From e7edf9cdeddc0cff125e8e658216efb2ff2b2219 Mon Sep 17 00:00:00 2001 From: James Morris Date: Wed, 26 Apr 2006 02:45:03 -0400 Subject: [PATCH] [PATCH] LSM: add missing hook to do_compat_readv_writev() This patch addresses a flaw in LSM, where there is no mediation of readv() and writev() in for 32-bit compatible apps using a 64-bit kernel. This bug was discovered and fixed initially in the native readv/writev code [1], but was not fixed in the compat code. Thanks to Al for spotting this one. [1] http://lwn.net/Articles/154282/ Signed-off-by: James Morris Signed-off-by: Al Viro Signed-off-by: Linus Torvalds --- fs/compat.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/compat.c b/fs/compat.c index 7f8e26ea427c..2e32bd340474 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -1217,6 +1217,10 @@ static ssize_t compat_do_readv_writev(int type, struct file *file, if (ret < 0) goto out; + ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE); + if (ret) + goto out; + fnv = NULL; if (type == READ) { fn = file->f_op->read; -- 2.20.1