linux-kernel - [PATCH] x86 ptrace: fix PTRACE

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Message-Id: <20080630210241.93738154077@magilla.localdomain>
Date:	Mon, 30 Jun 2008 14:02:41 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>
Cc:	TAKADA Yoshihito <takada@....nifty.com>
Subject: [PATCH] x86 ptrace: fix PTRACE_GETFPXREGS error

ptrace has always returned only -EIO for all failures to access
registers.  The user_regset calls are allowed to return a more
meaningful variety of errors.  The REGSET_XFP calls use -ENODEV
for !cpu_has_fxsr hardware.  Make ptrace return the traditional
-EIO instead of the error code from the user_regset call.

Signed-off-by: Roland McGrath <roland@...hat.com>
---
 arch/x86/kernel/ptrace.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index a7835f2..77040b6 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -943,13 +943,13 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 		return copy_regset_to_user(child, &user_x86_32_view,
 					   REGSET_XFP,
 					   0, sizeof(struct user_fxsr_struct),
-					   datap);
+					   datap) ? -EIO : 0;
 
 	case PTRACE_SETFPXREGS:	/* Set the child extended FPU state. */
 		return copy_regset_from_user(child, &user_x86_32_view,
 					     REGSET_XFP,
 					     0, sizeof(struct user_fxsr_struct),
-					     datap);
+					     datap) ? -EIO : 0;
 #endif
 
 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
--
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