| Message ID | YfGwggaTu8imJ0uc@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | security, lsm: dentry_init_security() Handle multi LSM registration | expand |
On Wed, 2022-01-26 at 15:35 -0500, Vivek Goyal wrote: > A ceph user has reported that ceph is crashing with kernel NULL pointer > dereference. Following is the backtrace. > > /proc/version: Linux version 5.16.2-arch1-1 (linux@archlinux) (gcc (GCC) > 11.1.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Thu, 20 Jan 2022 > 16:18:29 +0000 > distro / arch: Arch Linux / x86_64 > SELinux is not enabled > ceph cluster version: 16.2.7 (dd0603118f56ab514f133c8d2e3adfc983942503) > > relevant dmesg output: > [ 30.947129] BUG: kernel NULL pointer dereference, address: > 0000000000000000 > [ 30.947206] #PF: supervisor read access in kernel mode > [ 30.947258] #PF: error_code(0x0000) - not-present page > [ 30.947310] PGD 0 P4D 0 > [ 30.947342] Oops: 0000 [#1] PREEMPT SMP PTI > [ 30.947388] CPU: 5 PID: 778 Comm: touch Not tainted 5.16.2-arch1-1 #1 > 86fbf2c313cc37a553d65deb81d98e9dcc2a3659 > [ 30.947486] Hardware name: Gigabyte Technology Co., Ltd. B365M > DS3H/B365M DS3H, BIOS F5 08/13/2019 > [ 30.947569] RIP: 0010:strlen+0x0/0x20 > [ 30.947616] Code: b6 07 38 d0 74 16 48 83 c7 01 84 c0 74 05 48 39 f7 75 > ec 31 c0 31 d2 89 d6 89 d7 c3 48 89 f8 31 d2 89 d6 89 d7 c3 0 > f 1f 40 00 <80> 3f 00 74 12 48 89 f8 48 83 c0 01 80 38 00 75 f7 48 29 f8 31 > ff > [ 30.947782] RSP: 0018:ffffa4ed80ffbbb8 EFLAGS: 00010246 > [ 30.947836] RAX: 0000000000000000 RBX: ffffa4ed80ffbc60 RCX: > 0000000000000000 > [ 30.947904] RDX: 0000000000000000 RSI: 0000000000000000 RDI: > 0000000000000000 > [ 30.947971] RBP: ffff94b0d15c0ae0 R08: 0000000000000000 R09: > 0000000000000000 > [ 30.948040] R10: 0000000000000000 R11: 0000000000000000 R12: > 0000000000000000 > [ 30.948106] R13: 0000000000000001 R14: ffffa4ed80ffbc60 R15: > 0000000000000000 > [ 30.948174] FS: 00007fc7520f0740(0000) GS:ffff94b7ced40000(0000) > knlGS:0000000000000000 > [ 30.948252] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 30.948308] CR2: 0000000000000000 CR3: 0000000104a40001 CR4: > 00000000003706e0 > [ 30.948376] Call Trace: > [ 30.948404] <TASK> > [ 30.948431] ceph_security_init_secctx+0x7b/0x240 [ceph > 49f9c4b9bf5be8760f19f1747e26da33920bce4b] > [ 30.948582] ceph_atomic_open+0x51e/0x8a0 [ceph > 49f9c4b9bf5be8760f19f1747e26da33920bce4b] > [ 30.948708] ? get_cached_acl+0x4d/0xa0 > [ 30.948759] path_openat+0x60d/0x1030 > [ 30.948809] do_filp_open+0xa5/0x150 > [ 30.948859] do_sys_openat2+0xc4/0x190 > [ 30.948904] __x64_sys_openat+0x53/0xa0 > [ 30.948948] do_syscall_64+0x5c/0x90 > [ 30.948989] ? exc_page_fault+0x72/0x180 > [ 30.949034] entry_SYSCALL_64_after_hwframe+0x44/0xae > [ 30.949091] RIP: 0033:0x7fc7521e25bb > [ 30.950849] Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 18 00 > 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 0 > 0 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 54 24 28 64 48 2b 14 > 25 > > Core of the problem is that ceph checks for return code from > security_dentry_init_security() and if return code is 0, it assumes > everything is fine and continues to call strlen(name), which crashes. > > Typically SELinux LSM returns 0 and sets name to "security.selinux" and > it is not a problem. Or if selinux is not compiled in or disabled, it > returns -EOPNOTSUP and ceph