From patchwork Thu Sep 17 07:41:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11781843 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3A903112E for ; Thu, 17 Sep 2020 07:51:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1392221D41 for ; Thu, 17 Sep 2020 07:51:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="n1v6Fb0S" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726249AbgIQHu5 (ORCPT ); Thu, 17 Sep 2020 03:50:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726153AbgIQHuv (ORCPT ); Thu, 17 Sep 2020 03:50:51 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E4C3C06174A; Thu, 17 Sep 2020 00:50:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=NwPQsZEQkoMniUW7tI70t4UHcepNJDHuOzL+OOVm8IQ=; b=n1v6Fb0SQmGKG4Ec74xjrnz4nv jwDnARKoDlko6ezLoHswaQi4/Dgh5+4QagGT+FLdabYvPVzA93caQsU6XfyfTtclaPVnZCgiPRBl3 Q/shZzZee6HLz69AHR6mlBzyE/Zg1LqQsC7BpAP8uStI5HLM0hAHXsuQz/tPg9KktmB61gMbIGDb+ lzsQAkOK7rABWzcLmcGy2Pj9H6WE3yvcYX4EulJfd5cpEWSoYhe+zCGIEWY/AYwfnzWiijDvwwOKK 26VWwXH1wDn1J/AWCZiQ/mmuybxr0yd3Ru7fZ8wjtsAb/gDlA7VqXYMXV4+6wCgrs+cQC8zSXruhW 2CjqveJQ==; Received: from 089144214092.atnat0023.highway.a1.net ([89.144.214.92] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kIogn-0006ww-37; Thu, 17 Sep 2020 07:50:45 +0000 From: Christoph Hellwig To: x86@kernel.org, Jan Kara Cc: linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, Jan Kara Subject: [PATCH 3/3] quota: simplify the quotactl compat handling Date: Thu, 17 Sep 2020 09:41:59 +0200 Message-Id: <20200917074159.2442167-4-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200917074159.2442167-1-hch@lst.de> References: <20200917074159.2442167-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Fold the misaligned u64 workarounds into the main quotactl flow instead of implementing a separate compat syscall handler. Signed-off-by: Christoph Hellwig Acked-by: Jan Kara --- arch/x86/entry/syscalls/syscall_32.tbl | 2 +- fs/quota/Kconfig | 5 -- fs/quota/Makefile | 1 - fs/quota/compat.c | 120 ------------------------- fs/quota/compat.h | 34 +++++++ fs/quota/quota.c | 73 ++++++++++++--- include/linux/quotaops.h | 3 - kernel/sys_ni.c | 1 - 8 files changed, 94 insertions(+), 145 deletions(-) delete mode 100644 fs/quota/compat.c create mode 100644 fs/quota/compat.h diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index 9d11028736661b..3db3d8823dc899 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -142,7 +142,7 @@ 128 i386 init_module sys_init_module 129 i386 delete_module sys_delete_module 130 i386 get_kernel_syms -131 i386 quotactl sys_quotactl compat_sys_quotactl32 +131 i386 quotactl sys_quotactl 132 i386 getpgid sys_getpgid 133 i386 fchdir sys_fchdir 134 i386 bdflush sys_bdflush diff --git a/fs/quota/Kconfig b/fs/quota/Kconfig index d1ceb76adb71e7..b59cd172b5f97c 100644 --- a/fs/quota/Kconfig +++ b/fs/quota/Kconfig @@ -70,8 +70,3 @@ config QFMT_V2 config QUOTACTL bool default n - -config QUOTACTL_COMPAT - bool - depends on QUOTACTL && COMPAT_FOR_U64_ALIGNMENT - default y diff --git a/fs/quota/Makefile b/fs/quota/Makefile index f2b49d0f0287c9..9160639daffa75 100644 --- a/fs/quota/Makefile +++ b/fs/quota/Makefile @@ -4,5 +4,4 @@ obj-$(CONFIG_QFMT_V1) += quota_v1.o obj-$(CONFIG_QFMT_V2) += quota_v2.o obj-$(CONFIG_QUOTA_TREE) += quota_tree.o obj-$(CONFIG_QUOTACTL) += quota.o kqid.o -obj-$(CONFIG_QUOTACTL_COMPAT) += compat.o obj-$(CONFIG_QUOTA_NETLINK_INTERFACE) += netlink.o diff --git a/fs/quota/compat.c b/fs/quota/compat.c deleted file mode 100644 index c305728576193d..00000000000000 --- a/fs/quota/compat.c +++ /dev/null @@ -1,120 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 - -#include -#include -#include - -/* - * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64) - * and is necessary due to alignment problems. - */ -struct compat_if_dqblk { - compat_u64 dqb_bhardlimit; - compat_u64 dqb_bsoftlimit; - compat_u64 dqb_curspace; - compat_u64 dqb_ihardlimit; - compat_u64 dqb_isoftlimit; - compat_u64 dqb_curinodes; - compat_u64 dqb_btime; - compat_u64 dqb_itime; - compat_uint_t dqb_valid; -}; - -/* XFS structures */ -struct compat_fs_qfilestat { - compat_u64 dqb_bhardlimit; - compat_u64 qfs_nblks; - compat_uint_t qfs_nextents; -}; - -struct compat_fs_quota_stat { - __s8 qs_version; - __u16 qs_flags; - __s8 qs_pad; - struct compat_fs_qfilestat qs_uquota; - struct compat_fs_qfilestat qs_gquota; - compat_uint_t qs_incoredqs; - compat_int_t qs_btimelimit; - compat_int_t qs_itimelimit; - compat_int_t qs_rtbtimelimit; - __u16 qs_bwarnlimit; - __u16 qs_iwarnlimit; -}; - -COMPAT_SYSCALL_DEFINE4(quotactl32, unsigned int, cmd, - const char __user *, special, qid_t, id, - void __user *, addr) -{ - unsigned int cmds; - struct if_dqblk __user *dqblk; - struct compat_if_dqblk __user *compat_dqblk; - struct fs_quota_stat __user *fsqstat; - struct compat_fs_quota_stat __user *compat_fsqstat; - compat_uint_t data; - u16 xdata; - long ret; - - cmds = cmd >> SUBCMDSHIFT; - - switch (cmds) { - case Q_GETQUOTA: - dqblk = compat_alloc_user_space(sizeof(struct if_dqblk)); - compat_dqblk = addr; - ret = kernel_quotactl(cmd, special, id, dqblk); - if (ret) - break; - if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) || - get_user(data, &dqblk->dqb_valid) || - put_user(data, &compat_dqblk->dqb_valid)) - ret = -EFAULT; - break; - case Q_SETQUOTA: - dqblk = compat_alloc_user_space(sizeof(struct if_dqblk)); - compat_dqblk = addr; - ret = -EFAULT; - if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) || - get_user(data, &compat_dqblk->dqb_valid) || - put_user(data, &dqblk->dqb_valid)) - break; - ret = kernel_quotactl(cmd, special, id, dqblk); - break; - case Q_XGETQSTAT: - fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat)); - compat_fsqstat = addr; - ret = kernel_quotactl(cmd, special, id, fsqstat); - if (ret) - break; - ret = -EFAULT; - /* Copying qs_version, qs_flags, qs_pad */ - if (copy_in_user(compat_fsqstat, fsqstat, - offsetof(struct compat_fs_quota_stat, qs_uquota))) - break; - /* Copying qs_uquota */ - if (copy_in_user(&compat_fsqstat->qs_uquota, - &fsqstat->qs_uquota, - sizeof(compat_fsqstat->qs_uquota)) || - get_user(data, &fsqstat->qs_uquota.qfs_nextents) || - put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents)) - break; - /* Copying qs_gquota */ - if (copy_in_user(&compat_fsqstat->qs_gquota, - &fsqstat->qs_gquota, - sizeof(compat_fsqstat->qs_gquota)) || - get_user(data, &fsqstat->qs_gquota.qfs_nextents) || - put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents)) - break; - /* Copying the rest */ - if (copy_in_user(&compat_fsqstat->qs_incoredqs, - &fsqstat->qs_incoredqs, - sizeof(struct compat_fs_quota_stat) - - offsetof(struct compat_fs_quota_stat, qs_incoredqs)) || - get_user(xdata, &fsqstat->qs_iwarnlimit) || - put_user(xdata, &compat_fsqstat->qs_iwarnlimit)) - break; - ret = 0; - break; - default: - ret = kernel_quotactl(cmd, special, id, addr); - } - return ret; -} diff --git a/fs/quota/compat.h b/fs/quota/compat.h new file mode 100644 index 00000000000000..ef7d1e12d650b3 --- /dev/null +++ b/fs/quota/compat.h @@ -0,0 +1,34 @@ +// SPDX-License-Identifier: GPL-2.0 +#include + +struct compat_if_dqblk { + compat_u64 dqb_bhardlimit; + compat_u64 dqb_bsoftlimit; + compat_u64 dqb_curspace; + compat_u64 dqb_ihardlimit; + compat_u64 dqb_isoftlimit; + compat_u64 dqb_curinodes; + compat_u64 dqb_btime; + compat_u64 dqb_itime; + compat_uint_t dqb_valid; +}; + +struct compat_fs_qfilestat { + compat_u64 dqb_bhardlimit; + compat_u64 qfs_nblks; + compat_uint_t qfs_nextents; +}; + +struct compat_fs_quota_stat { + __s8 qs_version; + __u16 qs_flags; + __s8 qs_pad; + struct compat_fs_qfilestat qs_uquota; + struct compat_fs_qfilestat qs_gquota; + compat_uint_t qs_incoredqs; + compat_int_t qs_btimelimit; + compat_int_t qs_itimelimit; + compat_int_t qs_rtbtimelimit; + __u16 qs_bwarnlimit; + __u16 qs_iwarnlimit; +}; diff --git a/fs/quota/quota.c b/fs/quota/quota.c index 47f9e151988b3e..6b37d58f1067d4 100644 --- a/fs/quota/quota.c +++ b/fs/quota/quota.c @@ -19,6 +19,7 @@ #include #include #include +#include "compat.h" static int check_quotactl_permission(struct super_block *sb, int type, int cmd, qid_t id) @@ -211,8 +212,18 @@ static int quota_getquota(struct super_block *sb, int type, qid_t id, if (ret) return ret; copy_to_if_dqblk(&idq, &fdq); - if (copy_to_user(addr, &idq, sizeof(idq))) - return -EFAULT; + + if (compat_need_64bit_alignment_fixup()) { + struct compat_if_dqblk __user *compat_dqblk = addr; + + if (copy_to_user(compat_dqblk, &idq, sizeof(*compat_dqblk))) + return -EFAULT; + if (put_user(idq.dqb_valid, &compat_dqblk->dqb_valid)) + return -EFAULT; + } else { + if (copy_to_user(addr, &idq, sizeof(idq))) + return -EFAULT; + } return 0; } @@ -277,8 +288,16 @@ static int quota_setquota(struct super_block *sb, int type, qid_t id, struct if_dqblk idq; struct kqid qid; - if (copy_from_user(&idq, addr, sizeof(idq))) - return -EFAULT; + if (compat_need_64bit_alignment_fixup()) { + struct compat_if_dqblk __user *compat_dqblk = addr; + + if (copy_from_user(&idq, compat_dqblk, sizeof(*compat_dqblk)) || + get_user(idq.dqb_valid, &compat_dqblk->dqb_valid)) + return -EFAULT; + } else { + if (copy_from_user(&idq, addr, sizeof(idq))) + return -EFAULT; + } if (!sb->s_qcop->set_dqblk) return -ENOSYS; qid = make_kqid(current_user_ns(), type, id); @@ -382,6 +401,33 @@ static int quota_getstate(struct super_block *sb, int type, return 0; } +static int