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x86 ptrace: fix PTRACE_GETFPXREGS error

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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@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Roland McGrath 2008-06-30 14:02:41 -07:00 committed by Ingo Molnar
parent e1441b9a41
commit 45fdc3a762
2 changed files with 4 additions and 4 deletions
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4
arch/x86/kernel/i387.c
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@ -162,7 +162,7 @@ int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
int ret;
if (!cpu_has_fxsr)
return -EIO;
return -ENODEV;
ret = init_fpu(target);
if (ret)
@ -179,7 +179,7 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
int ret;
if (!cpu_has_fxsr)
return -EIO;
return -ENODEV;
ret = init_fpu(target);
if (ret)

4
arch/x86/kernel/ptrace.c
View File

@ -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