deals with it. > > But somehow in this configuration, 0 is being returned and "name" is > not being initialized and that's creating the problem. > > Our suspicion is that BPF LSM is registering a hook for > dentry_init_security() and returns hook default of 0. > > LSM_HOOK(int, 0, dentry_init_security, struct dentry *dentry,...) > > I have not been able to reproduce it just by doing CONFIG_BPF_LSM=y. > Stephen has tested the patch though and confirms it solves the problem > for him. > > dentry_init_security() is written in such a way that it expects only one > LSM to register the hook. Atleast that's the expectation with current code. > > If another LSM returns a hook and returns default, it will simply return > 0 as of now and that will break ceph. > > Hence, suggestion is that change semantics of this hook a bit. If there > are no LSMs or no LSM is taking ownership and initializing security context, > then return -EOPNOTSUP. Also allow at max one LSM to initialize security > context. This hook can't deal with multiple LSMs trying to init security > context. This patch implements this new behavior. > > Reported-by: Stephen Muth <smuth4@gmail.com> > Tested-by: Stephen Muth <smuth4@gmail.com> > Suggested-by: Casey Schaufler <casey@schaufler-ca.com> > Acked-by: Casey Schaufler <casey@schaufler-ca.com> > Reviewed-by: Serge Hallyn <serge@hallyn.com> > Cc: Jeff Layton <jlayton@kernel.org> > Cc: Christian Brauner <brauner@kernel.org> > Cc: Paul Moore <paul@paul-moore.com> > Cc: <stable@vger.kernel.org> # 5.16.0 > Signed-off-by: Vivek Goyal <vgoyal@redhat.com> > --- > include/linux/lsm_hook_defs.h | 2 +- > security/security.c | 15 +++++++++++++-- > 2 files changed, 14 insertions(+), 3 deletions(-) > > Index: redhat-linux/include/linux/lsm_hook_defs.h > =================================================================== > --- redhat-linux.orig/include/linux/lsm_hook_defs.h 2022-01-24 14:56:14.338030140 -0500 > +++ redhat-linux/include/linux/lsm_hook_defs.h 2022-01-25 18:48:46.917496696 -0500 > @@ -80,7 +80,7 @@ LSM_HOOK(int, 0, sb_clone_mnt_opts, cons > unsigned long *set_kern_flags) > LSM_HOOK(int, 0, move_mount, const struct path *from_path, > const struct path *to_path) > -LSM_HOOK(int, 0, dentry_init_security, struct dentry *dentry, > +LSM_HOOK(int, -EOPNOTSUPP, dentry_init_security, struct dentry *dentry, > int mode, const struct qstr *name, const char **xattr_name, > void **ctx, u32 *ctxlen) > LSM_HOOK(int, 0, dentry_create_files_as, struct dentry *dentry, int mode, > Index: redhat-linux/security/security.c > =================================================================== > --- redhat-linux.orig/security/security.c 2022-01-25 18:46:59.166496696 -0500 > +++ redhat-linux/security/security.c 2022-01-26 14:31:43.454568468 -0500 > @@ -1048,8 +1048,19 @@ int security_dentry_init_security(struct > const char **xattr_name, void **ctx, > u32 *ctxlen) > { > - return call_int_hook(dentry_init_security, -EOPNOTSUPP, dentry, mode, > - name, xattr_name, ctx, ctxlen); > + struct security_hook_list *hp; > + int rc; > + > + /* > + * Only one module will provide a security context. > + */ > + hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security, list) { > + rc = hp->hook.dentry_init_security(dentry, mode, name, > + xattr_name, ctx, ctxlen); > + if (rc != LSM_RET_DEFAULT(dentry_init_security)) > + return rc; > + } > + return LSM_RET_DEFAULT(dentry_init_security); > } > EXPORT_SYMBOL(security_dentry_init_security); > > Reviewed-by: Jeff Layton <jlayton@kernel.org>
