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Diffstat (limited to 'libsandbox')
-rw-r--r--libsandbox/wrapper-funcs/__pre_at_check.c34
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;
+}