[uml-devel] [patch 18/18] x86_64: fix 2.6.18 regression - PTRACE_OLDSETOPTIONS should be accepted

[uml-devel] [patch 18/18] x86_64: fix 2.6.18 regression - PTRACE_OLDSETOPTIONS should be accepted

[Greg KH]

[-- Attachment #1: x86_64-fix-2.6.18-regression-ptrace_oldsetoptions-should-be-accepted.patch --]
[-- Type: text/plain, Size: 1978 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: "Paolo 'Blaisorblade' Giarrusso" <blaisorblade@yahoo.it>

Also PTRACE_OLDSETOPTIONS should be accepted, as done by kernel/ptrace.c and
forced by binary compatibility. UML/32bit breaks because of this - since it is wise
enough to use PTRACE_OLDSETOPTIONS to be binary compatible with 2.4 host
kernels.

Until 2.6.17 (commit f0f2d6536e3515b5b1b7ae97dc8f176860c8c2ce) we had:

       default:
                return sys_ptrace(request, pid, addr, data);

Instead here we have:
        case PTRACE_GET_THREAD_AREA:
	case ...:
                return sys_ptrace(request, pid, addr, data);

        default:
                return -EINVAL;

This change was a style change - when a case is added, it must be explicitly
tested this way. In this case, not enough testing was done.

Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 arch/x86_64/ia32/ptrace32.c |    1 +
 1 file changed, 1 insertion(+)

--- linux-2.6.18.7.orig/arch/x86_64/ia32/ptrace32.c
+++ linux-2.6.18.7/arch/x86_64/ia32/ptrace32.c
@@ -239,6 +239,7 @@ asmlinkage long sys32_ptrace(long reques
 	case PTRACE_SINGLESTEP:
 	case PTRACE_DETACH:
 	case PTRACE_SYSCALL:
+	case PTRACE_OLDSETOPTIONS:
 	case PTRACE_SETOPTIONS:
 		return sys_ptrace(request, pid, addr, data); 
 

--

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