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| author | Konstantin Belousov <kib@FreeBSD.org> | 2021-04-23 13:26:01 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2021-05-10 01:03:06 +0000 |
| commit | 51af25060861869b9ba59601eb67eae2445e61e0 (patch) | |
| tree | b6cc1a4ad228370decc213c137e021aa15667a0f /sys/kern/kern_sig.c | |
| parent | 2b348ecde121f57020addd77d59a1b79b8046c79 (diff) | |
| download | src-51af25060861869b9ba59601eb67eae2445e61e0.tar.gz src-51af25060861869b9ba59601eb67eae2445e61e0.zip | |
Add ptrace(PT_COREDUMP)
(cherry picked from commit 87a64872cd3166a09b58aac28cdb95380d6a38eb)
Diffstat (limited to 'sys/kern/kern_sig.c')
| -rw-r--r-- | sys/kern/kern_sig.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c index 445582a176c8..0453d3b2702c 100644 --- a/sys/kern/kern_sig.c +++ b/sys/kern/kern_sig.c @@ -2521,6 +2521,42 @@ out: thread_unlock(td); } +static void +ptrace_coredump(struct thread *td) +{ + struct proc *p; + struct thr_coredump_req *tcq; + void *rl_cookie; + + MPASS(td == curthread); + p = td->td_proc; + PROC_LOCK_ASSERT(p, MA_OWNED); + if ((td->td_dbgflags & TDB_COREDUMPRQ) == 0) + return; + KASSERT((p->p_flag & P_STOPPED_TRACE) != 0, ("not stopped")); + + tcq = td->td_coredump; + KASSERT(tcq != NULL, ("td_coredump is NULL")); + + if (p->p_sysent->sv_coredump == NULL) { + tcq->tc_error = ENOSYS; + goto wake; + } + + PROC_UNLOCK(p); + rl_cookie = vn_rangelock_wlock(tcq->tc_vp, 0, OFF_MAX); + + tcq->tc_error = p->p_sysent->sv_coredump(td, tcq->tc_vp, + tcq->tc_limit, tcq->tc_flags); + + vn_rangelock_unlock(tcq->tc_vp, rl_cookie); + PROC_LOCK(p); +wake: + td->td_dbgflags &= ~TDB_COREDUMPRQ; + td->td_coredump = NULL; + wakeup(p); +} + static int sig_suspend_threads(struct thread *td, struct proc *p, int sending) { @@ -2651,6 +2687,12 @@ stopme: td->td_dbgflags |= TDB_SSWITCH; thread_suspend_switch(td, p); td->td_dbgflags &= ~TDB_SSWITCH; + if ((td->td_dbgflags & TDB_COREDUMPRQ) != 0) { + PROC_SUNLOCK(p); + ptrace_coredump(td); + PROC_SLOCK(p); + goto stopme; + } if (p->p_xthread == td) p->p_xthread = NULL; if (!(p->p_flag & P_TRACED)) |