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socket tests: Add a regression test for ktrace+recv(MSG_TRUNC)

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MFC after:	1 week
This commit is contained in:
Mark Johnston 2023-10-16 18:23:36 -04:00
parent b5e7dbac75
commit d8735eb7ac
1 changed files with 57 additions and 0 deletions
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57
tests/sys/kern/socket_msg_trunc.c
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@ -27,11 +27,13 @@
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/ktrace.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
@ -182,12 +184,67 @@ ATF_TC_BODY(recv_trunc_afunix_seqpacket, tc)
ATF_REQUIRE(close(ss) == 0);
}
/*
* Exercise the case where ktrace was used to dump a truncated buffer.
*/
ATF_TC_WITHOUT_HEAD(recvmsg_trunc_ktrace_uio);
ATF_TC_BODY(recvmsg_trunc_ktrace_uio, tc)
{
struct ktr_header ktr;
struct msghdr msg;
struct iovec iov;
const char *tracepath;
char buf[128];
ssize_t nbytes;
int error, fd, sd[2];
tracepath = "ktrace";
error = socketpair(AF_UNIX, SOCK_DGRAM, 0, sd);
ATF_REQUIRE(error == 0);
memset(buf, 0, sizeof(buf));
nbytes = send(sd[0], buf, sizeof(buf), 0);
ATF_REQUIRE_MSG(nbytes >= 0, "send failed: %s", strerror(errno));
ATF_REQUIRE((size_t)nbytes == sizeof(buf));
fd = open(tracepath, O_RDWR | O_CREAT | O_TRUNC, 0644);
ATF_REQUIRE_MSG(fd >= 0, "open failed: %s", strerror(errno));
error = ktrace(tracepath, KTROP_SET, KTRFAC_GENIO, getpid());
ATF_REQUIRE_MSG(error == 0,
"ktrace(SET) failed: %s", strerror(errno));
iov.iov_base = buf;
iov.iov_len = sizeof(buf) - 1; /* truncate */
memset(&msg, 0, sizeof(msg));
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
nbytes = recvmsg(sd[1], &msg, MSG_TRUNC);
ATF_REQUIRE_MSG(nbytes >= 0, "recvmsg failed: %s", strerror(errno));
ATF_REQUIRE((size_t)nbytes == sizeof(buf));
ATF_REQUIRE((msg.msg_flags & MSG_TRUNC) != 0);
error = ktrace(tracepath, KTROP_CLEARFILE, 0, getpid());
ATF_REQUIRE_MSG(error == 0,
"ktrace(CLEARFILE) failed: %s", strerror(errno));
nbytes = read(fd, &ktr, sizeof(ktr));
ATF_REQUIRE_MSG(nbytes >= 0, "read failed: %s", strerror(errno));
ATF_REQUIRE((size_t)nbytes == sizeof(ktr));
ATF_REQUIRE_MSG((ktr.ktr_type & ~KTR_TYPE) == KTR_GENIO);
ATF_REQUIRE(close(fd) == 0);
ATF_REQUIRE(close(sd[0]) == 0);
ATF_REQUIRE(close(sd[1]) == 0);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, recv_trunc_afinet_udp);
ATF_TP_ADD_TC(tp, recv_trunc_afinet6_udp);
ATF_TP_ADD_TC(tp, recv_trunc_afunix_dgram);
ATF_TP_ADD_TC(tp, recv_trunc_afunix_seqpacket);
ATF_TP_ADD_TC(tp, recvmsg_trunc_ktrace_uio);
return (atf_no_error());
}