ -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
debian/patches/series/4 vendored
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@ -1,2 +1,3 @@
- sparc64-atyfb-xl-gr.patch
+ bugfix/sparc/sunblade-clock-hang.patch
+ bugfix/sparc/compat-alloc-user-space-alignment.patch