linux-kernel - [PATCH 5.4 151/177] seccomp: avoid overflow in implicit constant conversion

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Message-Id: <20191216174847.985672730@linuxfoundation.org>
Date:   Mon, 16 Dec 2019 18:50:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>,
        Tyler Hicks <tyhicks@...onical.com>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>, Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Tycho Andersen <tycho@...ho.ws>,
        linux-kselftest@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: [PATCH 5.4 151/177] seccomp: avoid overflow in implicit constant conversion

From: Christian Brauner <christian.brauner@...ntu.com>

commit 223e660bc7638d126a0e4fbace4f33f2895788c4 upstream.

USER_NOTIF_MAGIC is assigned to int variables in this test so set it to INT_MAX
to avoid warnings:

seccomp_bpf.c: In function ‘user_notification_continue’:
seccomp_bpf.c:3088:26: warning: overflow in implicit constant conversion [-Woverflow]
 #define USER_NOTIF_MAGIC 116983961184613L
                          ^
seccomp_bpf.c:3572:15: note: in expansion of macro ‘USER_NOTIF_MAGIC’
  resp.error = USER_NOTIF_MAGIC;
               ^~~~~~~~~~~~~~~~

Fixes: 6a21cc50f0c7 ("seccomp: add a return code to trap to userspace")
Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
Reviewed-by: Tyler Hicks <tyhicks@...onical.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Will Drewry <wad@...omium.org>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Martin KaFai Lau <kafai@...com>
Cc: Song Liu <songliubraving@...com>
Cc: Yonghong Song <yhs@...com>
Cc: Tycho Andersen <tycho@...ho.ws>
Cc: stable@...r.kernel.org
Cc: linux-kselftest@...r.kernel.org
Cc: netdev@...r.kernel.org
Cc: bpf@...r.kernel.org
Reviewed-by: Tycho Andersen <tycho@...ho.ws>
Link: https://lore.kernel.org/r/20190920083007.11475-3-christian.brauner@ubuntu.com
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 tools/testing/selftests/seccomp/seccomp_bpf.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -35,6 +35,7 @@
 #include <stdbool.h>
 #include <string.h>
 #include <time.h>
+#include <limits.h>
 #include <linux/elf.h>
 #include <sys/uio.h>
 #include <sys/utsname.h>
@@ -3077,7 +3078,7 @@ static int user_trap_syscall(int nr, uns
 	return seccomp(SECCOMP_SET_MODE_FILTER, flags, &prog);
 }
 
-#define USER_NOTIF_MAGIC 116983961184613L
+#define USER_NOTIF_MAGIC INT_MAX
 TEST(user_notification_basic)
 {
 	pid_t pid;