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ptrace: cleanup arch_ptrace() on um

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Remove unnecessary castings using void pointer and fix copy_to_user()
return value. Also add missing __user markup on the argument of
arch_ptrctl().

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Namhyung Kim 2010-10-27 15:34:04 -07:00 committed by Linus Torvalds
parent 8c0acac367
commit 0a3d763f1a
2 changed files with 11 additions and 14 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

18
arch/um/kernel/ptrace.c
View file

@ -47,6 +47,7 @@ long arch_ptrace(struct task_struct *child, long request,
{
int i, ret;
unsigned long __user *p = (void __user *)data;
void __user *vp = p;
switch (request) {
/* read word at location addr. */
@ -108,24 +109,20 @@ long arch_ptrace(struct task_struct *child, long request,
#endif
#ifdef PTRACE_GETFPREGS
case PTRACE_GETFPREGS: /* Get the child FPU state. */
ret = get_fpregs((struct user_i387_struct __user *) data,
child);
ret = get_fpregs(vp, child);
break;
#endif
#ifdef PTRACE_SETFPREGS
case PTRACE_SETFPREGS: /* Set the child FPU state. */
ret = set_fpregs((struct user_i387_struct __user *) data,
child);
ret = set_fpregs(vp, child);
break;
#endif
case PTRACE_GET_THREAD_AREA:
ret = ptrace_get_thread_area(child, addr,
(struct user_desc __user *) data);
ret = ptrace_get_thread_area(child, addr, vp);
break;
case PTRACE_SET_THREAD_AREA:
ret = ptrace_set_thread_area(child, addr,
(struct user_desc __user *) data);
ret = ptrace_set_thread_area(child, addr, datavp);
break;
case PTRACE_FAULTINFO: {
@ -135,7 +132,8 @@ long arch_ptrace(struct task_struct *child, long request,
* On i386, ptrace_faultinfo is smaller!
*/
ret = copy_to_user(p, &child->thread.arch.faultinfo,
sizeof(struct ptrace_faultinfo));
sizeof(struct ptrace_faultinfo)) ?
-EIO : 0;
break;
}
@ -159,7 +157,7 @@ long arch_ptrace(struct task_struct *child, long request,
#ifdef PTRACE_ARCH_PRCTL
case PTRACE_ARCH_PRCTL:
/* XXX Calls ptrace on the host - needs some SMP thinking */
ret = arch_prctl(child, data, (void *) addr);
ret = arch_prctl(child, data, (void __user *) addr);
break;
#endif
default:

7
arch/um/sys-x86_64/ptrace.c
View file

@ -179,15 +179,14 @@ long subarch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
int ret = -EIO;
void __user *datap = (void __user *) data;
switch (request) {
case PTRACE_GETFPXREGS: /* Get the child FPU state. */
ret = get_fpregs((struct user_i387_struct __user *) data,
child);
ret = get_fpregs(datap, child);
break;
case PTRACE_SETFPXREGS: /* Set the child FPU state. */
ret = set_fpregs((struct user_i387_struct __user *) data,
child);
ret = set_fpregs(datap, child);
break;
}