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uid-range: add new uid_range_load_userns() for loading /proc/self/uid_map

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This commit is contained in:
Lennart Poettering
2022-04-01 11:20:12 +02:00
parent 2e37ebdae9
commit 5674aa7a2c
3 changed files with 98 additions and 0 deletions
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src/test/test-uid-range.c
+47
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@@ -3,10 +3,16 @@
#include <stddef.h>
#include "alloc-util.h"
#include "errno-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "fs-util.h"
#include "tests.h"
#include "tmpfile-util.h"
#include "uid-range.h"
#include "user-util.h"
#include "util.h"
#include "virt.h"
TEST(uid_range) {
_cleanup_free_ UidRange *p = NULL;
@@ -72,4 +78,45 @@ TEST(uid_range) {
assert_se(p[0].nr == 1983);
}
TEST(load_userns) {
_cleanup_(unlink_and_freep) char *fn = NULL;
_cleanup_free_ UidRange *p = NULL;
_cleanup_fclose_ FILE *f = NULL;
size_t n = 0;
int r;
r = uid_range_load_userns(&p, &n, NULL);
if (ERRNO_IS_NOT_SUPPORTED(r))
return;
assert_se(r >= 0);
assert_se(uid_range_contains(p, n, getuid()));
r = running_in_userns();
if (r == 0) {
assert_se(n == 1);
assert_se(p[0].start == 0);
assert_se(p[0].nr == UINT32_MAX);
}
assert_se(fopen_temporary(NULL, &f, &fn) >= 0);
fputs("0 0 20\n"
"100 0 20\n", f);
assert_se(fflush_and_check(f) >= 0);
p = mfree(p);
n = 0;
assert_se(uid_range_load_userns(&p, &n, fn) >= 0);
assert_se(uid_range_contains(p, n, 0));
assert_se(uid_range_contains(p, n, 19));
assert_se(!uid_range_contains(p, n, 20));
assert_se(!uid_range_contains(p, n, 99));
assert_se(uid_range_contains(p, n, 100));
assert_se(uid_range_contains(p, n, 119));
assert_se(!uid_range_contains(p, n, 120));
}
DEFINE_TEST_MAIN(LOG_DEBUG);