proc: test /proc/*/maps, smaps, smaps_rollup, statm
Start testing VM related fiels found in per-process files. Do it by jiting small executable which brings its address space to precisely known state, then comparing /proc/*/maps, smaps, smaps_rollup, and statm files to expected values. Currently only x86_64 is supported. [adobriyan@gmail.com: exit correctly in /proc/*/maps test] Link: http://lkml.kernel.org/r/20190206073659.GB15311@avx2 Link: http://lkml.kernel.org/r/20190203165806.GA14568@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan
Linus Torvalds
parent
08b5577513
commit
e483b02087
|
|
@ -2,6 +2,7 @@
|
|||
/fd-002-posix-eq
|
||||
/fd-003-kthread
|
||||
/proc-loadavg-001
|
||||
/proc-pid-vm
|
||||
/proc-self-map-files-001
|
||||
/proc-self-map-files-002
|
||||
/proc-self-syscall
|
||||
|
|
|
|||
|
|
@ -6,6 +6,7 @@ TEST_GEN_PROGS += fd-001-lookup
|
|||
TEST_GEN_PROGS += fd-002-posix-eq
|
||||
TEST_GEN_PROGS += fd-003-kthread
|
||||
TEST_GEN_PROGS += proc-loadavg-001
|
||||
TEST_GEN_PROGS += proc-pid-vm
|
||||
TEST_GEN_PROGS += proc-self-map-files-001
|
||||
TEST_GEN_PROGS += proc-self-map-files-002
|
||||
TEST_GEN_PROGS += proc-self-syscall
|
||||
|
|
|
|||
|
|
@ -0,0 +1,406 @@
|
|||
/*
|
||||
* Copyright (c) 2019 Alexey Dobriyan <adobriyan@gmail.com>
|
||||
*
|
||||
* Permission to use, copy, modify, and distribute this software for any
|
||||
* purpose with or without fee is hereby granted, provided that the above
|
||||
* copyright notice and this permission notice appear in all copies.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||||
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||||
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||||
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||||
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||||
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||||
*/
|
||||
/*
|
||||
* Fork and exec tiny 1 page executable which precisely controls its VM.
|
||||
* Test /proc/$PID/maps
|
||||
* Test /proc/$PID/smaps
|
||||
* Test /proc/$PID/smaps_rollup
|
||||
* Test /proc/$PID/statm
|
||||
*
|
||||
* FIXME require CONFIG_TMPFS which can be disabled
|
||||
* FIXME test other values from "smaps"
|
||||
* FIXME support other archs
|
||||
*/
|
||||
#undef NDEBUG
|
||||
#include <assert.h>
|
||||
#include <errno.h>
|
||||
#include <sched.h>
|
||||
#include <signal.h>
|
||||
#include <stdint.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#include <stdlib.h>
|
||||
#include <sys/mount.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
#include <sys/syscall.h>
|
||||
#include <sys/uio.h>
|
||||
#include <linux/kdev_t.h>
|
||||
|
||||
static inline long sys_execveat(int dirfd, const char *pathname, char **argv, char **envp, int flags)
|
||||
{
|
||||
return syscall(SYS_execveat, dirfd, pathname, argv, envp, flags);
|
||||
}
|
||||
|
||||
static void make_private_tmp(void)
|
||||
{
|
||||
if (unshare(CLONE_NEWNS) == -1) {
|
||||
if (errno == ENOSYS || errno == EPERM) {
|
||||
exit(4);
|
||||
}
|
||||
exit(1);
|
||||
}
|
||||
if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) {
|
||||
exit(1);
|
||||
}
|