compat_copy_fs_qfilestat(struct compat_fs_qfilestat __user *to, + struct fs_qfilestat *from) +{ + if (copy_to_user(to, from, sizeof(*to)) || + put_user(from->qfs_nextents, &to->qfs_nextents)) + return -EFAULT; + return 0; +} + +static int compat_copy_fs_quota_stat(struct compat_fs_quota_stat __user *to, + struct fs_quota_stat *from) +{ + if (put_user(from->qs_version, &to->qs_version) || + put_user(from->qs_flags, &to->qs_flags) || + put_user(from->qs_pad, &to->qs_pad) || + compat_copy_fs_qfilestat(&to->qs_uquota, &from->qs_uquota) || + compat_copy_fs_qfilestat(&to->qs_gquota, &from->qs_gquota) || + put_user(from->qs_incoredqs, &to->qs_incoredqs) || + put_user(from->qs_btimelimit, &to->qs_btimelimit) || + put_user(from->qs_itimelimit, &to->qs_itimelimit) || + put_user(from->qs_rtbtimelimit, &to->qs_rtbtimelimit) || + put_user(from->qs_bwarnlimit, &to->qs_bwarnlimit) || + put_user(from->qs_iwarnlimit, &to->qs_iwarnlimit)) + return -EFAULT; + return 0; +} + static int quota_getxstate(struct super_block *sb, int type, void __user *addr) { struct fs_quota_stat fqs; @@ -390,9 +436,14 @@ static int quota_getxstate(struct super_block *sb, int type, void __user *addr) if (!sb->s_qcop->get_state) return -ENOSYS; ret = quota_getstate(sb, type, &fqs); - if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) + if (ret) + return ret; + + if (compat_need_64bit_alignment_fixup()) + return compat_copy_fs_quota_stat(addr, &fqs); + if (copy_to_user(addr, &fqs, sizeof(fqs))) return -EFAULT; - return ret; + return 0; } static int quota_getstatev(struct super_block *sb, int type, @@ -816,8 +867,8 @@ static struct super_block *quotactl_block(const char __user *special, int cmd) * calls. Maybe we need to add the process quotas etc. in the future, * but we probably should use rlimits for that. */ -int kernel_quotactl(unsigned int cmd, const char __user *special, - qid_t id, void __user *addr) +SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, + qid_t, id, void __user *, addr) { uint cmds, type; struct super_block *sb = NULL; @@ -871,9 +922,3 @@ int kernel_quotactl(unsigned int cmd, const char __user *special, path_put(pathp); return ret; } - -SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, - qid_t, id, void __user *, addr) -{ - return kernel_quotactl(cmd, special, id, addr); -} diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h index 9cf0cd3dc88c68..a0f6668924d3ef 100644 --- a/include/linux/quotaops.h +++ b/include/linux/quotaops.h @@ -27,9 +27,6 @@ static inline bool is_quota_modification(struct inode *inode, struct iattr *ia) (ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid)); } -int kernel_quotactl(unsigned int cmd, const char __user *special, - qid_t id, void __user *addr); - #if defined(CONFIG_QUOTA) #define quota_error(sb, fmt, args...) \ diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index 4d59775ea79c1e..c925d1e1777efc 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -369,7 +369,6 @@ COND_SYSCALL_COMPAT(fanotify_mark); /* x86 */ COND_SYSCALL(vm86old); COND_SYSCALL(modify_ldt); -COND_SYSCALL_COMPAT(quotactl32); COND_SYSCALL(vm86); COND_SYSCALL(kexec_file_load);