[33/81] 9pfs: fix O_PATH build break with older glibc versions

Submitted by Michael Roth on March 20, 2017, 11:07 p.m.

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Message ID 1490051325-3770-34-git-send-email-mdroth@linux.vnet.ibm.com
State New
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Michael Roth March 20, 2017, 11:07 p.m.
From: Greg Kurz <groug@kaod.org>

When O_PATH is used with O_DIRECTORY, it only acts as an optimization: the
openat() syscall simply finds the name in the VFS, and doesn't trigger the
underlying filesystem.

On systems that don't define O_PATH, because they have glibc version 2.13
or older for example, we can safely omit it. We don't want to deactivate
O_PATH globally though, in case it is used without O_DIRECTORY. The is done
with a dedicated macro.

Systems without O_PATH may thus fail to resolve names that involve
unreadable directories, compared to newer systems succeeding, but such
corner case failure is our only option on those older systems to avoid
the security hole of chasing symlinks inappropriately.

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
(added last paragraph to changelog as suggested by Eric Blake)
Signed-off-by: Greg Kurz <groug@kaod.org>

(cherry picked from commit 918112c02aff2bac4cb72dc2feba0cb05305813e)
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/9pfs/9p-util.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Patch hide | download patch | download mbox

diff --git a/hw/9pfs/9p-util.h b/hw/9pfs/9p-util.h
index 091f3ce..cb7b207 100644
--- a/hw/9pfs/9p-util.h
+++ b/hw/9pfs/9p-util.h
@@ -22,7 +22,12 @@  static inline void close_preserve_errno(int fd)
 
 static inline int openat_dir(int dirfd, const char *name)
 {
-    return openat(dirfd, name, O_DIRECTORY | O_RDONLY | O_PATH);
+#ifdef O_PATH
+#define OPENAT_DIR_O_PATH O_PATH
+#else
+#define OPENAT_DIR_O_PATH 0
+#endif
+    return openat(dirfd, name, O_DIRECTORY | O_RDONLY | OPENAT_DIR_O_PATH);
 }
 
 static inline int openat_file(int dirfd, const char *name, int flags,