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sys.kern.pdeathsig.signal_delivered_ptrace: fix startup.

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Inform D that C executed procctl(PROC_PDEATHSIG_CTL).  Otherwise D
might allow B to exit before C is set up to receive a signal on the
parent exit.  In this case, C waits forever for the signal and test
hangs.

PR:	237657
Reported and tested by:	lwhsu
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2019-08-19 09:33:09 +00:00
parent 39ba52c0b7
commit de567a4bef
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=351211
1 changed files with 9 additions and 0 deletions
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9
tests/sys/kern/pdeathsig.c
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@ -229,6 +229,7 @@ ATF_TC_BODY(signal_delivered_ptrace, tc)
int rc;
int pipe_ca[2];
int pipe_db[2];
int pipe_cd[2];
char buffer;
int status;
@ -236,6 +237,8 @@ ATF_TC_BODY(signal_delivered_ptrace, tc)
ATF_REQUIRE(rc == 0);
rc = pipe(pipe_db);
ATF_REQUIRE(rc == 0);
rc = pipe(pipe_cd);
assert(rc == 0);
rc = fork();
ATF_REQUIRE(rc != -1);
@ -263,6 +266,9 @@ ATF_TC_BODY(signal_delivered_ptrace, tc)
rc = procctl(P_PID, 0, PROC_PDEATHSIG_CTL, &signum);
assert(rc == 0);
rc = write(pipe_cd[1], "x", 1);
assert(rc == 1);
/* wait for B to die and signal us... */
signum = 0xdeadbeef;
rc = sigwait(&sigset, &signum);
@ -293,6 +299,9 @@ ATF_TC_BODY(signal_delivered_ptrace, tc)
rc = ptrace(PT_CONTINUE, c_pid, (caddr_t) 1, 0);
assert(rc == 0);
rc = read(pipe_cd[0], &buffer, 1);
assert(rc == 1);
/* tell B that we're ready for it to exit now */
rc = write(pipe_db[1], ".", 1);
assert(rc == 1);