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tools/testing/selftests/proc/proc-pid-vm.c: test with vsyscall in mind 

: selftests: proc: proc-pid-vm
: ========================================
: proc-pid-vm: proc-pid-vm.c:277: main: Assertion `rv == strlen(buf0)' failed.
: Aborted

Because the vsyscall mapping is enabled.  Read from vsyscall page to tell
if vsyscall is being used.

Link: http://lkml.kernel.org/r/20190307183204.GA11405@avx2
Link: http://lkml.kernel.org/r/20190219094722.GB28258@shao2-debian
Fixes: 34aab6bec23e7e9 ("proc: test /proc/*/maps, smaps, smaps_rollup, statm")
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reported-by: kernel test robot <rong.a.chen@intel.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 2019-03-13 11:44:29 -07:00 committed by Linus Torvalds
parent ce82f19fd5
commit 17415606f9
1 changed files with 46 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
tools/testing/selftests/proc/proc-pid-vm.c
View File

@ -29,6 +29,7 @@
#include <errno.h>
#include <sched.h>
#include <signal.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
@ -36,11 +37,14 @@
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/uio.h>
#include <linux/kdev_t.h>
#include <sys/time.h>
#include <sys/resource.h>
static inline long sys_execveat(int dirfd, const char *pathname, char **argv, char **envp, int flags)
{
@ -205,12 +209,44 @@ static int make_exe(const uint8_t *payload, size_t len)
}
#endif
static bool g_vsyscall = false;
static const char str_vsyscall[] =
"ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]\n";
#ifdef __x86_64__
/*
* vsyscall page can't be unmapped, probe it with memory load.
*/
static void vsyscall(void)
{
pid_t pid;
int wstatus;
pid = fork();
if (pid < 0) {
fprintf(stderr, "fork, errno %d\n", errno);
exit(1);
}
if (pid == 0) {
struct rlimit rlim = {0, 0};
(void)setrlimit(RLIMIT_CORE, &rlim);
*(volatile int *)0xffffffffff600000UL;
exit(0);
}
wait(&wstatus);
if (WIFEXITED(wstatus)) {
g_vsyscall = true;
}
}
int main(void)
{
int pipefd[2];
int exec_fd;
vsyscall();
atexit(ate);
make_private_tmp();
@ -261,9 +297,9 @@ int main(void)
snprintf(buf0 + MAPS_OFFSET, sizeof(buf0) - MAPS_OFFSET,
"/tmp/#%llu (deleted)\n", (unsigned long long)st.st_ino);
/* Test /proc/$PID/maps */
{
const size_t len = strlen(buf0) + (g_vsyscall ? strlen(str_vsyscall) : 0);
char buf[256];
ssize_t rv;
int fd;
@ -274,13 +310,16 @@ int main(void)
return 1;
}
rv = read(fd, buf, sizeof(buf));
assert(rv == strlen(buf0));
assert(rv == len);
assert(memcmp(buf, buf0, strlen(buf0)) == 0);
if (g_vsyscall) {
assert(memcmp(buf + strlen(buf0), str_vsyscall, strlen(str_vsyscall)) == 0);
}
}
/* Test /proc/$PID/smaps */
{
char buf[1024];
char buf[4096];
ssize_t rv;
int fd;
@ -319,6 +358,10 @@ int main(void)
for (i = 0; i < sizeof(S)/sizeof(S[0]); i++) {
assert(memmem(buf, rv, S[i], strlen(S[i])));
}
if (g_vsyscall) {
assert(memmem(buf, rv, str_vsyscall, strlen(str_vsyscall)));
}
}
/* Test /proc/$PID/smaps_rollup */