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2008-03-25 Roland McGrath <roland@redhat.com>

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* structs.def: Add pid field of struct pthread.
	* td_ta_thr_iter.c (iterate_thread_list): Take new arg MATCH_PID.
	If a thread's pid does not match nor is < 0 while its tid matches
	nor is < 0 and equal to -MATCH_PID, ignore it.
	* td_thr_validate.c (td_thr_validate): Validate thread's pid/tid.
This commit is contained in:
Roland McGrath
2008-03-26 08:21:10 +00:00
parent 87b9b50f0d
commit d11dc9ecb7
3 changed files with 73 additions and 27 deletions
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26
nptl_db/td_thr_validate.c
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@@ -1,5 +1,6 @@
/* Validate a thread handle.
Copyright (C) 1999,2001,2002,2003,2004,2007 Free Software Foundation, Inc.
Copyright (C) 1999,2001,2002,2003,2004,2007,2008
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@@ -81,5 +82,28 @@ td_thr_validate (const td_thrhandle_t *th)
err = TD_OK;
}
if (err == TD_OK)
{
/* Verify that this is not a stale element in a fork child. */
pid_t match_pid = ps_getpid (th->th_ta_p->ph);
psaddr_t pid;
err = DB_GET_FIELD (pid, th->th_ta_p, th->th_unique, pthread, pid, 0);
if (err == TD_OK && (pid_t) (uintptr_t) pid < 0)
{
/* This was a thread that was about to fork, or it is the new sole
thread in a fork child. In the latter case, its tid was stored
via CLONE_CHILD_SETTID and so is already the proper child PID. */
if (-(pid_t) (uintptr_t) pid == match_pid)
/* It is about to do a fork, but is really still the parent PID. */
pid = (psaddr_t) (uintptr_t) match_pid;
else
/* It must be a fork child, whose new PID is in the tid field. */
err = DB_GET_FIELD (pid, th->th_ta_p, th->th_unique,
pthread, tid, 0);
}
if (err == TD_OK && (pid_t) (uintptr_t) pid != match_pid)
err = TD_NOTHR;
}
return err;
}