linux-kernel - [PATCH] prctl: fix validation of an address

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1356778810-20879-1-git-send-email-avagin@openvz.org>
Date:	Sat, 29 Dec 2012 15:00:10 +0400
From:	Andrey Vagin <avagin@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	Andrey Vagin <avagin@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Eric Paris <eparis@...hat.com>,
	James Morris <jmorris@...ei.org>
Subject: [PATCH] prctl: fix validation of an address

The address should be bigger than dac_mmap_min_addr, because
a process with CAP_RAWIO can map a vma bellow mmap_min_addr.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Serge Hallyn <serge.hallyn@...onical.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Eric Paris <eparis@...hat.com>
Cc: James Morris <jmorris@...ei.org>
Signed-off-by: Andrey Vagin <avagin@...nvz.org>
---
 kernel/sys.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index 265b376..e0e1bbd 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1868,7 +1868,7 @@ static int prctl_set_mm(int opt, unsigned long addr,
 	if (opt == PR_SET_MM_EXE_FILE)
 		return prctl_set_mm_exe_file(mm, (unsigned int)addr);
 
-	if (addr >= TASK_SIZE || addr < mmap_min_addr)
+	if (addr >= TASK_SIZE || addr < dac_mmap_min_addr)
 		return -EINVAL;
 
 	error = -EINVAL;
-- 
1.7.11.7

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/