From f0f2d6536e3515b5b1b7ae97dc8f176860c8c2ce Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@suse.de>
Date: Mon, 26 Jun 2006 13:56:34 +0200
Subject: [PATCH] [PATCH] x86_64: Implement compat functions for
 PTRACE_SETSIGINFO/GETSIGINFO

Previously we would just silently provide 64 bit services
for this to 32bit processes.

I also added all the other cases explicitely to the ptrace
compat wrapper to make sure this doesn't happen again.

And removed one bogus check in the wrapper.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 arch/x86_64/ia32/ptrace32.c | 41 +++++++++++++++++++++++++++++++------
 1 file changed, 35 insertions(+), 6 deletions(-)

diff --git a/arch/x86_64/ia32/ptrace32.c b/arch/x86_64/ia32/ptrace32.c
index 23a4515a73b4..4defe63f5916 100644
--- a/arch/x86_64/ia32/ptrace32.c
+++ b/arch/x86_64/ia32/ptrace32.c
@@ -27,6 +27,7 @@
 #include <asm/debugreg.h>
 #include <asm/i387.h>
 #include <asm/fpu32.h>
+#include <asm/ia32.h>
 
 /*
  * Determines which flags the user has access to [1 = access, 0 = no access].
@@ -199,6 +200,24 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
 
 #undef R32
 
+static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
+{
+	int ret;
+	compat_siginfo_t *si32 = (compat_siginfo_t *)compat_ptr(data);
+	siginfo_t *si = compat_alloc_user_space(sizeof(siginfo_t));
+	if (request == PTRACE_SETSIGINFO) {
+		ret = copy_siginfo_from_user32(si, si32);
+		if (ret)
+			return ret;
+	}
+	ret = sys_ptrace(request, pid, addr, (unsigned long)si);
+	if (ret)
+		return ret;
+	if (request == PTRACE_GETSIGINFO)
+		ret = copy_siginfo_to_user32(si32, si);
+	return ret;
+}
+
 asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
 {
 	struct task_struct *child;
@@ -208,9 +227,19 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
 	__u32 val;
 
 	switch (request) { 
-	default:
+	case PTRACE_TRACEME:
+	case PTRACE_ATTACH:
+	case PTRACE_KILL:
+	case PTRACE_CONT:
+	case PTRACE_SINGLESTEP:
+	case PTRACE_DETACH:
+	case PTRACE_SYSCALL:
+	case PTRACE_SETOPTIONS:
 		return sys_ptrace(request, pid, addr, data); 
 
+	default:
+		return -EINVAL;
+
 	case PTRACE_PEEKTEXT:
 	case PTRACE_PEEKDATA:
 	case PTRACE_POKEDATA:
@@ -225,10 +254,11 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
 	case PTRACE_GETFPXREGS:
 	case PTRACE_GETEVENTMSG:
 		break;
-	} 
 
-	if (request == PTRACE_TRACEME)
-		return ptrace_traceme();
+	case PTRACE_SETSIGINFO:
+	case PTRACE_GETSIGINFO:
+		return ptrace32_siginfo(request, pid, addr, data);
+	}
 
 	child = ptrace_get_task_struct(pid);
 	if (IS_ERR(child))
@@ -349,8 +379,7 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
 		break;
 
 	default:
-		ret = -EINVAL;
-		break;
+		BUG();
 	}
 
  out:
-- 
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