diff --git a/test/zdtm/lib/fs.c b/test/zdtm/lib/fs.c index 0decfc37b..e82011ec8 100644 --- a/test/zdtm/lib/fs.c +++ b/test/zdtm/lib/fs.c @@ -94,3 +94,27 @@ err: mnt_info_free(&m); goto out; } + +int get_cwd_check_perm(char **result) +{ + char *cwd; + *result = 0; + cwd = get_current_dir_name(); + if (!cwd) { + pr_perror("failed to get current directory"); + return -1; + } + + if (access(cwd, X_OK)) { + pr_err("access check for bit X for current dir path '%s' " + "failed for uid:%d,gid:%d, error: %d(%s). " + "Bit 'x' should be set in all path components of " + "this directory\n", + cwd, getuid(), getgid(), errno, strerror(errno) + ); + return -1; + } + + *result = cwd; + return 0; +} diff --git a/test/zdtm/lib/fs.h b/test/zdtm/lib/fs.h index 972b15aba..af7a665fb 100644 --- a/test/zdtm/lib/fs.h +++ b/test/zdtm/lib/fs.h @@ -50,4 +50,28 @@ extern mnt_info_t *mnt_info_alloc(void); extern void mnt_info_free(mnt_info_t **m); extern mnt_info_t *get_cwd_mnt_info(void); +/* + * get_cwd_check_perm is called to check that cwd is actually usable for a calling + * process. + * + * Example output of a stat command on a '/root' path shows file access bits: + * > stat /root + * File: ‘/root’ + * ... + * Access: (0550/dr-xr-x---) Uid: ( 0/root) Gid: ( 0/root) + * ^- no 'x' bit for other + * + * Here we can see that '/root' dir (that often can be part of cwd path) does not + * allow non-root user and non-root group to list contents of this directory. + * Calling process matching 'other' access category may succeed getting cwd path, but will + * fail performing further filesystem operations based on this path with confusing errors. + * + * This function calls get_current_dir_name and explicitly checks that bit 'x' is enabled for + * a calling process and logs the error. + * + * If check passes, stores get_current_dir's result in *result and returns 0 + * If check fails, stores 0 in *result and returns -1 + */ +extern int get_cwd_check_perm(char **result); + #endif /* ZDTM_FS_H_ */