linux-kernel - [PATCH 3.2 051/152] x86/syscalls/64: Add compat_sys

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Date:   Mon, 14 Nov 2016 00:14:07 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Peter Zijlstra" <peterz@...radead.org>,
        "David Howells" <dhowells@...hat.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Stephan Mueller" <smueller@...onox.de>,
        "Andy Lutomirski" <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Denys Vlasenko" <dvlasenk@...hat.com>,
        "Ingo Molnar" <mingo@...nel.org>,
        linux-security-module@...r.kernel.org,
        "Josh Poimboeuf" <jpoimboe@...hat.com>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        keyrings@...r.kernel.org, "Borislav Petkov" <bp@...en8.de>,
        "Brian Gerst" <brgerst@...il.com>
Subject: [PATCH 3.2 051/152] x86/syscalls/64: Add compat_sys_keyctl for
 32-bit userspace

3.2.84-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: David Howells <dhowells@...hat.com>

commit f7d665627e103e82d34306c7d3f6f46f387c0d8b upstream.

x86_64 needs to use compat_sys_keyctl for 32-bit userspace rather than
calling sys_keyctl(). The latter will work in a lot of cases, thereby
hiding the issue.

Reported-by: Stephan Mueller <smueller@...onox.de>
Tested-by: Stephan Mueller <smueller@...onox.de>
Signed-off-by: David Howells <dhowells@...hat.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: keyrings@...r.kernel.org
Cc: linux-security-module@...r.kernel.org
Link: http://lkml.kernel.org/r/146961615805.14395.5581949237156769439.stgit@warthog.procyon.org.uk
Signed-off-by: Ingo Molnar <mingo@...nel.org>
[bwh: Backported to 3.2: compat system call table is in ia32entry.S]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -791,7 +791,7 @@ ia32_sys_call_table:
 	.quad quiet_ni_syscall		/* 285: sys_altroot */
 	.quad sys_add_key
 	.quad sys_request_key
-	.quad sys_keyctl
+	.quad compat_sys_keyctl
 	.quad sys_ioprio_set
 	.quad sys_ioprio_get		/* 290 */
 	.quad sys_inotify_init