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Add a test to verify that a traced process sees its original parent via

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getppid() after a debugger process that is not the parent has attached.

Reviewed by:	kib (earlier version)
Differential Revision:	https://reviews.freebsd.org/D3615
This commit is contained in:
John Baldwin 2015-09-09 22:42:26 +00:00
parent 479b610db5
commit 368b2b1c76
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=287601
1 changed files with 87 additions and 0 deletions
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87
tests/sys/kern/ptrace_test.c
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@ -866,6 +866,92 @@ ATF_TC_BODY(ptrace__follow_fork_parent_detached_unrelated_debugger, tc)
ATF_REQUIRE(errno == ECHILD);
}
/*
* Verify that a child process does not see an unrelated debugger as its
* parent but sees its original parent process.
*/
ATF_TC_WITHOUT_HEAD(ptrace__getppid);
ATF_TC_BODY(ptrace__getppid, tc)
{
pid_t child, debugger, ppid, wpid;
int cpipe[2], dpipe[2], status;
char c;
ATF_REQUIRE(pipe(cpipe) == 0);
ATF_REQUIRE((child = fork()) != -1);
if (child == 0) {
/* Child process. */
close(cpipe[0]);
/* Wait for parent to be ready. */
CHILD_REQUIRE(read(cpipe[1], &c, sizeof(c)) == sizeof(c));
/* Report the parent PID to the parent. */
ppid = getppid();
CHILD_REQUIRE(write(cpipe[1], &ppid, sizeof(ppid)) ==
sizeof(ppid));
_exit(1);
}
close(cpipe[1]);
ATF_REQUIRE(pipe(dpipe) == 0);
ATF_REQUIRE((debugger = fork()) != -1);
if (debugger == 0) {
/* Debugger process. */
close(dpipe[0]);
CHILD_REQUIRE(ptrace(PT_ATTACH, child, NULL, 0) != -1);
wpid = waitpid(child, &status, 0);
CHILD_REQUIRE(wpid == child);
CHILD_REQUIRE(WIFSTOPPED(status));
CHILD_REQUIRE(WSTOPSIG(status) == SIGSTOP);
CHILD_REQUIRE(ptrace(PT_CONTINUE, child, (caddr_t)1, 0) != -1);
/* Signal parent that debugger is attached. */
CHILD_REQUIRE(write(dpipe[1], &c, sizeof(c)) == sizeof(c));
/* Wait for traced child to exit. */
wpid = waitpid(child, &status, 0);
CHILD_REQUIRE(wpid == child);
CHILD_REQUIRE(WIFEXITED(status));
CHILD_REQUIRE(WEXITSTATUS(status) == 1);
_exit(0);
}
close(dpipe[1]);
/* Parent process. */
/* Wait for the debugger to attach to the child. */
ATF_REQUIRE(read(dpipe[0], &c, sizeof(c)) == sizeof(c));
/* Release the child. */
ATF_REQUIRE(write(cpipe[0], &c, sizeof(c)) == sizeof(c));
/* Read the parent PID from the child. */
ATF_REQUIRE(read(cpipe[0], &ppid, sizeof(ppid)) == sizeof(ppid));
close(cpipe[0]);
ATF_REQUIRE(ppid == getpid());
/* Wait for the debugger. */
wpid = waitpid(debugger, &status, 0);
ATF_REQUIRE(wpid == debugger);
ATF_REQUIRE(WIFEXITED(status));
ATF_REQUIRE(WEXITSTATUS(status) == 0);
/* The child process should now be ready. */
wpid = waitpid(child, &status, WNOHANG);
ATF_REQUIRE(wpid == child);
ATF_REQUIRE(WIFEXITED(status));
ATF_REQUIRE(WEXITSTATUS(status) == 1);
}
ATF_TP_ADD_TCS(tp)
{
@ -881,6 +967,7 @@ ATF_TP_ADD_TCS(tp)
ptrace__follow_fork_child_detached_unrelated_debugger);
ATF_TP_ADD_TC(tp,
ptrace__follow_fork_parent_detached_unrelated_debugger);
ATF_TP_ADD_TC(tp, ptrace__getppid);
return (atf_no_error());
}