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* Copyright (c) 2024 Apple Inc. All rights reserved.
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*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
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*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
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*/
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <darwintest.h>
#include <darwintest_utils.h>
#define MAX_SUN_PATH (SOCK_MAXADDRLEN - offsetof(struct sockaddr_un, sun_path))
struct u_m_hdr {
uintptr_t mh_next; /* next buffer in chain */
uintptr_t mh_nextpkt; /* next chain in queue/record */
uintptr_t mh_data; /* location of data */
int32_t mh_len; /* amount of data in this mbuf */
u_int16_t mh_type; /* type of data in this mbuf */
u_int16_t mh_flags; /* flags; see below */
};
#define MLEN_OVERFLOW_OFSSET (256 - sizeof(struct u_m_hdr))
T_GLOBAL_META(
T_META_NAMESPACE("xnu.net"),
T_META_RADAR_COMPONENT_NAME("xnu"),
T_META_RADAR_COMPONENT_VERSION("networking")
);
T_DECL(sbconcat_mbufs_123249093, "test sbconcat_mbufs() overflow radar://123249093")
{
int pair[2] = { -1, -1 };
union {
uint8_t _buffer[SOCK_MAXADDRLEN];
struct sockaddr_un _sun;
} sun_;
struct sockaddr_un *sun = &sun_._sun;
struct u_m_hdr *mhdr;
ssize_t retval;
socklen_t address_len = SOCK_MAXADDRLEN;
snprintf(sun->sun_path, MAX_SUN_PATH, "/tmp/%s.%d", getprogname(), getpid());
mhdr = (struct u_m_hdr *)(void *)&sun_._buffer[MLEN_OVERFLOW_OFSSET];
mhdr->mh_next = (uintptr_t)0x4040404040404040ULL;
mhdr->mh_nextpkt = (uintptr_t)0x4141414141414141ULL;
mhdr->mh_data = (uintptr_t)0x4242424242424242ULL;
mhdr->mh_len = 0x43434343;
mhdr->mh_type = 0x4444;
mhdr->mh_flags = 0x4545;
T_LOG("sizeof(struct u_m_hdr): %lu ", sizeof(struct u_m_hdr));
T_LOG("MLEN_OVERFLOW_OFSSET: %lu ", MLEN_OVERFLOW_OFSSET);
T_LOG("sun_path: %s ", sun->sun_path);
/* add 1 for the end of string */
sun->sun_len = SOCK_MAXADDRLEN;
sun->sun_family = AF_LOCAL;
T_LOG("sun_len: %u sun_path: %s ", sun->sun_len, sun->sun_path);
(void)unlink(sun->sun_path);
T_ASSERT_POSIX_SUCCESS(socketpair(PF_LOCAL, SOCK_DGRAM, 0, pair), "socketpair");
T_LOG("pair[0]: %d pair[1]: %d", pair[0], pair[1]);
T_ASSERT_POSIX_SUCCESS(bind(pair[0], (struct sockaddr *)sun, sun->sun_len), "bind()");
if (getsockname(pair[0], (struct sockaddr *)sun, &address_len) == 0) {
T_LOG("getsockname(%d) OK, sun_len: %u sun_path: %s",
pair[0], sun->sun_len, sun->sun_path);
} else {
T_LOG("getsockname(%d) error %s (%d)",
pair[0], strerror(errno), errno);
}
/* The call may succeed or fail with ENOBUFS for CONFIG_MBUF_MCACHE */
retval = write(pair[0], NULL, 0);
T_ASSERT_TRUE((retval == 0 || errno == ENOBUFS), "write()");
close(pair[0]);
close(pair[1]);
(void)unlink(sun->sun_path);
}