||||
if (mount(NULL, "/tmp", "tmpfs", 0, NULL) == -1) {
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
static pid_t pid = -1;
|
||||
static void ate(void)
|
||||
{
|
||||
if (pid > 0) {
|
||||
kill(pid, SIGTERM);
|
||||
}
|
||||
}
|
||||
|
||||
struct elf64_hdr {
|
||||
uint8_t e_ident[16];
|
||||
uint16_t e_type;
|
||||
uint16_t e_machine;
|
||||
uint32_t e_version;
|
||||
uint64_t e_entry;
|
||||
uint64_t e_phoff;
|
||||
uint64_t e_shoff;
|
||||
uint32_t e_flags;
|
||||
uint16_t e_ehsize;
|
||||
uint16_t e_phentsize;
|
||||
uint16_t e_phnum;
|
||||
uint16_t e_shentsize;
|
||||
uint16_t e_shnum;
|
||||
uint16_t e_shstrndx;
|
||||
};
|
||||
|
||||
struct elf64_phdr {
|
||||
uint32_t p_type;
|
||||
uint32_t p_flags;
|
||||
uint64_t p_offset;
|
||||
uint64_t p_vaddr;
|
||||
uint64_t p_paddr;
|
||||
uint64_t p_filesz;
|
||||
uint64_t p_memsz;
|
||||
uint64_t p_align;
|
||||
};
|
||||
|
||||
#ifdef __x86_64__
|
||||
#define PAGE_SIZE 4096
|
||||
#define VADDR (1UL << 32)
|
||||
#define MAPS_OFFSET 73
|
||||
|
||||
#define syscall 0x0f, 0x05
|
||||
#define mov_rdi(x) \
|
||||
0x48, 0xbf, \
|
||||
(x)&0xff, ((x)>>8)&0xff, ((x)>>16)&0xff, ((x)>>24)&0xff, \
|
||||
((x)>>32)&0xff, ((x)>>40)&0xff, ((x)>>48)&0xff, ((x)>>56)&0xff
|
||||
|
||||
#define mov_rsi(x) \
|
||||
0x48, 0xbe, \
|
||||
(x)&0xff, ((x)>>8)&0xff, ((x)>>16)&0xff, ((x)>>24)&0xff, \
|
||||
((x)>>32)&0xff, ((x)>>40)&0xff, ((x)>>48)&0xff, ((x)>>56)&0xff
|
||||
|
||||
#define mov_eax(x) \
|
||||
0xb8, (x)&0xff, ((x)>>8)&0xff, ((x)>>16)&0xff, ((x)>>24)&0xff
|
||||
|
||||
static const uint8_t payload[] = {
|
||||
/* Casually unmap stack, vDSO and everything else. */
|
||||
/* munmap */
|
||||
mov_rdi(VADDR + 4096),
|
||||
mov_rsi((1ULL << 47) - 4096 - VADDR - 4096),
|
||||
mov_eax(11),
|
||||
syscall,
|
||||
|
||||
/* Ping parent. */
|
||||
/* write(0, &c, 1); */
|
||||
0x31, 0xff, /* xor edi, edi */
|
||||
0x48, 0x8d, 0x35, 0x00, 0x00, 0x00, 0x00, /* lea rsi, [rip] */
|
||||
0xba, 0x01, 0x00, 0x00, 0x00, /* mov edx, 1 */
|
||||
mov_eax(1),
|
||||
syscall,
|
||||
|
||||
/* 1: pause(); */
|
||||
mov_eax(34),
|
||||
syscall,
|
||||
|
||||
0xeb, 0xf7, /* jmp 1b */
|
||||
};
|
||||
|
||||
static int make_exe(const uint8_t *payload, size_t len)
|
||||
{
|
||||
struct elf64_hdr h;
|
||||
struct elf64_phdr ph;
|
||||
|
||||
struct iovec iov[3] = {
|
||||
{&h, sizeof(struct elf64_hdr)},
|
||||
{&ph, sizeof(struct elf64_phdr)},
|
||||
{(void *)payload, len},
|
||||
};
|
||||
int fd, fd1;
|
||||
char buf[64];
|
||||
|
||||
memset(&h, 0, sizeof(h));
|
||||
h.e_ident[0] = 0x7f;
|
||||
h.e_ident[1] = 'E';
|
||||
h.e_ident[2] = 'L';
|
||||
h.e_ident[3] = 'F';
|
||||
h.e_ident[4] = 2;
|
||||
h.e_ident[5] = 1;
|
||||
h.e_ident[6] = 1;
|
||||
h.e_ident[7] = 0;
|
||||
h.e_type = 2;
|
||||
h.e_machine = 0x3e;
|
||||
h.e_version = 1;
|
||||
h.e_entry = VADDR + sizeof(struct elf64_hdr) + sizeof(struct elf64_phdr);
|
||||
h.e_phoff = sizeof(struct elf64_hdr);
|
||||
h.e_shoff = 0;
|
||||
h.e_flags = 0;
|
||||
h.e_ehsize = sizeof(struct elf64_hdr);
|
||||
h.e_phentsize = sizeof(struct elf64_phdr);
|
||||
h.e_phnum = 1;
|
||||
h.e_shentsize = 0;
|
||||
