From: Alexander Nyberg <alexn@telia.com>
Date: Thu, 21 Apr 2005 14:59:51 +0000 (-0700)
Subject: [PATCH] x86_64: Bug in new out of line put_user()
X-Git-Tag: v2.6.12-rc4~295
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a6fd752a50af92765853879f4a11cc0cfcd0320;p=linux-2.6

[PATCH] x86_64: Bug in new out of line put_user()

The new out of line put_user() assembly on x86_64 changes %rcx without
telling GCC about it causing things like:

http://bugme.osdl.org/show_bug.cgi?id=4515

See to it that %rcx is not changed (made it consistent with get_user()).

Signed-off-by: Alexander Nyberg <alexn@telia.com>
Signed-off-by: ak@suse.de
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/x86_64/lib/getuser.S b/arch/x86_64/lib/getuser.S
index f94ea8a440..f80bafee86 100644
--- a/arch/x86_64/lib/getuser.S
+++ b/arch/x86_64/lib/getuser.S
@@ -78,9 +78,9 @@ __get_user_4:
 __get_user_8:
 	GET_THREAD_INFO(%r8)
 	addq $7,%rcx
-	jc bad_get_user
+	jc 40f
 	cmpq threadinfo_addr_limit(%r8),%rcx
-	jae	bad_get_user
+	jae	40f
 	subq	$7,%rcx
 4:	movq (%rcx),%rdx
 	xorl %eax,%eax
diff --git a/arch/x86_64/lib/putuser.S b/arch/x86_64/lib/putuser.S
index 0dee1fdcb1..d9d3e5ec9a 100644
--- a/arch/x86_64/lib/putuser.S
+++ b/arch/x86_64/lib/putuser.S
@@ -46,36 +46,45 @@ __put_user_1:
 __put_user_2:
 	GET_THREAD_INFO(%r8)
 	addq $1,%rcx
-	jc bad_put_user
+	jc 20f
 	cmpq threadinfo_addr_limit(%r8),%rcx
-	jae	 bad_put_user
-2:	movw %dx,-1(%rcx)
+	jae 20f
+2:	decq %rcx
+	movw %dx,(%rcx)
 	xorl %eax,%eax
 	ret
+20:	decq %rcx
+	jmp bad_put_user
 
 	.p2align 4
 .globl __put_user_4
 __put_user_4:
 	GET_THREAD_INFO(%r8)
 	addq $3,%rcx
-	jc bad_put_user
+	jc 30f
 	cmpq threadinfo_addr_limit(%r8),%rcx
-	jae bad_put_user
-3:	movl %edx,-3(%rcx)
+	jae 30f
+3:	subq $3,%rcx
+	movl %edx,(%rcx)
 	xorl %eax,%eax
 	ret
+30:	subq $3,%rcx
+	jmp bad_put_user
 
 	.p2align 4
 .globl __put_user_8
 __put_user_8:
 	GET_THREAD_INFO(%r8)
 	addq $7,%rcx
-	jc bad_put_user
+	jc 40f
 	cmpq threadinfo_addr_limit(%r8),%rcx
-	jae	bad_put_user
-4:	movq %rdx,-7(%rcx)
+	jae 40f
+4:	subq $7,%rcx
+	movq %rdx,(%rcx)
 	xorl %eax,%eax
 	ret
+40:	subq $7,%rcx
+	jmp bad_put_user
 
 bad_put_user:
 	movq $(-EFAULT),%rax