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/* $NetBSD: t_ptrace_core_wait.h,v 1.7 2022/06/09 17:39:21 skrll Exp $ */
/*-
* Copyright (c) 2016, 2017, 2018, 2019, 2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Parse the core file and find the requested note. If the reading or parsing
* fails, the test is failed. If the note is found, it is read onto buf, up to
* buf_len. The actual length of the note is returned (which can be greater
* than buf_len, indicating that it has been truncated). If the note is not
* found, -1 is returned.
*
* If the note_name ends in '*', then we find the first note that matches
* the note_name prefix up to the '*' character, e.g.:
*
* NetBSD-CORE@*
*
* finds the first note whose name prefix matches "NetBSD-CORE@".
*/
static ssize_t core_find_note(const char *core_path,
const char *note_name, uint64_t note_type, void *buf, size_t buf_len)
{
int core_fd;
Elf *core_elf;
size_t core_numhdr, i;
ssize_t ret = -1;
size_t name_len = strlen(note_name);
bool prefix_match = false;
if (note_name[name_len - 1] == '*') {
prefix_match = true;
name_len--;
} else {
/* note: we assume note name will be null-terminated */
name_len++;
}
SYSCALL_REQUIRE((core_fd = open(core_path, O_RDONLY)) != -1);
SYSCALL_REQUIRE(elf_version(EV_CURRENT) != EV_NONE);
SYSCALL_REQUIRE((core_elf = elf_begin(core_fd, ELF_C_READ, NULL)));
SYSCALL_REQUIRE(elf_getphnum(core_elf, &core_numhdr) != 0);
for (i = 0; i < core_numhdr && ret == -1; i++) {
GElf_Phdr core_hdr;
size_t offset;
SYSCALL_REQUIRE(gelf_getphdr(core_elf, i, &core_hdr));
if (core_hdr.p_type != PT_NOTE)
continue;
for (offset = core_hdr.p_offset;
offset < core_hdr.p_offset + core_hdr.p_filesz;) {
Elf64_Nhdr note_hdr;
char name_buf[64];
switch (gelf_getclass(core_elf)) {
case ELFCLASS64:
SYSCALL_REQUIRE(pread(core_fd, ¬e_hdr,
sizeof(note_hdr), offset)
== sizeof(note_hdr));
offset += sizeof(note_hdr);
break;
case ELFCLASS32:
{
Elf32_Nhdr tmp_hdr;
SYSCALL_REQUIRE(pread(core_fd, &tmp_hdr,
sizeof(tmp_hdr), offset)
== sizeof(tmp_hdr));
offset += sizeof(tmp_hdr);
note_hdr.n_namesz = tmp_hdr.n_namesz;
note_hdr.n_descsz = tmp_hdr.n_descsz;
note_hdr.n_type = tmp_hdr.n_type;
}
break;
}
/* indicates end of notes */
if (note_hdr.n_namesz == 0 || note_hdr.n_descsz == 0)
break;
if (((prefix_match &&
note_hdr.n_namesz > name_len) ||
(!prefix_match &&
note_hdr.n_namesz == name_len)) &&
note_hdr.n_namesz <= sizeof(name_buf)) {
SYSCALL_REQUIRE(pread(core_fd, name_buf,
note_hdr.n_namesz, offset)
== (ssize_t)(size_t)note_hdr.n_namesz);
if (!strncmp(note_name, name_buf, name_len) &&
note_hdr.n_type == note_type)
ret = note_hdr.n_descsz;
}
offset += note_hdr.n_namesz;
/* fix to alignment */
offset = roundup(offset, core_hdr.p_align);
/* if name & type matched above */
if (ret != -1) {
ssize_t read_len = MIN(buf_len,
note_hdr.n_descsz);
SYSCALL_REQUIRE(pread(core_fd, buf,
read_len, offset) == read_len);
break;
}
offset += note_hdr.n_descsz;
/* fix to alignment */
offset = roundup(offset, core_hdr.p_align);
}
}
elf_end(core_elf);
close(core_fd);
return ret;
}
ATF_TC(core_dump_procinfo);
ATF_TC_HEAD(core_dump_procinfo, tc)
{
atf_tc_set_md_var(tc, "descr",
"Trigger a core dump and verify its contents.");
}
ATF_TC_BODY(core_dump_procinfo, tc)
{
const int exitval = 5;
pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
const int sigval = SIGTRAP;
int status;
#endif
char core_path[] = "/tmp/core.XXXXXX";
int core_fd;
struct netbsd_elfcore_procinfo procinfo;
DPRINTF("Before forking process PID=%d\n", getpid());
SYSCALL_REQUIRE((child = fork()) != -1);
if (child == 0) {
DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
DPRINTF("Before triggering SIGTRAP\n");
trigger_trap();
DPRINTF("Before exiting of the child process\n");
_exit(exitval);
}
DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);
DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
validate_status_stopped(status, sigval);
SYSCALL_REQUIRE((core_fd = mkstemp(core_path)) != -1);
close(core_fd);
DPRINTF("Call DUMPCORE for the child process\n");
SYSCALL_REQUIRE(ptrace(PT_DUMPCORE, child, core_path, strlen(core_path))
!= -1);
DPRINTF("Read core file\n");
ATF_REQUIRE_EQ(core_find_note(core_path, "NetBSD-CORE",
ELF_NOTE_NETBSD_CORE_PROCINFO, &procinfo, sizeof(procinfo)),
sizeof(procinfo));
ATF_CHECK_EQ(procinfo.cpi_version, 1);
ATF_CHECK_EQ(procinfo.cpi_cpisize, sizeof(procinfo));
ATF_CHECK_EQ(procinfo.cpi_signo, SIGTRAP);
ATF_CHECK_EQ(procinfo.cpi_pid, child);
ATF_CHECK_EQ(procinfo.cpi_ppid, getpid());
ATF_CHECK_EQ(procinfo.cpi_pgrp, getpgid(child));
ATF_CHECK_EQ(procinfo.cpi_sid, getsid(child));
ATF_CHECK_EQ(procinfo.cpi_ruid, getuid());
ATF_CHECK_EQ(procinfo.cpi_euid, geteuid());
ATF_CHECK_EQ(procinfo.cpi_rgid, getgid());
ATF_CHECK_EQ(procinfo.cpi_egid, getegid());
ATF_CHECK_EQ(procinfo.cpi_nlwps, 1);
ATF_CHECK(procinfo.cpi_siglwp > 0);
unlink(core_path);
DPRINTF("Before resuming the child process where it left off and "
"without signal to be sent\n");
#if defined(__aarch64__) || defined(__arm__) || defined(__hppa__) || \
defined(__powerpc__) || defined(__sh3__) || defined(sparc)
/*
* For these archs, program counter is not automatically incremented
* by a trap instruction. We cannot increment PC in the trap handler,
* which breaks applications depending on this behavior, e.g., GDB.
* Therefore, we need to pass PC++ instead of (void *)1 (== PC) to
* PT_CONTINUE here.
*/
struct reg r;
SYSCALL_REQUIRE(ptrace(PT_GETREGS, child, &r, 0) != -1);
SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child,
(void *)(PTRACE_REG_PC(&r) + PTRACE_BREAKPOINT_SIZE), 0) != -1);
#else
SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
#endif
DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
validate_status_exited(status, exitval);
DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}
#define ATF_TP_ADD_TCS_PTRACE_WAIT_CORE() \
ATF_TP_ADD_TC(tp, core_dump_procinfo);
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