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David Howells d80a8f1b58 vfs, security: Fix automount superblock LSM init problem, preventing NFS sb sharing 
When NFS superblocks are created by automounting, their LSM parameters
aren't set in the fs_context struct prior to sget_fc() being called,
leading to failure to match existing superblocks.

This bug leads to messages like the following appearing in dmesg when
fscache is enabled:

    NFS: Cache volume key already in use (nfs,4.2,2,108,106a8c0,1,,,,100000,100000,2ee,3a98,1d4c,3a98,1)

Fix this by adding a new LSM hook to load fc->security for submount
creation.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/165962680944.3334508.6610023900349142034.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/165962729225.3357250.14350728846471527137.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/165970659095.2812394.6868894171102318796.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/166133579016.3678898.6283195019480567275.stgit@warthog.procyon.org.uk/ # v4
Link: https://lore.kernel.org/r/217595.1662033775@warthog.procyon.org.uk/ # v5
Fixes: 9bc61ab18b ("vfs: Introduce fs_context, switch vfs_kern_mount() to it.")
Fixes: 779df6a548 ("NFS: Ensure security label is set for root inode")
Tested-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Acked-by: "Christian Brauner (Microsoft)" <brauner@kernel.org>
Acked-by: Paul Moore <paul@paul-moore.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Message-Id: <20230808-master-v9-1-e0ecde888221@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
2023-08-15 08:32:30 +02:00
..
acpi More ACPI updates for 6.5-rc1 2023-07-06 22:25:06 -07:00
asm-generic RISC-V Patches for the 6.5 Merge Window, Part 2 2023-07-07 10:07:19 -07:00
clocksource clocksource: hyper-v: Adjust hv_read_tsc_page_tsc() to avoid special casing U64_MAX 2023-06-05 21:11:07 +02:00
crypto This update includes the following changes: 2023-06-30 21:27:13 -07:00
drm Merge tag 'drm-msm-next-2023-06-18' of https://gitlab.freedesktop.org/drm/msm into drm-next 2023-06-19 16:01:46 +10:00
dt-bindings Another set of clk driver updates and fixes for the merge window. The 2023-07-04 11:07:45 -07:00
keys KEYS: Add forward declaration in asymmetric-parser.h 2023-06-23 16:15:37 +08:00
kunit kunit: Move kunit_abort() call out of kunit_do_failed_assertion() 2023-06-01 13:04:46 -06:00
kvm Common KVM changes for 6.5: 2023-07-01 07:07:55 -04:00
linux vfs, security: Fix automount superblock LSM init problem, preventing NFS sb sharing 2023-08-15 08:32:30 +02:00
math-emu
media media updates for v6.5-rc1 2023-07-05 10:42:32 -07:00
memory
misc
net Including fixes from bluetooth, bpf and wireguard. 2023-07-05 15:44:45 -07:00
pcmcia
ras
rdma rdma: fix INFINIBAND_USER_ACCESS dependency 2023-07-03 16:55:04 -07:00
rv
scsi SCSI misc on 20230629 2023-06-30 11:57:07 -07:00
soc Including fixes from bluetooth, bpf and wireguard. 2023-07-05 15:44:45 -07:00
sound ASoC: Updates for v6.5 2023-06-26 15:38:02 +02:00
target SCSI misc on 20230629 2023-06-30 11:57:07 -07:00
trace Including fixes from bluetooth, bpf and wireguard. 2023-07-05 15:44:45 -07:00
uapi hardening fixes for v6.5-rc1 2023-07-08 12:08:39 -07:00
ufs SCSI misc on 20230629 2023-06-30 11:57:07 -07:00
vdso
video sticon/parisc: Fix STI console on 64-bit only machines 2023-06-30 17:14:14 +02:00
xen x86: xen: add missing prototypes 2023-06-26 07:47:11 +02:00