diff options
| author | Roland McGrath | 2008-01-30 13:31:47 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2008-01-30 13:31:47 +0100 |
| commit | 032d82d9065dec0e26718eca376c2029e4bd0595 (patch) | |
| tree | 44cdb3296f25a9b2d5044fe1c12fbb03b085ac37 | |
| parent | 16c3e389e7a7254ff8dc7029ac4fbe996c3c75bf (diff) | |
x86: compat_ptrace_request
This adds a compat_ptrace_request that is the analogue of ptrace_request
for the things that 32-on-64 ptrace implementations can share in common.
So far there are just a couple of requests handled generically.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | include/linux/compat.h | 4 | ||||
| -rw-r--r-- | kernel/ptrace.c | 38 |
2 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/compat.h b/include/linux/compat.h index ba29d4c59643..a907fbede6c3 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -243,6 +243,10 @@ asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes, const compat_ulong_t __user *new_nodes); +extern int compat_ptrace_request(struct task_struct *child, + compat_long_t request, + compat_ulong_t addr, compat_ulong_t data); + /* * epoll (fs/eventpoll.c) compat bits follow ... */ diff --git a/kernel/ptrace.c b/kernel/ptrace.c index e6a99d2793b3..ed1c3d56c2cd 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -607,3 +607,41 @@ int generic_ptrace_pokedata(struct task_struct *tsk, long addr, long data) copied = access_process_vm(tsk, addr, &data, sizeof(data), 1); return (copied == sizeof(data)) ? 0 : -EIO; } + +#ifdef CONFIG_COMPAT +#include <linux/compat.h> + +int compat_ptrace_request(struct task_struct *child, compat_long_t request, + compat_ulong_t addr, compat_ulong_t data) +{ + compat_ulong_t __user *datap = compat_ptr(data); + compat_ulong_t word; + int ret; + + switch (request) { + case PTRACE_PEEKTEXT: + case PTRACE_PEEKDATA: + ret = access_process_vm(child, addr, &word, sizeof(word), 0); + if (ret != sizeof(word)) + ret = -EIO; + else + ret = put_user(word, datap); + break; + + case PTRACE_POKETEXT: + case PTRACE_POKEDATA: + ret = access_process_vm(child, addr, &data, sizeof(data), 1); + ret = (ret != sizeof(data) ? -EIO : 0); + break; + + case PTRACE_GETEVENTMSG: + ret = put_user((compat_ulong_t) child->ptrace_message, datap); + break; + + default: + ret = ptrace_request(child, request, addr, data); + } + + return ret; +} +#endif /* CONFIG_COMPAT */ |