61 lines
2.0 KiB
Diff
61 lines
2.0 KiB
Diff
From 7df60e06e6a176e2ee177df015d5e7ecc80ed229 Mon Sep 17 00:00:00 2001
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From: Jonathan Nieder <jrnieder@gmail.com>
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Date: Mon, 26 Sep 2011 16:16:37 -0500
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Subject: [BUILTIN] Fix "test -x" as root on platforms with old-fashioned
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faccessat()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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When dash switched from its own emulation to the true faccessat in
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v0.5.7~54 (2010-04-02), on some platforms (e.g., old versions of
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glibc-bsd), "test -x <path>" started returning true on all files when
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run as root. This violates POSIX.1-2008 §4.4 "File Access
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Permission", which says:
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If execute permission is requested, access shall be granted
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if execute permission is granted to at least one user by the
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file permission bits or by an alternate access control
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mechanism; otherwise, access shall be denied.
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Unfortunately, for historical reasons, access() and faccessat() are
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allowed by POSIX to return success for X_OK when the current process
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is privileged even when the above condition is not fulfilled and
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actual execution would fail. Work around this by checking the
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permissions bits when mode == X_OK and geteuid() == 0.
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Reported-by: Christoph Egger <christoph@debian.org>
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Analysis-by: Petr Salinger <Petr.Salinger@seznam.cz>
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Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
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---
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src/bltin/test.c | 11 +++++++++++
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1 files changed, 11 insertions(+), 0 deletions(-)
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diff --git a/src/bltin/test.c b/src/bltin/test.c
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index 90135e14..1093b59f 100644
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--- src/bltin/test.c
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+++ src/bltin/test.c
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@@ -485,8 +485,19 @@ equalf (const char *f1, const char *f2)
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}
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#ifdef HAVE_FACCESSAT
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+static int has_exec_bit_set(const char *path)
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+{
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+ struct stat64 st;
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+
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+ if (stat64(path, &st))
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+ return 0;
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+ return st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH);
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+}
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+
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static int test_file_access(const char *path, int mode)
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{
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+ if (mode == X_OK && geteuid() == 0 && !has_exec_bit_set(path))
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+ return 0;
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return !faccessat(AT_FDCWD, path, mode, AT_EACCESS);
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}
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#else /* HAVE_FACCESSAT */
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--
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1.7.7.rc1
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