From: Roberto Sassu roberto.sassu@huawei.com
Define four return value flags (LSM_RET_NEG, LSM_RET_ZERO, LSM_RET_ONE, LSM_RET_GT_ONE), one for each interval of interest (< 0, = 0, = 1, > 1).
Redefine the LSM_HOOK() macro to add return value flags as argument, and set the correct flags for each LSM hook.
Implementors of new LSM hooks should do the same as well.
Cc: stable@vger.kernel.org # 5.7.x Fixes: 9d3fdea789c8 ("bpf: lsm: Provide attachment points for BPF LSM programs") Signed-off-by: Roberto Sassu roberto.sassu@huawei.com --- include/linux/bpf_lsm.h | 2 +- include/linux/lsm_hook_defs.h | 779 ++++++++++++++++++++-------------- include/linux/lsm_hooks.h | 9 +- kernel/bpf/bpf_lsm.c | 5 +- security/bpf/hooks.c | 2 +- security/security.c | 4 +- 6 files changed, 466 insertions(+), 335 deletions(-)
diff --git a/include/linux/bpf_lsm.h b/include/linux/bpf_lsm.h index 4bcf76a9bb06..650ab044e705 100644 --- a/include/linux/bpf_lsm.h +++ b/include/linux/bpf_lsm.h @@ -13,7 +13,7 @@
#ifdef CONFIG_BPF_LSM
-#define LSM_HOOK(RET, DEFAULT, NAME, ...) \ +#define LSM_HOOK(RET, DEFAULT, RET_FLAGS, NAME, ...) \ RET bpf_lsm_##NAME(__VA_ARGS__); #include <linux/lsm_hook_defs.h> #undef LSM_HOOK diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index ec119da1d89b..ed8336a5a0d8 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -18,395 +18,520 @@ * The macro LSM_HOOK is used to define the data structures required by * the LSM framework using the pattern: * - * LSM_HOOK(<return_type>, <default_value>, <hook_name>, args...) + * LSM_HOOK(<return_type>, <default_value>, <return_flags>, <hook_name>, args...) * * struct security_hook_heads { - * #define LSM_HOOK(RET, DEFAULT, NAME, ...) struct hlist_head NAME; + * #define LSM_HOOK(RET, DEFAULT, RET_FLAGS, NAME, ...) struct hlist_head NAME; * #include <linux/lsm_hook_defs.h> * #undef LSM_HOOK * }; */ -LSM_HOOK(int, 0, binder_set_context_mgr, const struct cred *mgr) -LSM_HOOK(int, 0, binder_transaction, const struct cred *from, - const struct cred *to) -LSM_HOOK(int, 0, binder_transfer_binder, const struct cred *from, - const struct cred *to) -LSM_HOOK(int, 0, binder_transfer_file, const struct cred *from, - const struct cred *to, struct file *file) -LSM_HOOK(int, 0, ptrace_access_check, struct task_struct *child, - unsigned int mode) -LSM_HOOK(int, 0, ptrace_traceme, struct task_struct *parent) -LSM_HOOK(int, 0, capget, struct task_struct *target, kernel_cap_t *effective, - kernel_cap_t *inheritable, kernel_cap_t *permitted) -LSM_HOOK(int, 0, capset, struct cred *new, const struct cred *old, - const kernel_cap_t *effective, const kernel_cap_t *inheritable, - const kernel_cap_t *permitted) -LSM_HOOK(int, 0, capable, const struct cred *cred, struct user_namespace *ns, - int cap, unsigned int opts) -LSM_HOOK(int, 0, quotactl, int cmds, int type, int id, struct super_block *sb) -LSM_HOOK(int, 0, quota_on, struct dentry *dentry) -LSM_HOOK(int, 0, syslog, int type) -LSM_HOOK(int, 0, settime, const struct timespec64 *ts, - const struct timezone *tz) -LSM_HOOK(int, 0, vm_enough_memory, struct mm_struct *mm, long pages) -LSM_HOOK(int, 0, bprm_creds_for_exec, struct linux_binprm *bprm) -LSM_HOOK(int, 0, bprm_creds_from_file, struct linux_binprm *bprm, struct file *file) -LSM_HOOK(int, 0, bprm_check_security, struct linux_binprm *bprm) -LSM_HOOK(void, LSM_RET_VOID, bprm_committing_creds, struct linux_binprm *bprm) -LSM_HOOK(void, LSM_RET_VOID, bprm_committed_creds, struct linux_binprm *bprm) -LSM_HOOK(int, 0, fs_context_dup, struct fs_context *fc, - struct fs_context *src_sc) -LSM_HOOK(int, -ENOPARAM, fs_context_parse_param, struct fs_context *fc, + +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, binder_set_context_mgr, + const struct cred *mgr) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, binder_transaction, + const struct cred *from, const struct cred *to) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, binder_transfer_binder, + const struct cred *from, const struct cred *to) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, binder_transfer_file, + const struct cred *from, const struct cred *to, struct file *file) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, ptrace_access_check, + struct task_struct *child, unsigned int mode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, ptrace_traceme, + struct task_struct *parent) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, capget, struct task_struct *target, + kernel_cap_t *effective, kernel_cap_t *inheritable, + kernel_cap_t *permitted) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, capset, struct cred *new, + const struct cred *old, const kernel_cap_t *effective, + const kernel_cap_t *inheritable, const kernel_cap_t *permitted) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, capable, const struct cred *cred, + struct user_namespace *ns, int cap, unsigned int opts) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, quotactl, int cmds, int type, + int id, struct super_block *sb) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, quota_on, struct dentry *dentry) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, syslog, int type) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, settime, + const struct timespec64 *ts, const struct timezone *tz) +LSM_HOOK(int, 0, LSM_RET_ZERO | LSM_RET_ONE, vm_enough_memory, + struct mm_struct *mm, long pages) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, bprm_creds_for_exec, + struct linux_binprm *bprm) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, bprm_creds_from_file, + struct linux_binprm *bprm, struct file *file) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, bprm_check_security, + struct linux_binprm *bprm) +LSM_HOOK(void, LSM_RET_VOID, 0, bprm_committing_creds, struct linux_binprm *bprm) +LSM_HOOK(void, LSM_RET_VOID, 0, bprm_committed_creds, struct linux_binprm *bprm) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, fs_context_dup, + struct fs_context *fc, struct fs_context *src_sc) +LSM_HOOK(int, -ENOPARAM, LSM_RET_NEG | LSM_RET_ZERO | LSM_RET_ONE, + fs_context_parse_param, struct fs_context *fc, struct fs_parameter *param) -LSM_HOOK(int, 0, sb_alloc_security, struct super_block *sb) -LSM_HOOK(void, LSM_RET_VOID, sb_delete, struct super_block *sb) -LSM_HOOK(void, LSM_RET_VOID, sb_free_security, struct super_block *sb) -LSM_HOOK(void, LSM_RET_VOID, sb_free_mnt_opts, void *mnt_opts) -LSM_HOOK(int, 0, sb_eat_lsm_opts, char *orig, void **mnt_opts) -LSM_HOOK(int, 0, sb_mnt_opts_compat, struct super_block *sb, void *mnt_opts) -LSM_HOOK(int, 0, sb_remount, struct super_block *sb, void *mnt_opts) -LSM_HOOK(int, 0, sb_kern_mount, struct super_block *sb) -LSM_HOOK(int, 0, sb_show_options, struct seq_file *m, struct super_block *sb) -LSM_HOOK(int, 0, sb_statfs, struct dentry *dentry) -LSM_HOOK(int, 0, sb_mount, const char *dev_name, const struct path *path, - const char *type, unsigned long flags, void *data) -LSM_HOOK(int, 0, sb_umount, struct vfsmount *mnt, int flags) -LSM_HOOK(int, 0, sb_pivotroot, const struct path *old_path, - const struct path *new_path) -LSM_HOOK(int, 0, sb_set_mnt_opts, struct super_block *sb, void *mnt_opts, - unsigned long kern_flags, unsigned long *set_kern_flags) -LSM_HOOK(int, 0, sb_clone_mnt_opts, const struct super_block *oldsb, - struct super_block *newsb, unsigned long kern_flags, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_alloc_security, + struct super_block *sb) +LSM_HOOK(void, LSM_RET_VOID, 0, sb_delete, struct super_block *sb) +LSM_HOOK(void, LSM_RET_VOID, 0, sb_free_security, struct super_block *sb) +LSM_HOOK(void, LSM_RET_VOID, 0, sb_free_mnt_opts, void *mnt_opts) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_eat_lsm_opts, char *orig, + void **mnt_opts) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_mnt_opts_compat, + struct super_block *sb, void *mnt_opts) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_remount, struct super_block *sb, + void *mnt_opts) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_kern_mount, + struct super_block *sb) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_show_options, + struct seq_file *m, struct super_block *sb) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_statfs, struct dentry *dentry) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_mount, const char *dev_name, + const struct path *path, const char *type, unsigned long flags, + void *data) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_umount, struct vfsmount *mnt, + int flags) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_pivotroot, + const struct path *old_path, const struct path *new_path) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_set_mnt_opts, + struct super_block *sb, void *mnt_opts, unsigned long kern_flags, unsigned long *set_kern_flags) -LSM_HOOK(int, 0, move_mount, const struct path *from_path, - const struct path *to_path) -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, - struct qstr *name, const struct cred *old, struct cred *new) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sb_clone_mnt_opts, + const struct super_block *oldsb, struct super_block *newsb, + unsigned long kern_flags, unsigned long *set_kern_flags) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, move_mount, + const struct path *from_path, const struct path *to_path) +LSM_HOOK(int, -EOPNOTSUPP, LSM_RET_NEG | LSM_RET_ZERO, dentry_init_security, + struct dentry *dentry, int mode, const struct qstr *name, + const char **xattr_name, void **ctx, u32 *ctxlen) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, dentry_create_files_as, + struct dentry *dentry, int mode, struct qstr *name, + const struct cred *old, struct cred *new)
