* [PATCH] LSM: add missing hook to do_compat_readv_writev()
@ 2006-04-26 6:45 James Morris
2006-04-26 18:04 ` Chris Wright
0 siblings, 1 reply; 2+ messages in thread
From: James Morris @ 2006-04-26 6:45 UTC (permalink / raw)
To: Linus Torvalds; +Cc: Al Viro, Chris Wright, Stephen Smalley, linux-kernel
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 <jmorris@namei.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[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;
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] LSM: add missing hook to do_compat_readv_writev()
2006-04-26 6:45 [PATCH] LSM: add missing hook to do_compat_readv_writev() James Morris
@ 2006-04-26 18:04 ` Chris Wright
0 siblings, 0 replies; 2+ messages in thread
From: Chris Wright @ 2006-04-26 18:04 UTC (permalink / raw)
To: James Morris
Cc: Linus Torvalds, Al Viro, Chris Wright, Stephen Smalley, linux-kernel
* James Morris (jmorris@namei.org) wrote:
> 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 <jmorris@namei.org>
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Chris Wright <chrisw@sous-sol.org>
thanks,
-chris
^ permalink raw reply [flat|nested] 2+ messages in thread
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2006-04-26 6:45 [PATCH] LSM: add missing hook to do_compat_readv_writev() James Morris
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