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ROFL: Rolling on the floor looping

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Please tell me this was an easter egg :P

 #define go_banana() ({ goto nowhere; nowhere: 0-0; })

Closes: <https://github.com/shadow-maint/shadow/issues/736>
Easter-egg: 8492dee663 ("subids: support nsswitch")
Signed-off-by: Alejandro Colomar <alx@kernel.org>
This commit is contained in:
Alejandro Colomar
2023-05-31 09:29:49 -05:00
committed by Serge Hallyn
parent 8219fbd421
commit 2f9ca4b49d
1 changed files with 59 additions and 61 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/nss.c
+59 -61
View File
@@ -46,6 +46,8 @@ void nss_init(const char *nsswitch_path) {
char *line = NULL, *p, *token, *saveptr;
size_t len = 0;
FILE *shadow_logfd = log_get_logfd();
char libname[65];
void *h;
if (atomic_flag_test_and_set(&nss_init_started)) {
// Another thread has started nss_init, wait for it to complete
@@ -68,9 +70,6 @@ void nss_init(const char *nsswitch_path) {
return;
}
while ((getline(&line, &len, nssfp)) != -1) {
char libname[65];
void *h;
if (line[0] == '\0' || line[0] == '#')
continue;
if (strlen(line) < 8)
@@ -80,66 +79,65 @@ void nss_init(const char *nsswitch_path) {
p = &line[6];
while ((*p) && isspace(*p))
p++;
if (!*p)
continue;
token = strtok_r(p, " \n\t", &saveptr);
if (token == NULL) {
fprintf(shadow_logfd, "No usable subid NSS module found, using files\n");
// subid_nss has to be null here, but to ease reviews:
free(subid_nss);
subid_nss = NULL;
goto done;
}
if (strcmp(token, "files") == 0) {
subid_nss = NULL;
goto done;
}
if (strlen(token) > 50) {
fprintf(shadow_logfd, "Subid NSS module name too long (longer than 50 characters): %s\n", token);
fprintf(shadow_logfd, "Using files\n");
subid_nss = NULL;
goto done;
}
snprintf(libname, 64, "libsubid_%s.so", token);
h = dlopen(libname, RTLD_LAZY);
if (!h) {
fprintf(shadow_logfd, "Error opening %s: %s\n", libname, dlerror());
fprintf(shadow_logfd, "Using files\n");
subid_nss = NULL;
goto done;
}
subid_nss = MALLOC(struct subid_nss_ops);
if (!subid_nss) {
dlclose(h);
goto done;
}
subid_nss->has_range = dlsym(h, "shadow_subid_has_range");
if (!subid_nss->has_range) {
fprintf(shadow_logfd, "%s did not provide @has_range@\n", libname);
dlclose(h);
free(subid_nss);
subid_nss = NULL;
goto done;
}
subid_nss->list_owner_ranges = dlsym(h, "shadow_subid_list_owner_ranges");
if (!subid_nss->list_owner_ranges) {
fprintf(shadow_logfd, "%s did not provide @list_owner_ranges@\n", libname);
dlclose(h);
free(subid_nss);
subid_nss = NULL;
goto done;
}
subid_nss->find_subid_owners = dlsym(h, "shadow_subid_find_subid_owners");
if (!subid_nss->find_subid_owners) {
fprintf(shadow_logfd, "%s did not provide @find_subid_owners@\n", libname);
dlclose(h);
free(subid_nss);
subid_nss = NULL;
goto done;
}
subid_nss->handle = h;
if (*p != '\0')
break;
}
token = strtok_r(p, " \n\t", &saveptr);
if (token == NULL) {
fprintf(shadow_logfd, "No usable subid NSS module found, using files\n");
// subid_nss has to be null here, but to ease reviews:
free(subid_nss);
subid_nss = NULL;
goto done;
}
if (strcmp(token, "files") == 0) {
subid_nss = NULL;
goto done;
}
if (strlen(token) > 50) {
fprintf(shadow_logfd, "Subid NSS module name too long (longer than 50 characters): %s\n", token);
fprintf(shadow_logfd, "Using files\n");
subid_nss = NULL;
goto done;
}
snprintf(libname, 64, "libsubid_%s.so", token);
h = dlopen(libname, RTLD_LAZY);
if (!h) {
fprintf(shadow_logfd, "Error opening %s: %s\n", libname, dlerror());
fprintf(shadow_logfd, "Using files\n");
subid_nss = NULL;
goto done;
}
subid_nss = MALLOC(struct subid_nss_ops);
if (!subid_nss) {
dlclose(h);
goto done;
}
subid_nss->has_range = dlsym(h, "shadow_subid_has_range");
if (!subid_nss->has_range) {
fprintf(shadow_logfd, "%s did not provide @has_range@\n", libname);
dlclose(h);
free(subid_nss);
subid_nss = NULL;
goto done;
}
subid_nss->list_owner_ranges = dlsym(h, "shadow_subid_list_owner_ranges");
if (!subid_nss->list_owner_ranges) {
fprintf(shadow_logfd, "%s did not provide @list_owner_ranges@\n", libname);
dlclose(h);
free(subid_nss);
subid_nss = NULL;
goto done;
}
subid_nss->find_subid_owners = dlsym(h, "shadow_subid_find_subid_owners");
if (!subid_nss->find_subid_owners) {
fprintf(shadow_logfd, "%s did not provide @find_subid_owners@\n", libname);
dlclose(h);
free(subid_nss);
subid_nss = NULL;
goto done;
}
subid_nss->handle = h;
done:
atomic_store(&nss_init_completed, true);