diff options
| -rw-r--r-- | libsandbox/wrapper-funcs/__pre_at_check.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/libsandbox/wrapper-funcs/__pre_at_check.c b/libsandbox/wrapper-funcs/__pre_at_check.c new file mode 100644 index 0000000..f72c40c --- /dev/null +++ b/libsandbox/wrapper-funcs/__pre_at_check.c @@ -0,0 +1,34 @@ +/* + * common *at() pre-checks. + * + * Copyright 1999-2012 Gentoo Foundation + * Licensed under the GPL-2 + */ + +/* We assume the parent has nested use with save/restore errno */ +bool sb_common_at_pre_check(const char *func, const char **pathname, int dirfd, + char *dirfd_path, size_t dirfd_path_len) +{ + /* the empty path name should fail with ENOENT before any dirfd + * checks get a chance to run #346929 + */ + if (*pathname && *pathname[0] == '\0') { + errno = ENOENT; + sb_debug_dyn("EARLY FAIL: %s(%s): %s\n", + func, *pathname, strerror(errno)); + return false; + } + + /* Expand the dirfd path first */ + switch (resolve_dirfd_path(dirfd, *pathname, dirfd_path, dirfd_path_len)) { + case -1: + sb_debug_dyn("EARLY FAIL: %s(%s) @ resolve_dirfd_path: %s\n", + func, *pathname, strerror(errno)); + return false; + case 0: + *pathname = dirfd_path; + break; + } + + return true; +} |