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146 lines
4.3 KiB
146 lines
4.3 KiB
// RUN: %clangxx_msan -O0 %s -o %t && %run %t %p 2>&1
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// RUN: %clangxx_msan -O0 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t %p 2>&1
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// RUN: %clangxx_msan -O3 %s -o %t && %run %t %p 2>&1
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#include <argz.h>
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#include <assert.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sanitizer/msan_interface.h>
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// Do not depend on libattr headers.
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#ifndef ENOATTR
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#define ENOATTR ENODATA
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#endif
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extern "C" {
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ssize_t listxattr(const char *path, char *list, size_t size);
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ssize_t llistxattr(const char *path, char *list, size_t size);
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ssize_t flistxattr(int fd, char *list, size_t size);
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ssize_t getxattr(const char *path, const char *name, void *value, size_t size);
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ssize_t lgetxattr(const char *path, const char *name, void *value, size_t size);
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ssize_t fgetxattr(int fd, const char *name, void *value, size_t size);
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}
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char g_path[1024];
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int g_fd;
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// Life before closures...
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ssize_t listxattr_wrapper(char *buf, size_t size) {
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return listxattr(g_path, buf, size);
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}
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ssize_t llistxattr_wrapper(char *buf, size_t size) {
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return llistxattr(g_path, buf, size);
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}
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ssize_t flistxattr_wrapper(char *buf, size_t size) {
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return flistxattr(g_fd, buf, size);
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}
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ssize_t getxattr_wrapper(const char *name, char *buf, size_t size) {
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return getxattr(g_path, name, buf, size);
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}
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ssize_t lgetxattr_wrapper(const char *name, char *buf, size_t size) {
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return lgetxattr(g_path, name, buf, size);
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}
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ssize_t fgetxattr_wrapper(const char *name, char *buf, size_t size) {
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return fgetxattr(g_fd, name, buf, size);
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}
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size_t test_list(ssize_t fun(char*, size_t), char **buf) {
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int buf_size = 1024;
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while (true) {
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*buf = (char *)malloc(buf_size);
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assert(__msan_test_shadow(*buf, buf_size) != -1);
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ssize_t res = fun(*buf, buf_size);
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if (res >= 0) {
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assert(__msan_test_shadow(*buf, buf_size) == res);
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return res;
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}
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if (errno == ENOTSUP) {
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printf("Extended attributes are disabled. *xattr test is a no-op.\n");
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exit(0);
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}
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assert(errno == ERANGE);
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free(*buf);
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buf_size *= 2;
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}
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}
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// True means success. False means result inconclusive because we don't have
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// access to this attribute.
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bool test_get_single_attr(ssize_t fun(const char *, char *, size_t),
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const char *attr_name) {
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char *buf;
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int buf_size = 1024;
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while (true) {
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buf = (char *)malloc(buf_size);
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assert(__msan_test_shadow(buf, buf_size) != -1);
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ssize_t res = fun(attr_name, buf, buf_size);
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if (res >= 0) {
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assert(__msan_test_shadow(buf, buf_size) == res);
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free(buf);
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return true;
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}
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if (errno == ENOTSUP) {
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printf("Extended attributes are disabled. *xattr test is a no-op.\n");
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exit(0);
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}
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if (errno == ENOATTR)
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return false;
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assert(errno == ERANGE);
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free(buf);
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buf_size *= 2;
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}
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}
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void test_get(ssize_t fun(const char *, char *, size_t), const char *attr_list,
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size_t attr_list_size) {
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// Try every attribute, until we see one we can access. Attribute names are
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// null-separated strings in attr_list.
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size_t attr_list_len = argz_count(attr_list, attr_list_size);
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size_t argv_size = (attr_list_len + 1) * sizeof(char *);
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char **attrs = (char **)malloc(argv_size);
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argz_extract(attr_list, attr_list_size, attrs);
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// TODO(smatveev): we need proper argz_* interceptors
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__msan_unpoison(attrs, argv_size);
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for (size_t i = 0; (i < attr_list_len) && attrs[i]; i++) {
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if (test_get_single_attr(fun, attrs[i]))
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return;
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}
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printf("*xattr test could not access any attributes.\n");
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}
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// TODO: set some attributes before trying to retrieve them with *getxattr.
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// Currently the list is empty, so *getxattr is not tested.
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int main(int argc, char *argv[]) {
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assert(argc == 2);
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snprintf(g_path, sizeof(g_path), "%s/%s", argv[1], "xattr_test_root/a");
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g_fd = open(g_path, O_RDONLY);
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assert(g_fd);
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char *attr_list;
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size_t attr_list_size;
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attr_list_size = test_list(listxattr_wrapper, &attr_list);
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free(attr_list);
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attr_list_size = test_list(llistxattr_wrapper, &attr_list);
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free(attr_list);
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attr_list_size = test_list(flistxattr_wrapper, &attr_list);
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test_get(getxattr_wrapper, attr_list, attr_list_size);
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test_get(lgetxattr_wrapper, attr_list, attr_list_size);
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test_get(fgetxattr_wrapper, attr_list, attr_list_size);
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free(attr_list);
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return 0;
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}
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