On Wed, Jan 26, 2022 at 3:35 PM Vivek Goyal <vgoyal@redhat.com> wrote: > > A ceph user has reported that ceph is crashing with kernel NULL pointer > dereference. Following is the backtrace. > > /proc/version: Linux version 5.16.2-arch1-1 (linux@archlinux) (gcc (GCC) > 11.1.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Thu, 20 Jan 2022 > 16:18:29 +0000 > distro / arch: Arch Linux / x86_64 > SELinux is not enabled > ceph cluster version: 16.2.7 (dd0603118f56ab514f133c8d2e3adfc983942503) > > relevant dmesg output: > [ 30.947129] BUG: kernel NULL pointer dereference, address: > 0000000000000000 > [ 30.947206] #PF: supervisor read access in kernel mode > [ 30.947258] #PF: error_code(0x0000) - not-present page > [ 30.947310] PGD 0 P4D 0 > [ 30.947342] Oops: 0000 [#1] PREEMPT SMP PTI > [ 30.947388] CPU: 5 PID: 778 Comm: touch Not tainted 5.16.2-arch1-1 #1 > 86fbf2c313cc37a553d65deb81d98e9dcc2a3659 > [ 30.947486] Hardware name: Gigabyte Technology Co., Ltd. B365M > DS3H/B365M DS3H, BIOS F5 08/13/2019 > [ 30.947569] RIP: 0010:strlen+0x0/0x20 > [ 30.947616] Code: b6 07 38 d0 74 16 48 83 c7 01 84 c0 74 05 48 39 f7 75 > ec 31 c0 31 d2 89 d6 89 d7 c3 48 89 f8 31 d2 89 d6 89 d7 c3 0 > f 1f 40 00 <80> 3f 00 74 12 48 89 f8 48 83 c0 01 80 38 00 75 f7 48 29 f8 31 > ff > [ 30.947782] RSP: 0018:ffffa4ed80ffbbb8 EFLAGS: 00010246 > [ 30.947836] RAX: 0000000000000000 RBX: ffffa4ed80ffbc60 RCX: > 0000000000000000 > [ 30.947904] RDX: 0000000000000000 RSI: 0000000000000000 RDI: > 0000000000000000 > [ 30.947971] RBP: ffff94b0d15c0ae0 R08: 0000000000000000 R09: > 0000000000000000 > [ 30.948040] R10: 0000000000000000 R11: 0000000000000000 R12: > 0000000000000000 > [ 30.948106] R13: 0000000000000001 R14: ffffa4ed80ffbc60 R15: > 0000000000000000 > [ 30.948174] FS: 00007fc7520f0740(0000) GS:ffff94b7ced40000(0000) > knlGS:0000000000000000 > [ 30.948252] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 30.948308] CR2: 0000000000000000 CR3: 0000000104a40001 CR4: > 00000000003706e0 > [ 30.948376] Call Trace: > [ 30.948404] <TASK> > [ 30.948431] ceph_security_init_secctx+0x7b/0x240 [ceph > 49f9c4b9bf5be8760f19f1747e26da33920bce4b] > [ 30.948582] ceph_atomic_open+0x51e/0x8a0 [ceph > 49f9c4b9bf5be8760f19f1747e26da33920bce4b] > [ 30.948708] ? get_cached_acl+0x4d/0xa0 > [ 30.948759] path_openat+0x60d/0x1030 > [ 30.948809] do_filp_open+0xa5/0x150 > [ 30.948859] do_sys_openat2+0xc4/0x190 > [ 30.948904] __x64_sys_openat+0x53/0xa0 > [ 30.948948] do_syscall_64+0x5c/0x90 > [ 30.948989] ? exc_page_fault+0x72/0x180 > [ 30.949034] entry_SYSCALL_64_after_hwframe+0x44/0xae > [ 30.949091] RIP: 0033:0x7fc7521e25bb > [ 30.950849] Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 18 00 > 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 0 > 0 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 54 24 28 64 48 2b 14 > 25 > > Core of the problem is that ceph checks for return code from > security_dentry_init_security() and if return code is 0, it assumes > everything is fine and continues to call strlen(name), which crashes. > > Typically SELinux LSM returns 0 and sets name to "security.selinux" and > it is not a problem. Or if selinux is not compiled in or disabled, it > returns -EOPNOTSUP