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.
Please apply.
Signed-off-by: James Morris <[email protected]>
Signed-off-by: Al Viro <[email protected]>
[1] http://lwn.net/Articles/154282/
---
diff -purN -X dontdiff linux-2.6.17-rc2.o/fs/compat.c linux-2.6.17-rc2.fix/fs/compat.c
--- linux-2.6.17-rc2.o/fs/compat.c 2006-04-19 23:31:24.000000000 -0400
+++ linux-2.6.17-rc2.fix/fs/compat.c 2006-04-25 20:41:39.000000000 -0400
@@ -1217,6 +1217,10 @@ static ssize_t compat_do_readv_writev(in
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;
-
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