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xfs: don't generate selinux audit messages for capability testing 

There are a few places where we test the current process' capability set
to decide if we're going to be more or less generous with resource
acquisition for a system call.  If the process doesn't have the
capability, we can continue the call, albeit in a degraded mode.

These are /not/ the actual security decisions, so it's not proper to use
capable(), which (in certain selinux setups) causes audit messages to
get logged.  Switch them to has_capability_noaudit.

Fixes: 7317a03df7 ("xfs: refactor inode ownership change transaction/inode/quota allocation idiom")
Fixes: ea9a46e1c4 ("xfs: only return detailed fsmap info if the caller has CAP_SYS_ADMIN")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Cc: Dave Chinner <david@fromorbit.com>
Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
This commit is contained in:
Darrick J. Wong 2022-02-25 16:18:30 -08:00
parent 1a39ae415c
commit eba0549bc7
4 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/xfs/xfs_fsmap.c
View File

@ -864,8 +864,8 @@ xfs_getfsmap(
!xfs_getfsmap_is_valid_device(mp, &head->fmh_keys[1]))
return -EINVAL;
use_rmap = capable(CAP_SYS_ADMIN) &&
xfs_has_rmapbt(mp);
use_rmap = xfs_has_rmapbt(mp) &&
has_capability_noaudit(current, CAP_SYS_ADMIN);
head->fmh_entries = 0;
/* Set up our device handlers. */

2
fs/xfs/xfs_ioctl.c
View File

@ -1189,7 +1189,7 @@ xfs_ioctl_setattr_get_trans(
goto out_error;
error = xfs_trans_alloc_ichange(ip, NULL, NULL, pdqp,
capable(CAP_FOWNER), &tp);
has_capability_noaudit(current, CAP_FOWNER), &tp);
if (error)
goto out_error;

2
fs/xfs/xfs_iops.c
View File

@ -723,7 +723,7 @@ xfs_setattr_nonsize(
}
error = xfs_trans_alloc_ichange(ip, udqp, gdqp, NULL,
capable(CAP_FOWNER), &tp);
has_capability_noaudit(current, CAP_FOWNER), &tp);
if (error)
goto out_dqrele;

1
kernel/capability.c
View File

@ -360,6 +360,7 @@ bool has_capability_noaudit(struct task_struct *t, int cap)
{
return has_ns_capability_noaudit(t, &init_user_ns, cap);
}
EXPORT_SYMBOL(has_capability_noaudit);
static bool ns_capable_common(struct user_namespace *ns,
int cap,