and ceph deals with it. > > But somehow in this configuration, 0 is being returned and "name" is > not being initialized and that's creating the problem. > > Our suspicion is that BPF LSM is registering a hook for > dentry_init_security() and returns hook default of 0. > > LSM_HOOK(int, 0, dentry_init_security, struct dentry *dentry,...) > > I have not been able to reproduce it just by doing CONFIG_BPF_LSM=y. > Stephen has tested the patch though and confirms it solves the problem > for him. > > dentry_init_security() is written in such a way that it expects only one > LSM to register the hook. Atleast that's the expectation with current code. > > If another LSM returns a hook and returns default, it will simply return > 0 as of now and that will break ceph. > > Hence, suggestion is that change semantics of this hook a bit. If there > are no LSMs or no LSM is taking ownership and initializing security context, > then return -EOPNOTSUP. Also allow at max one LSM to initialize security > context. This hook can't deal with multiple LSMs trying to init security > context. This patch implements this new behavior. > > Reported-by: Stephen Muth <smuth4@gmail.com> > Tested-by: Stephen Muth <smuth4@gmail.com> > Suggested-by: Casey Schaufler <casey@schaufler-ca.com> > Acked-by: Casey Schaufler <casey@schaufler-ca.com> > Reviewed-by: Serge Hallyn <serge@hallyn.com> > Cc: Jeff Layton <jlayton@kernel.org> > Cc: Christian Brauner <brauner@kernel.org> > Cc: Paul Moore <paul@paul-moore.com> > Cc: <stable@vger.kernel.org> # 5.16.0 > Signed-off-by: Vivek Goyal <vgoyal@redhat.com> > --- > include/linux/lsm_hook_defs.h | 2 +- > security/security.c | 15 +++++++++++++-- > 2 files changed, 14 insertions(+), 3 deletions(-) Thanks for putting this patch together Vivek. Acked-by: Paul Moore <paul@paul-moore.com> > Index: redhat-linux/include/linux/lsm_hook_defs.h > =================================================================== > --- redhat-linux.orig/include/linux/lsm_hook_defs.h 2022-01-24 14:56:14.338030140 -0500 > +++ redhat-linux/include/linux/lsm_hook_defs.h 2022-01-25 18:48:46.917496696 -0500 > @@ -80,7 +80,7 @@ LSM_HOOK(int, 0, sb_clone_mnt_opts, cons > unsigned long *set_kern_flags) > LSM_HOOK(int, 0, move_mount, const struct path *from_path, > const struct path *to_path) > -LSM_HOOK(int, 0, dentry_init_security, struct dentry *dentry, > +LSM_HOOK(int, -EOPNOTSUPP, dentry_init_security, struct dentry *dentry, > int mode, const struct qstr *name, const char **xattr_name, > void **ctx, u32 *ctxlen) > LSM_HOOK(int, 0, dentry_create_files_as, struct dentry *dentry, int mode, > Index: redhat-linux/security/security.c > =================================================================== > --- redhat-linux.orig/security/security.c 2022-01-25 18:46:59.166496696 -0500 > +++ redhat-linux/security/security.c 2022-01-26 14:31:43.454568468 -0500 > @@ -1048,8 +1048,19 @@ int security_dentry_init_security(struct > const char **xattr_name, void **ctx, > u32 *ctxlen) > { > - return call_int_hook(dentry_init_security, -EOPNOTSUPP, dentry, mode, > - name, xattr_name, ctx, ctxlen); > + struct security_hook_list *hp; > + int rc; > + > + /* > + * Only one module will provide a security context. > + */ > + hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security, list) { > + rc = hp->hook.dentry_init_security(dentry, mode, name, > + xattr_name, ctx, ctxlen); > + if (rc != LSM_RET_DEFAULT(dentry_init_security)) > + return rc; > + } > + return LSM_RET_DEFAULT(dentry_init_security); > } > EXPORT_SYMBOL(security_dentry_init_security);
