diff options
author | Roland McGrath <roland@redhat.com> | 2008-01-30 13:31:48 +0100 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:31:48 +0100 |
commit | c269f19617f508cc5c29c0b064c1a437d7011a46 (patch) | |
tree | da49abc09dcf573df0580b305dba647a70306ac8 /kernel/ptrace.c | |
parent | 032d82d9065dec0e26718eca376c2029e4bd0595 (diff) | |
download | linux-c269f19617f508cc5c29c0b064c1a437d7011a46.tar.bz2 |
x86: compat_sys_ptrace
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>
Diffstat (limited to 'kernel/ptrace.c')
-rw-r--r-- | kernel/ptrace.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index ed1c3d56c2cd..e6e9b8be4b05 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -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 */ |