From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x226y6gIq+b1TYXNbXElZhbgPQBTD9SaeIvcduKMA7IwskiNELJh3w+6Jhzg33FuAfO87gGAD ARC-Seal: i=1; a=rsa-sha256; t=1519217755; cv=none; d=google.com; s=arc-20160816; b=J2KZ7KVI+U7piK5W6tqOlR9GiKm7baOJ9atkOfaCWCMtyqTmc/76w/q8H4Jb7ozMaH ALkCwjI/Sz3VrpU5s8jj7QY5gziqfdmhZ0f9pKtLb9iprJ2wW98QA+7ZtVK2rLYWVQTk 3yORwlTbZPeappT1wC3UUlW3Ck99LX4ThnYipPZZ8oehEOh6P92R2mw84XND0EeE1WYG HXw4iPRF56Bdqcy45lO+68Xp5FoezaY17IDvbXxfLi/XneIpvuqpvpngsMbNRXq7miWG qsIvPDV/SGGrsduN6fEBB7s0SBIbf1svyoJinpBYWuOUExRv/gWiX35sapCKI2OF9zkR Tk0Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=xsqZ/KbMe8WfbzIHphiM3G07OeWYaW08T9nf12ntvnU=; b=a4K1X1QBVdWI7vjEGYLEkgmoLiFOc/c3fQfr6p3Q7iBMJJj4uBHjB3Ei+QohUQ040G obj2btzj79dDKyTX0wlM2FytDqTn9lWUdjnViBWsOLkKEyQX6z/Vf+Ruaz6ZRKJTAhWv 7UeXAfLwPtebxR4FrYA//d8X68uq8r2IfrC+wtZ18tw/XwlTeAivV5pE8JZfhNz9MST5 kw7M8MRZaLKWnnDZmFphkLOY2O1GSJqvhadgORaqkdXqYblM6EJFsj+42OWgHV8LEMAw fMTyEWiWVT5VkUdThM415nQTZ05GTlriPLevWoJ5t+yCxQatI2tu21VM3E6r7yyGDLXN q+lQ== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eugene Syromiatnikov , Heiko Carstens , Martin Schwidefsky Subject: [PATCH 4.9 42/77] s390: fix handling of -1 in set{,fs}[gu]id16 syscalls Date: Wed, 21 Feb 2018 13:48:51 +0100 Message-Id: <20180221124433.964726137@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180221124432.172390020@linuxfoundation.org> References: <20180221124432.172390020@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1593014683983574350?= X-GMAIL-MSGID: =?utf-8?q?1593015277442871817?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eugene Syromiatnikov commit 6dd0d2d22aa363fec075cb2577ba273ac8462e94 upstream. For some reason, the implementation of some 16-bit ID system calls (namely, setuid16/setgid16 and setfsuid16/setfsgid16) used type cast instead of low2highgid/low2highuid macros for converting [GU]IDs, which led to incorrect handling of value of -1 (which ought to be considered invalid). Discovered by strace test suite. Cc: stable@vger.kernel.org Signed-off-by: Eugene Syromiatnikov Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/kernel/compat_linux.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/arch/s390/kernel/compat_linux.c +++ b/arch/s390/kernel/compat_linux.c @@ -110,7 +110,7 @@ COMPAT_SYSCALL_DEFINE2(s390_setregid16, COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid) { - return sys_setgid((gid_t)gid); + return sys_setgid(low2highgid(gid)); } COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid) @@ -120,7 +120,7 @@ COMPAT_SYSCALL_DEFINE2(s390_setreuid16, COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid) { - return sys_setuid((uid_t)uid); + return sys_setuid(low2highuid(uid)); } COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid) @@ -173,12 +173,12 @@ COMPAT_SYSCALL_DEFINE3(s390_getresgid16, COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid) { - return sys_setfsuid((uid_t)uid); + return sys_setfsuid(low2highuid(uid)); } COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid) { - return sys_setfsgid((gid_t)gid); + return sys_setfsgid(low2highgid(gid)); } static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)