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Wong" , linux-xfs@vger.kernel.org Cc: linux-security-module@vger.kernel.org, selinux@vger.kernel.org Subject: [PATCH] xfs: use has_capability_noaudit() instead of capable() where appropriate Date: Tue, 16 Mar 2021 18:32:26 +0100 Message-Id: <20210316173226.2220046-1-omosnace@redhat.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org In cases when a negative result of a capability check doesn't lead to an immediate, user-visible error, only a subtle difference in behavior, it is better to use has_capability_noaudit(current, ...), so that LSMs (e.g. SELinux) don't generate a denial record in the audit log each time the capability status is queried. This patch should cover all such cases in fs/xfs/. Note that I kept the capable(CAP_FSETID) checks, since these will only be executed if the user explicitly tries to set the SUID/SGID bit, and it likely makes sense to log such attempts even if the syscall doesn't fail and just ignores the bits. Signed-off-by: Ondrej Mosnacek --- fs/xfs/xfs_fsmap.c | 4 ++-- fs/xfs/xfs_ioctl.c | 5 ++++- fs/xfs/xfs_iops.c | 6 ++++-- fs/xfs/xfs_xattr.c | 2 +- 4 files changed, 11 insertions(+), 6 deletions(-) diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c index 9ce5e7d5bf8f..14672e7ee535 100644 --- a/fs/xfs/xfs_fsmap.c +++ b/fs/xfs/xfs_fsmap.c @@ -842,8 +842,8 @@ xfs_getfsmap( !xfs_getfsmap_is_valid_device(mp, &head->fmh_keys[1])) return -EINVAL; - use_rmap = capable(CAP_SYS_ADMIN) && - xfs_sb_version_hasrmapbt(&mp->m_sb); + use_rmap = xfs_sb_version_hasrmapbt(&mp->m_sb) && + has_capability_noaudit(current, CAP_SYS_ADMIN); head->fmh_entries = 0; /* Set up our device handlers. */ diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 3fbd98f61ea5..3cfc1a25069c 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1470,8 +1470,11 @@ xfs_ioctl_setattr( if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp) && ip->i_d.di_projid != fa->fsx_projid) { + int flags = has_capability_noaudit(current, CAP_FOWNER) ? + XFS_QMOPT_FORCE_RES : 0; + code = xfs_qm_vop_chown_reserve(tp, ip, NULL, NULL, pdqp, - capable(CAP_FOWNER) ? XFS_QMOPT_FORCE_RES : 0); + flags); if (code) /* out of quota */ goto error_trans_cancel; } diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 67c8dc9de8aa..abbb417c4fbd 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -729,10 +729,12 @@ xfs_setattr_nonsize( if (XFS_IS_QUOTA_RUNNING(mp) && ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) || (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) { + int flags = has_capability_noaudit(current, CAP_FOWNER) ? + XFS_QMOPT_FORCE_RES : 0; + ASSERT(tp); error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp, - NULL, capable(CAP_FOWNER) ? - XFS_QMOPT_FORCE_RES : 0); + NULL, flags); if (error) /* out of quota */ goto out_cancel; } diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c index bca48b308c02..a99d19c2c11f 100644 --- a/fs/xfs/xfs_xattr.c +++ b/fs/xfs/xfs_xattr.c @@ -164,7 +164,7 @@ xfs_xattr_put_listent( * Only show root namespace entries if we are actually allowed to * see them. */ - if (!capable(CAP_SYS_ADMIN)) + if (!has_capability_noaudit(current, CAP_SYS_ADMIN)) return; prefix = XATTR_TRUSTED_PREFIX; -- 2.30.2