From eba0549bc7d100691c13384b774346b8aa9cf9a9 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Fri, 25 Feb 2022 16:18:30 -0800 Subject: [PATCH] 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: 7317a03df703f ("xfs: refactor inode ownership change transaction/inode/quota allocation idiom") Fixes: ea9a46e1c4925 ("xfs: only return detailed fsmap info if the caller has CAP_SYS_ADMIN") Signed-off-by: Darrick J. Wong Cc: Dave Chinner Reviewed-by: Ondrej Mosnacek Acked-by: Serge Hallyn Reviewed-by: Eric Sandeen --- fs/xfs/xfs_fsmap.c | 4 ++-- fs/xfs/xfs_ioctl.c | 2 +- fs/xfs/xfs_iops.c | 2 +- kernel/capability.c | 1 + 4 files changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c index 48287caad28b..10e1cb71439e 100644 --- a/fs/xfs/xfs_fsmap.c +++ b/fs/xfs/xfs_fsmap.c @@ -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. */ diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 2515fe8299e1..83481005317a 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -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; diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index b79b3846e71b..a65217f787cf 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -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; diff --git a/kernel/capability.c b/kernel/capability.c index 46a361dde042..765194f5d678 100644 --- a/kernel/capability.c +++ b/kernel/capability.c @@ -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, -- 2.20.1