h.e_shnum = 0;
|
||||
h.e_shstrndx = 0;
|
||||
|
||||
memset(&ph, 0, sizeof(ph));
|
||||
ph.p_type = 1;
|
||||
ph.p_flags = (1<<2)|1;
|
||||
ph.p_offset = 0;
|
||||
ph.p_vaddr = VADDR;
|
||||
ph.p_paddr = 0;
|
||||
ph.p_filesz = sizeof(struct elf64_hdr) + sizeof(struct elf64_phdr) + sizeof(payload);
|
||||
ph.p_memsz = sizeof(struct elf64_hdr) + sizeof(struct elf64_phdr) + sizeof(payload);
|
||||
ph.p_align = 4096;
|
||||
|
||||
fd = openat(AT_FDCWD, "/tmp", O_WRONLY|O_EXCL|O_TMPFILE, 0700);
|
||||
if (fd == -1) {
|
||||
exit(1);
|
||||
}
|
||||
|
||||
if (writev(fd, iov, 3) != sizeof(struct elf64_hdr) + sizeof(struct elf64_phdr) + len) {
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/* Avoid ETXTBSY on exec. */
|
||||
snprintf(buf, sizeof(buf), "/proc/self/fd/%u", fd);
|
||||
fd1 = open(buf, O_RDONLY|O_CLOEXEC);
|
||||
close(fd);
|
||||
|
||||
return fd1;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef __x86_64__
|
||||
int main(void)
|
||||
{
|
||||
int pipefd[2];
|
||||
int exec_fd;
|
||||
|
||||
atexit(ate);
|
||||
|
||||
make_private_tmp();
|
||||
|
||||
/* Reserve fd 0 for 1-byte pipe ping from child. */
|
||||
close(0);
|
||||
if (open("/", O_RDONLY|O_DIRECTORY|O_PATH) != 0) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
exec_fd = make_exe(payload, sizeof(payload));
|
||||
|
||||
if (pipe(pipefd) == -1) {
|
||||
return 1;
|
||||
}
|
||||
if (dup2(pipefd[1], 0) != 0) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
pid = fork();
|
||||
if (pid == -1) {
|
||||
return 1;
|
||||
}
|
||||
if (pid == 0) {
|
||||
sys_execveat(exec_fd, "", NULL, NULL, AT_EMPTY_PATH);
|
||||
return 1;
|
||||
}
|
||||
|
||||
char _;
|
||||
if (read(pipefd[0], &_, 1) != 1) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
struct stat st;
|
||||
if (fstat(exec_fd, &st) == -1) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Generate "head -n1 /proc/$PID/maps" */
|
||||
char buf0[256];
|
||||
memset(buf0, ' ', sizeof(buf0));
|
||||
int len = snprintf(buf0, sizeof(buf0),
|
||||
"%08lx-%08lx r-xp 00000000 %02lx:%02lx %llu",
|
||||
VADDR, VADDR + PAGE_SIZE,
|
||||
MAJOR(st.st_dev), MINOR(st.st_dev),
|
||||
(unsigned long long)st.st_ino);
|
||||
buf0[len] = ' ';
|
||||
snprintf(buf0 + MAPS_OFFSET, sizeof(buf0) - MAPS_OFFSET,
|
||||
"/tmp/#%llu (deleted)\n", (unsigned long long)st.st_ino);
|
||||
|
||||
|
||||
/* Test /proc/$PID/maps */
|
||||
{
|
||||
char buf[256];
|
||||
ssize_t rv;
|
||||
int fd;
|
||||
|
||||
snprintf(buf, sizeof(buf), "/proc/%u/maps", pid);
|
||||
fd = open(buf, O_RDONLY);
|
||||
if (fd == -1) {
|
||||
return 1;
|
||||
}
|
||||
rv = read(fd, buf, sizeof(buf));
|
||||
assert(rv == strlen(buf0));
|
||||
assert(memcmp(buf, buf0, strlen(buf0)) == 0);
|
||||
}
|
||||
|
||||
/* Test /proc/$PID/smaps */
|
||||
{
|
||||
char buf[1024];
|
||||
ssize_t rv;
|
||||
int fd;
|
||||
|
||||
snprintf(buf, sizeof(buf), "/proc/%u/smaps", pid);
|
||||
fd = open(buf, O_RDONLY);
|
||||
if (fd == -1) {
|
||||
return 1;
|
||||
}
|
||||
rv = read(fd, buf, sizeof(buf));
|
||||
assert(0 <= rv && rv <= sizeof(buf));
|
||||
|
||||
assert(rv >= strlen(buf0));
|
||||
