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Red Hat Bugzilla – Attachment 311795 Details for
Bug 433938
CVE-2008-0598 kernel: linux x86_64 ia32 emulation leaks uninitialized data
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[patch]
Patch as used in Red Hat Enterprise Linux 4 kernel-2.6.9-67.0.20.EL
linux-2.6.9-x86_64-copy_user-zero-tail.patch (text/plain), 931 bytes, created by
Tomas Hoger
on 2008-07-15 08:38:53 UTC
(
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Description:
Patch as used in Red Hat Enterprise Linux 4 kernel-2.6.9-67.0.20.EL
Filename:
MIME Type:
Creator:
Tomas Hoger
Created:
2008-07-15 08:38:53 UTC
Size:
931 bytes
patch
obsolete
>diff --git a/arch/x86_64/lib/copy_user.S b/arch/x86_64/lib/copy_user.S >index bd556c8..b097ba7 100644 >--- a/arch/x86_64/lib/copy_user.S >+++ b/arch/x86_64/lib/copy_user.S >@@ -93,7 +93,7 @@ copy_user_generic: > .byte 5 > .byte 5 > .previous >-.Lcug: >+.Lcug: > pushq %rbx > xorl %eax,%eax /*zero for the exception handler */ > >@@ -275,20 +275,30 @@ copy_user_generic: > * eax uncopied bytes or 0 if successfull. > */ > copy_user_generic_c: >+ xorq %rax,%rax > movl %edx,%ecx > shrl $3,%ecx >- andl $7,%edx >-1: rep >+ andl $7,%edx >+.Lc1: rep > movsq > movl %edx,%ecx >-2: rep >+.Lc2: rep > movsb >-4: movl %ecx,%eax > ret >-3: lea (%rdx,%rcx,8),%rax >+ >+.Lc1e: movq %rcx,%rsi >+.Lc3: rep >+ stosq >+.Lc2e: movl %edx,%ecx >+.Lc4: rep >+ stosb >+.Lc3e: leaq (%rdx,%rsi,8),%rax > ret >- >+ > .section __ex_table,"a" >- .quad 1b,3b >- .quad 2b,4b >+ .align 8 >+ .quad .Lc1,.Lc1e >+ .quad .Lc2,.Lc2e >+ .quad .Lc3,.Lc3e >+ .quad .Lc4,.Lc3e > .previous
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