linux.git/security, branch master

Merge tag 'landlock-7.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux

2026-07-16T20:22:17+00:00

Pull landlock fix from Mickaël Salaün: "This fixes TCP Fast Open support, specific test environments, and doc warnings" * tag 'landlock-7.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux: selftests/landlock: Skip scoped_signal subtest with MSG_OOB if not available selftests/landlock: Fix screwed up pointers in the scoped_signal_test landlock: Update formatting landlock: Fix kernel-doc for the nested quiet layer flag selftests/landlock: Add test for TCP fast open landlock: Fix TCP Fast Open connection bypass

Merge tag 'selinux-pr-20260710' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

2026-07-11T01:59:29+00:00

Pull selinux fixes from Paul Moore: "Two small SELinux patches to fix a missing permission check for TCP Fast Open operations and fix a socket lookup issue with SCTP ASCONF operations" * tag 'selinux-pr-20260710' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux: selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() selinux: check connect-related permissions on TCP Fast Open

landlock: Update formatting

2026-07-10T10:59:10+00:00

Following commit 99df2a8eba34 ("clang-format: fix formatting of guard() and scoped_guard() statements"), update scoped_guard() formatting. Also, see the related fix [1]. Cc: Günther Noack Cc: Miguel Ojeda Link: https://lore.kernel.org/r/20260708105713.2073335-1-mic@digikod.net [1] Link: https://patch.msgid.link/20260708110635.2083515-1-mic@digikod.net Reviewed-by: Günther Noack Signed-off-by: Mickaël Salaün

landlock: Fix kernel-doc for the nested quiet layer flag

2026-07-10T10:59:09+00:00

kernel-doc emits "Excess struct member 'quiet' description in 'landlock_layer'" because "quiet" is a bitfield inside the named nested struct "flags", but its inline comment used the bare member name "@quiet:", which kernel-doc attributes to the enclosing landlock_layer. Use the canonical dotted notation "@flags.quiet:" so kernel-doc resolves the nested member, and include it in the generated documentation. Cc: Justin Suess Cc: Tingmao Wang Fixes: a260c0055665 ("landlock: Add a place for flags to layer rules") Link: https://patch.msgid.link/20260703141711.2016964-1-mic@digikod.net Signed-off-by: Mickaël Salaün

landlock: Fix TCP Fast Open connection bypass

2026-07-10T10:59:07+00:00

The documentation of the socket_connect() LSM hook states that it controls connecting a socket to a remote address. It has not been the case since the addition of TCP Fast Open (RFC 7413) support, which allows opening a TCP connection (thus, setting a socket's destination address) via the MSG_FASTOPEN flag passed to sendto()/sendmsg()/sendmmsg(). The problem then got duplicated into MPTCP. Landlock did not take it into account when its TCP support was added, leaving a bypass of TCP connect policy. Ideally a call to the LSM hook would be added in the fastopen code path, in order to fix this generically. But connect() hooks are designed to run with the socket locked, unlike sendmsg() hooks. Closes: https://github.com/landlock-lsm/linux/issues/41 Fixes: fff69fb03dde ("landlock: Support network rules with TCP bind and connect") Signed-off-by: Matthieu Buffet Link: https://patch.msgid.link/20260701214628.33319-1-matthieu@buffet.re Cc: stable@vger.kernel.org [mic: Wrap commit message] Signed-off-by: Mickaël Salaün

selinux: avoid sk_socket dereference in selinux_sctp_bind_connect()

2026-07-01T22:22:22+00:00

selinux_sctp_bind_connect() dereferences sk->sk_socket to pass a struct socket * to selinux_socket_bind() and selinux_socket_connect_helper(). However, when the hook is invoked from the ASCONF softirq path (sctp_process_asconf), there is no file reference guaranteeing that sk->sk_socket is non-NULL. The setsockopt callers (bindx, connectx, set_primary, sendmsg connect) hold a file reference and are not affected. Both selinux_socket_bind() and selinux_socket_connect_helper() immediately resolve sock->sk, never using the struct socket * for anything else. Refactor the inner logic into helpers that take a struct sock * directly so that selinux_sctp_bind_connect() never needs to touch sk->sk_socket at all. Cc: stable@vger.kernel.org Fixes: d452930fd3b9 ("selinux: Add SCTP support") Suggested-by: Stephen Smalley Signed-off-by: Tristan Madani Reviewed-by: Stephen Smalley Tested-by: Stephen Smalley Signed-off-by: Paul Moore

selinux: check connect-related permissions on TCP Fast Open

2026-07-01T21:09:53+00:00

Similar to Landlock, SELinux was not updated when TCP Fast Open support was introduced to ensure connect-related permissions are checked when using TCP Fast Open. Update its socket_sendmsg() hook to call selinux_socket_connect() when MSG_FASTOPEN is passed. Cc: stable@vger.kernel.org Link: https://lore.kernel.org/linux-security-module/20260616201615.275032-1-hexlabsecurity@proton.me/ Link: https://lore.kernel.org/linux-security-module/20260617180526.15627-2-matthieu@buffet.re/ Reported-by: Bryam Vargas Reported-by: Matthieu Buffet Reported-by: Mikhail Ivanov Signed-off-by: Stephen Smalley Tested-by: Bryam Vargas Signed-off-by: Paul Moore

bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized

2026-06-30T14:31:56+00:00

When CONFIG_BPF_LSM=y is set, BPF inode storage maps (BPF_MAP_TYPE_INODE_STORAGE) are compiled into the kernel. However, if the BPF LSM is not explicitly enabled at boot time (e.g. omitted from the "lsm=" boot parameter), lsm_prepare() is never executed for the BPF LSM. Consequently, the BPF inode security blob offset (bpf_lsm_blob_sizes.lbs_inode) is never initialized and remains at its default compiled size of 8 bytes instead of being updated to a valid offset past the reserved struct rcu_head (typically 16 bytes or more). When a privileged user creates and updates a BPF_MAP_TYPE_INODE_STORAGE map, bpf_inode() evaluates inode->i_security + 8. This erroneously aliases the struct rcu_head.func callback pointer at the beginning of the inode->i_security blob. During subsequent map element cleanup or inode destruction, writing NULL to owner_storage clears the queued RCU callback pointer. When rcu_do_batch() later executes the queued callback, it attempts an instruction fetch at address 0x0, triggering an immediate kernel panic. Fix this by introducing a global bpf_lsm_initialized boolean flag marked with __ro_after_init. Set this flag to true inside bpf_lsm_init() when the LSM framework successfully registers the BPF LSM. Gate map allocation in inode_storage_map_alloc() on this flag, returning -EOPNOTSUPP if the BPF LSM is in turn uninitialized. This fail-fast approach prevents userspace from allocating inode storage maps when the supporting BPF LSM infrastructure is absent, avoiding zombie map states. Fixes: 8ea636848aca ("bpf: Implement bpf_local_storage for inodes") Reported-by: oxsignal Signed-off-by: Matt Bobrowski Signed-off-by: Daniel Borkmann Reviewed-by: Emil Tsalapatis Reviewed-by: Amery Hung Link: https://lore.kernel.org/bpf/20260628201103.3624525-1-mattbobrowski@google.com

Merge tag 'apparmor-pr-2026-06-22' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor

2026-06-24T19:33:40+00:00

Pull apparmor updates from John Johansen: "Another round of bug fixing and some code cleanups, there are no new features. The biggest thing to note is Georgia is being added to help co-maintain apparmor. Cleanups: - replace get_zeroed_page() with kzalloc() - remove unnecessary goto and associated label - change fn_label_build() to return err on failure instead of NULL or err - free rawdata as soon as possible - use explicit instead of implicit flex array in rawdata_f_data - use __label_make_stale in __aa_proxy_redirect - return correct error by propagate -ENOMEM correctly in unpack_table - aa_label_alloc use aa_label_free on alloc failure - add a conditional version of get_newest_label Bug Fixes: - mediate the implicit connect of TCP fast open sendmsg - fix C23ism of label immediately before a declaration - fix kernel-doc warnings - fix spelling mistakes - fix use-after-free in rawdata dedup loop - Fix inverted comparison in cache_hold_inc() - fix uninitialized pointer passed to audit_log_untrustedstring() - don't audit files pointing to aa_null.dentry - put secmark label after secid lookup - fix aa_getprocattr free procattr leak on format failure - release exe file resources on path failure - fail policy unpack on accept2 allocation failure - Fix return in ns_mkdir_op - remove or add symlinks to rawdata according to export_binary - fix NULL pointer dereference in unpack_pdb - fix potential UAF in aa_replace_profiles - grab ns lock and refresh when looking up changehat child profiles - enable differential encoding - check label build before no_new_privs test - conditionally compile get_loaddata_common_ref() - fix unix socket mediation cache update, and leak" * tag 'apparmor-pr-2026-06-22' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor: (35 commits) apparmor: advertise the tcp fast open fix is applied apparmor: mediate the implicit connect of TCP fast open sendmsg apparmor: fix label can not be immediately before a declaration apparmor: fix kernel-doc warnings apparmor: replace get_zeroed_page() with kzalloc() security: apparmor: fix two spelling mistakes apparmor: fix use-after-free in rawdata dedup loop apparmor: Fix inverted comparison in cache_hold_inc() apparmor: fix uninitialised pointer passed to audit_log_untrustedstring() apparmor: don't audit files pointing to aa_null.dentry apparmor: put secmark label after secid lookup apparmor: aa_getprocattr free procattr leak on format failure apparmor: remove unnecessary goto and associated label apparmor: release exe file resources on path failure apparmor: fail policy unpack on accept2 allocation failure apparmor: Fix return in ns_mkdir_op apparmor: remove or add symlinks to rawdata according to export_binary apparmor: fix NULL pointer dereference in unpack_pdb apparmor: make fn_label_build() capable of handling not supported apparmor: change fn_label_build() call to not return NULL ...

apparmor: advertise the tcp fast open fix is applied

2026-06-24T05:15:15+00:00

The fix for tcp-fast-open ensures that the connect permission is being mediated correctly but it didn't add an artifact to the feature set to advertise the fix is available. Add an artifact so that the test suite can identify if the fix has not been properly applied or a new unexpected regression has occurred. Fixes: 4d587cd8a7215 ("apparmor: mediate the implicit connect of TCP fast open sendmsg") Signed-off-by: John Johansen