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selftests/nolibc: add mmap_munmap_good test case 

mmap() a file with a good offset and then munmap() it. a non-zero offset
is passed to test the 6th argument of my_syscall6().

Note, it is not easy to find a unique file for mmap() in different
scenes, so, a file list is used to search the right one:

- /dev/zero: is commonly used to allocate anonymous memory and is likely
  present and readable

- /proc/1/exe: for 'run' and 'run-user' target, 'run-user' can not find
  '/proc/self/exe'

- /proc/self/exe: for 'libc-test' target, normal program 'libc-test' has
  no permission to access '/proc/1/exe'

- argv0: the path of the program itself, let it pass even with worst
  case scene: no procfs and no /dev/zero

Suggested-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/lkml/20230702193306.GK16233@1wt.eu/
Suggested-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/lkml/bff82ea6-610b-4471-a28b-6c76c28604a6@t-8ch.de/
Signed-off-by: Zhangjin Wu <falcon@tinylab.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Zhangjin Wu 2023-07-07 23:08:20 +08:00 committed by Willy Tarreau
parent ba3d0892be
commit fcdbf5dda4
1 changed files with 60 additions and 0 deletions
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60
tools/testing/selftests/nolibc/nolibc-test.c
View File

@ -595,6 +595,65 @@ static int test_stat_timestamps(void)
return 0;
}
int test_mmap_munmap(void)
{
int ret, fd, i;
void *mem;
size_t page_size, file_size, length;
off_t offset, pa_offset;
struct stat stat_buf;
const char * const files[] = {
"/dev/zero",
"/proc/1/exe", "/proc/self/exe",
argv0,
NULL
};
page_size = getpagesize();
if (page_size < 0)
return -1;
/* find a right file to mmap, existed and accessible */
for (i = 0; files[i] != NULL; i++) {
ret = fd = open(files[i], O_RDONLY);
if (ret == -1)
continue;
else
break;
}
if (ret == -1)
return ret;
ret = stat(files[i], &stat_buf);
if (ret == -1)
goto end;
/* file size of the special /dev/zero is 0, let's assign one manually */
if (i == 0)
file_size = 3*page_size;
else
file_size = stat_buf.st_size;
offset = file_size - 1;
if (offset < 0)
offset = 0;
length = file_size - offset;
pa_offset = offset & ~(page_size - 1);
mem = mmap(NULL, length + offset - pa_offset, PROT_READ, MAP_SHARED, fd, pa_offset);
if (mem == MAP_FAILED) {
ret = -1;
goto end;
}
ret = munmap(mem, length + offset - pa_offset);
end:
close(fd);
return ret;
}
/* Run syscall tests between IDs <min> and <max>.
* Return 0 on success, non-zero on failure.
*/
@ -671,6 +730,7 @@ int run_syscall(int min, int max)
CASE_TEST(mkdir_root); EXPECT_SYSER(1, mkdir("/", 0755), -1, EEXIST); break;
CASE_TEST(mmap_bad); EXPECT_PTRER(1, mmap(NULL, 0, PROT_READ, MAP_PRIVATE, 0, 0), MAP_FAILED, EINVAL); break;
CASE_TEST(munmap_bad); EXPECT_SYSER(1, munmap((void *)1, 0), -1, EINVAL); break;
CASE_TEST(mmap_munmap_good); EXPECT_SYSZR(1, test_mmap_munmap()); break;
CASE_TEST(open_tty); EXPECT_SYSNE(1, tmp = open("/dev/null", 0), -1); if (tmp != -1) close(tmp); break;
CASE_TEST(open_blah); EXPECT_SYSER(1, tmp = open("/proc/self/blah", 0), -1, ENOENT); if (tmp != -1) close(tmp); break;
CASE_TEST(poll_null); EXPECT_SYSZR(1, poll(NULL, 0, 0)); break;