On Wed, Jan 26, 2022 at 03:35:14PM -0500, Vivek Goyal wrote: > A ceph user has reported that ceph is crashing with kernel NULL pointer > dereference. Following is the backtrace. > > /proc/version: Linux version 5.16.2-arch1-1 (linux@archlinux) (gcc (GCC) > 11.1.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Thu, 20 Jan 2022 > 16:18:29 +0000 > distro / arch: Arch Linux / x86_64 > SELinux is not enabled > ceph cluster version: 16.2.7 (dd0603118f56ab514f133c8d2e3adfc983942503) > > relevant dmesg output: > [ 30.947129] BUG: kernel NULL pointer dereference, address: > 0000000000000000 > [ 30.947206] #PF: supervisor read access in kernel mode > [ 30.947258] #PF: error_code(0x0000) - not-present page > [ 30.947310] PGD 0 P4D 0 > [ 30.947342] Oops: 0000 [#1] PREEMPT SMP PTI > [ 30.947388] CPU: 5 PID: 778 Comm: touch Not tainted 5.16.2-arch1-1 #1 > 86fbf2c313cc37a553d65deb81d98e9dcc2a3659 > [ 30.947486] Hardware name: Gigabyte Technology Co., Ltd. B365M > DS3H/B365M DS3H, BIOS F5 08/13/2019 > [ 30.947569] RIP: 0010:strlen+0x0/0x20 > [ 30.947616] Code: b6 07 38 d0 74 16 48 83 c7 01 84 c0 74 05 48 39 f7 75 > ec 31 c0 31 d2 89 d6 89 d7 c3 48 89 f8 31 d2 89 d6 89 d7 c3 0 > f 1f 40 00 <80> 3f 00 74 12 48 89 f8 48 83 c0 01 80 38 00 75 f7 48 29 f8 31 > ff > [ 30.947782] RSP: 0018:ffffa4ed80ffbbb8 EFLAGS: 00010246 > [ 30.947836] RAX: 0000000000000000 RBX: ffffa4ed80ffbc60 RCX: > 0000000000000000 > [ 30.947904] RDX: 0000000000000000 RSI: 0000000000000000 RDI: > 0000000000000000 > [ 30.947971] RBP: ffff94b0d15c0ae0 R08: 0000000000000000 R09: > 0000000000000000 > [ 30.948040] R10: 0000000000000000 R11: 0000000000000000 R12: > 0000000000000000 > [ 30.948106] R13: 0000000000000001 R14: ffffa4ed80ffbc60 R15: > 0000000000000000 > [ 30.948174] FS: 00007fc7520f0740(0000) GS:ffff94b7ced40000(0000) > knlGS:0000000000000000 > [ 30.948252] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 30.948308] CR2: 0000000000000000 CR3: 0000000104a40001 CR4: > 00000000003706e0 > [ 30.948376] Call Trace: > [ 30.948404] <TASK> > [ 30.948431] ceph_security_init_secctx+0x7b/0x240 [ceph > 49f9c4b9bf5be8760f19f1747e26da33920bce4b] > [ 30.948582] ceph_atomic_open+0x51e/0x8a0 [ceph > 49f9c4b9bf5be8760f19f1747e26da33920bce4b] > [ 30.948708] ? get_cached_acl+0x4d/0xa0 > [ 30.948759] path_openat+0x60d/0x1030 > [ 30.948809] do_filp_open+0xa5/0x150 > [ 30.948859] do_sys_openat2+0xc4/0x190 > [ 30.948904] __x64_sys_openat+0x53/0xa0 > [ 30.948948] do_syscall_64+0x5c/0x90 > [ 30.948989] ? exc_page_fault+0x72/0x180 > [ 30.949034] entry_SYSCALL_64_after_hwframe+0x44/0xae > [ 30.949091] RIP: 0033:0x7fc7521e25bb > [ 30.950849] Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 18 00 > 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 0 > 0 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 54 24 28 64 48 2b 14 > 25 > > Core of the problem is that ceph checks for return code from > security_dentry_init_security() and if return code is 0, it assumes > everything is fine and continues to call strlen(name), which crashes. > > Typically SELinux LSM returns 0 and sets name to "security.selinux" and > it is not a problem. Or if selinux is not compiled in