diff options
Diffstat (limited to 'arch/m68k/kernel/ptrace.c')
| -rw-r--r-- | arch/m68k/kernel/ptrace.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/m68k/kernel/ptrace.c b/arch/m68k/kernel/ptrace.c index 9888d83c1..5aeb2534b 100644 --- a/arch/m68k/kernel/ptrace.c +++ b/arch/m68k/kernel/ptrace.c @@ -325,12 +325,15 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data) ret = 0; goto out; } - if (pid == 1) /* you may not mess with init */ - goto out; ret = -ESRCH; - if (!(child = find_task_by_pid(pid))) + read_lock(&tasklist_lock); + child = find_task_by_pid(pid); + read_unlock(&tasklist_lock); /* FIXME!!! */ + if (!child) goto out; ret = -EPERM; + if (pid == 1) /* you may not mess with init */ + goto out; if (request == PTRACE_ATTACH) { if (child == current) goto out; @@ -375,7 +378,9 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data) case PTRACE_PEEKDATA: { unsigned long tmp; + down(&child->mm->mmap_sem); ret = read_long(child, addr, &tmp); + up(&child->mm->mmap_sem); if (ret >= 0) ret = put_user(tmp, (unsigned long *) data); goto out; @@ -408,7 +413,9 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data) /* when I and D space are separate, this will have to be fixed. */ case PTRACE_POKETEXT: /* write the word at location addr. */ case PTRACE_POKEDATA: + down(&child->mm->mmap_sem); ret = write_long(child,addr,data); + up(&child->mm->mmap_sem); goto out; case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |