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x86: compat_sys_ptrace

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This adds a generic definition of compat_sys_ptrace that calls
compat_arch_ptrace, parallel to sys_ptrace/arch_ptrace.  Some
machines needing this already define a function by that name.
The new generic function is defined only on machines that
put #define __ARCH_WANT_COMPAT_SYS_PTRACE into asm/ptrace.h.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Roland McGrath 2008-01-30 13:31:48 +01:00 committed by Ingo Molnar
parent 032d82d906
commit c269f19617
2 changed files with 53 additions and 0 deletions
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7
include/linux/compat.h
View file

@ -247,6 +247,13 @@ extern int compat_ptrace_request(struct task_struct *child,
compat_long_t request,
compat_ulong_t addr, compat_ulong_t data);
#ifdef __ARCH_WANT_COMPAT_SYS_PTRACE
extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t addr, compat_ulong_t data);
asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
compat_long_t addr, compat_long_t data);
#endif /* __ARCH_WANT_COMPAT_SYS_PTRACE */
/*
* epoll (fs/eventpoll.c) compat bits follow ...
*/

46
kernel/ptrace.c
View file

@ -644,4 +644,50 @@ int compat_ptrace_request(struct task_struct *child, compat_long_t request,
return ret;
}
#ifdef __ARCH_WANT_COMPAT_SYS_PTRACE
asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
compat_long_t addr, compat_long_t data)
{
struct task_struct *child;
long ret;
/*
* This lock_kernel fixes a subtle race with suid exec
*/
lock_kernel();
if (request == PTRACE_TRACEME) {
ret = ptrace_traceme();
goto out;
}
child = ptrace_get_task_struct(pid);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
goto out;
}
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);
/*
* Some architectures need to do book-keeping after
* a ptrace attach.
*/
if (!ret)
arch_ptrace_attach(child);
goto out_put_task_struct;
}
ret = ptrace_check_attach(child, request == PTRACE_KILL);
if (!ret)
ret = compat_arch_ptrace(child, request, addr, data);
out_put_task_struct:
put_task_struct(child);
out:
unlock_kernel();
return ret;
}
#endif /* __ARCH_WANT_COMPAT_SYS_PTRACE */
#endif /* CONFIG_COMPAT */