or disabled, it > returns -EOPNOTSUP and ceph deals with it. > > But somehow in this configuration, 0 is being returned and "name" is > not being initialized and that's creating the problem. > > Our suspicion is that BPF LSM is registering a hook for > dentry_init_security() and returns hook default of 0. > > LSM_HOOK(int, 0, dentry_init_security, struct dentry *dentry,...) > > I have not been able to reproduce it just by doing CONFIG_BPF_LSM=y. > Stephen has tested the patch though and confirms it solves the problem > for him. > > dentry_init_security() is written in such a way that it expects only one > LSM to register the hook. Atleast that's the expectation with current code. > > If another LSM returns a hook and returns default, it will simply return > 0 as of now and that will break ceph. > > Hence, suggestion is that change semantics of this hook a bit. If there > are no LSMs or no LSM is taking ownership and initializing security context, > then return -EOPNOTSUP. Also allow at max one LSM to initialize security > context. This hook can't deal with multiple LSMs trying to init security > context. This patch implements this new behavior. > > Reported-by: Stephen Muth <smuth4@gmail.com> > Tested-by: Stephen Muth <smuth4@gmail.com> > Suggested-by: Casey Schaufler <casey@schaufler-ca.com> > Acked-by: Casey Schaufler <casey@schaufler-ca.com> > Reviewed-by: Serge Hallyn <serge@hallyn.com> > Cc: Jeff Layton <jlayton@kernel.org> > Cc: Christian Brauner <brauner@kernel.org> > Cc: Paul Moore <paul@paul-moore.com> > Cc: <stable@vger.kernel.org> # 5.16.0 > Signed-off-by: Vivek Goyal <vgoyal@redhat.com> > --- Looks good, Acked-by: Christian Brauner <brauner@kernel.org>
Index: redhat-linux/include/linux/lsm_hook_defs.h =================================================================== --- redhat-linux.orig/include/linux/lsm_hook_defs.h 2022-01-24 14:56:14.338030140 -0500 +++ redhat-linux/include/linux/lsm_hook_defs.h 2022-01-25 18:48:46.917496696 -0500 @@ -80,7 +80,7 @@ LSM_HOOK(int, 0, sb_clone_mnt_opts, cons unsigned long *set_kern_flags) LSM_HOOK(int, 0, move_mount, const struct path *from_path, const struct path *to_path) -LSM_HOOK(int, 0, dentry_init_security, struct dentry *dentry, +LSM_HOOK(int, -EOPNOTSUPP, dentry_init_security, struct dentry *dentry, int mode, const struct qstr *name, const char **xattr_name, void **ctx, u32 *ctxlen) LSM_HOOK(int, 0, dentry_create_files_as, struct dentry *dentry, int mode, Index: redhat-linux/security/security.c =================================================================== --- redhat-linux.orig/security/security.c 2022-01-25 18:46:59.166496696 -0500 +++ redhat-linux/security/security.c 2022-01-26 14:31:43.454568468 -0500 @@ -1048,8 +1048,19 @@ int security_dentry_init_security(struct const char **xattr_name, void **ctx, u32 *ctxlen) { - return call_int_hook(dentry_init_security, -EOPNOTSUPP, dentry, mode, - name, xattr_name, ctx, ctxlen); + struct security_hook_list *hp; + int rc; + + /* + * Only one module will provide a security context. + */ + hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security, list) { + rc = hp->hook.dentry_init_security(dentry, mode, name, + xattr_name, ctx, ctxlen); + if (rc != LSM_RET_DEFAULT(dentry_init_security)) + return rc; + } + return LSM_RET_DEFAULT(dentry_init_security); } EXPORT_SYMBOL(security_dentry_init_security);