assert(memcmp(buf, buf0, strlen(buf0)) == 0);
|
||||
|
||||
#define RSS1 "Rss: 4 kB\n"
|
||||
#define RSS2 "Rss: 0 kB\n"
|
||||
#define PSS1 "Pss: 4 kB\n"
|
||||
#define PSS2 "Pss: 0 kB\n"
|
||||
assert(memmem(buf, rv, RSS1, strlen(RSS1)) ||
|
||||
memmem(buf, rv, RSS2, strlen(RSS2)));
|
||||
assert(memmem(buf, rv, PSS1, strlen(PSS1)) ||
|
||||
memmem(buf, rv, PSS2, strlen(PSS2)));
|
||||
|
||||
static const char *S[] = {
|
||||
"Size: 4 kB\n",
|
||||
"KernelPageSize: 4 kB\n",
|
||||
"MMUPageSize: 4 kB\n",
|
||||
"Anonymous: 0 kB\n",
|
||||
"AnonHugePages: 0 kB\n",
|
||||
"Shared_Hugetlb: 0 kB\n",
|
||||
"Private_Hugetlb: 0 kB\n",
|
||||
"Locked: 0 kB\n",
|
||||
};
|
||||
int i;
|
||||
|
||||
for (i = 0; i < sizeof(S)/sizeof(S[0]); i++) {
|
||||
assert(memmem(buf, rv, S[i], strlen(S[i])));
|
||||
}
|
||||
}
|
||||
|
||||
/* Test /proc/$PID/smaps_rollup */
|
||||
{
|
||||
char bufr[256];
|
||||
memset(bufr, ' ', sizeof(bufr));
|
||||
len = snprintf(bufr, sizeof(bufr),
|
||||
"%08lx-%08lx ---p 00000000 00:00 0",
|
||||
VADDR, VADDR + PAGE_SIZE);
|
||||
bufr[len] = ' ';
|
||||
snprintf(bufr + MAPS_OFFSET, sizeof(bufr) - MAPS_OFFSET,
|
||||
"[rollup]\n");
|
||||
|
||||
char buf[1024];
|
||||
ssize_t rv;
|
||||
int fd;
|
||||
|
||||
snprintf(buf, sizeof(buf), "/proc/%u/smaps_rollup", pid);
|
||||
fd = open(buf, O_RDONLY);
|
||||
if (fd == -1) {
|
||||
return 1;
|
||||
}
|
||||
rv = read(fd, buf, sizeof(buf));
|
||||
assert(0 <= rv && rv <= sizeof(buf));
|
||||
|
||||
assert(rv >= strlen(bufr));
|
||||
assert(memcmp(buf, bufr, strlen(bufr)) == 0);
|
||||
|
||||
assert(memmem(buf, rv, RSS1, strlen(RSS1)) ||
|
||||
memmem(buf, rv, RSS2, strlen(RSS2)));
|
||||
assert(memmem(buf, rv, PSS1, strlen(PSS1)) ||
|
||||
memmem(buf, rv, PSS2, strlen(PSS2)));
|
||||
|
||||
static const char *S[] = {
|
||||
"Anonymous: 0 kB\n",
|
||||
"AnonHugePages: 0 kB\n",
|
||||
"Shared_Hugetlb: 0 kB\n",
|
||||
"Private_Hugetlb: 0 kB\n",
|
||||
"Locked: 0 kB\n",
|
||||
};
|
||||
int i;
|
||||
|
||||
for (i = 0; i < sizeof(S)/sizeof(S[0]); i++) {
|
||||
assert(memmem(buf, rv, S[i], strlen(S[i])));
|
||||
}
|
||||
}
|
||||
|
||||
/* Test /proc/$PID/statm */
|
||||
{
|
||||
char buf[64];
|
||||
ssize_t rv;
|
||||
int fd;
|
||||
|
||||
snprintf(buf, sizeof(buf), "/proc/%u/statm", pid);
|
||||
fd = open(buf, O_RDONLY);
|
||||
if (fd == -1) {
|
||||
return 1;
|
||||
}
|
||||
rv = read(fd, buf, sizeof(buf));
|
||||
assert(rv == 7 * 2);
|
||||
|
||||
assert(buf[0] == '1'); /* ->total_vm */
|
||||
assert(buf[1] == ' ');
|
||||
assert(buf[2] == '0' || buf[2] == '1'); /* rss */
|
||||
assert(buf[3] == ' ');
|
||||
assert(buf[4] == '0' || buf[2] == '1'); /* file rss */
|
||||
assert(buf[5] == ' ');
|
||||
assert(buf[6] == '1'); /* ELF executable segments */
|
||||
assert(buf[7] == ' ');
|
||||
assert(buf[8] == '0');
|
||||
assert(buf[9] == ' ');
|
||||
assert(buf[10] == '0'); /* ->data_vm + ->stack_vm */
|
||||
assert(buf[11] == ' ');
|
||||
assert(buf[12] == '0');
|
||||
assert(buf[13] == '\n');
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
int main(void)
|
||||
{
|
||||
return 4;
|
||||
}
|
||||
#endif
|
||||
Loading…
Reference in New Issue