make realpath use O_PATH when opening the file

this avoids failure if the file is not readable and avoids odd
behavior for device nodes, etc. on old kernels that lack O_PATH, the
old behavior (O_RDONLY) will naturally happen as the fallback.

diff --git a/src/misc/realpath.c b/src/misc/realpath.c
index d238ed014db44f70536079df3b3bc9f9262c99ce..2b84649716b4bc08f004b0707f6ed44f20c3aa5f 100644 (file)
--- a/src/misc/realpath.c
+++ b/src/misc/realpath.c
@@ -21,7 +21,7 @@ char *realpath(const char *restrict filename, char *restrict resolved)
                return 0;
        }
 
-       fd = open(filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC);
+       fd = open(filename, O_PATH|O_NONBLOCK|O_CLOEXEC);
        if (fd < 0) return 0;
        __procfdname(buf, fd);