On Wed, Dec 19, 2007 at 04:54:30PM +1100, David Chinner wrote:
> [ 5667.086055] BUG: sleeping function called from invalid context at kernel/fork.c:401
>
The problem is that mmput is called under the read_lock by
find_thread_for_addr... The comment above seems to indicate that gdb
needs to be able to access any child tasks register backing store
memory... This seems pretty broken.
cheers, Kyle
---
Who knows, maybe gdb is saner now?
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 2e96f17..b609704 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -1418,7 +1418,7 @@ asmlinkage long
sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
{
struct pt_regs *pt;
- unsigned long urbs_end, peek_or_poke;
+ unsigned long urbs_end;
struct task_struct *child;
struct switch_stack *sw;
long ret;
@@ -1430,23 +1430,12 @@ sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
goto out;
}
- peek_or_poke = (request == PTRACE_PEEKTEXT
- || request == PTRACE_PEEKDATA
- || request == PTRACE_POKETEXT
- || request == PTRACE_POKEDATA);
- ret = -ESRCH;
- read_lock(&tasklist_lock);
- {
- child = find_task_by_pid(pid);
- if (child) {
- if (peek_or_poke)
- child = find_thread_for_addr(child, addr);
- get_task_struct(child);
- }
- }
- read_unlock(&tasklist_lock);
- if (!child)
+ child = ptrace_get_task_struct(pid);
+ if (IS_ERR(child)) {
+ ret = PTR_ERR(child);
goto out;
+ }
+
ret = -EPERM;
if (pid == 1) /* no messing around with init! */
goto out_tsk;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