#ifdef CONFIG_SECURITY_PATH -LSM_HOOK(int, 0, path_unlink, const struct path *dir, struct dentry *dentry) -LSM_HOOK(int, 0, path_mkdir, const struct path *dir, struct dentry *dentry, - umode_t mode) -LSM_HOOK(int, 0, path_rmdir, const struct path *dir, struct dentry *dentry) -LSM_HOOK(int, 0, path_mknod, const struct path *dir, struct dentry *dentry, - umode_t mode, unsigned int dev) -LSM_HOOK(int, 0, path_truncate, const struct path *path) -LSM_HOOK(int, 0, path_symlink, const struct path *dir, struct dentry *dentry, - const char *old_name) -LSM_HOOK(int, 0, path_link, struct dentry *old_dentry, - const struct path *new_dir, struct dentry *new_dentry) -LSM_HOOK(int, 0, path_rename, const struct path *old_dir, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_unlink, + const struct path *dir, struct dentry *dentry) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_mkdir, const struct path *dir, + struct dentry *dentry, umode_t mode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_rmdir, const struct path *dir, + struct dentry *dentry) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_mknod, const struct path *dir, + struct dentry *dentry, umode_t mode, unsigned int dev) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_truncate, + const struct path *path) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_symlink, + const struct path *dir, struct dentry *dentry, const char *old_name) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_link, struct dentry *old_dentry, const struct path *new_dir, - struct dentry *new_dentry, unsigned int flags) -LSM_HOOK(int, 0, path_chmod, const struct path *path, umode_t mode) -LSM_HOOK(int, 0, path_chown, const struct path *path, kuid_t uid, kgid_t gid) -LSM_HOOK(int, 0, path_chroot, const struct path *path) + struct dentry *new_dentry) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_rename, + const struct path *old_dir, struct dentry *old_dentry, + const struct path *new_dir, struct dentry *new_dentry, + unsigned int flags) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_chmod, + const struct path *path, umode_t mode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_chown, + const struct path *path, kuid_t uid, kgid_t gid) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_chroot, + const struct path *path) #endif /* CONFIG_SECURITY_PATH */
/* Needed for inode based security check */ -LSM_HOOK(int, 0, path_notify, const struct path *path, u64 mask, - unsigned int obj_type) -LSM_HOOK(int, 0, inode_alloc_security, struct inode *inode) -LSM_HOOK(void, LSM_RET_VOID, inode_free_security, struct inode *inode) -LSM_HOOK(int, 0, inode_init_security, struct inode *inode, - struct inode *dir, const struct qstr *qstr, const char **name, - void **value, size_t *len) -LSM_HOOK(int, 0, inode_init_security_anon, struct inode *inode, - const struct qstr *name, const struct inode *context_inode) -LSM_HOOK(int, 0, inode_create, struct inode *dir, struct dentry *dentry, - umode_t mode) -LSM_HOOK(int, 0, inode_link, struct dentry *old_dentry, struct inode *dir, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, path_notify, + const struct path *path, u64 mask, unsigned int obj_type) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_alloc_security, + struct inode *inode) +LSM_HOOK(void, LSM_RET_VOID, 0, inode_free_security, struct inode *inode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_init_security, + struct inode *inode, struct inode *dir, const struct qstr *qstr, + const char **name, void **value, size_t *len) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_init_security_anon, + struct inode *inode, const struct qstr *name, + const struct inode *context_inode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_create, struct inode *dir, + struct dentry *dentry, umode_t mode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_link, + struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) -LSM_HOOK(int, 0, inode_unlink, struct inode *dir, struct dentry *dentry) -LSM_HOOK(int, 0, inode_symlink, struct inode *dir, struct dentry *dentry, - const char *old_name) -LSM_HOOK(int, 0, inode_mkdir, struct inode *dir, struct dentry *dentry, - umode_t mode) -LSM_HOOK(int, 0, inode_rmdir, struct inode *dir, struct dentry *dentry) -LSM_HOOK(int, 0, inode_mknod, struct inode *dir, struct dentry *dentry, - umode_t mode, dev_t dev) -LSM_HOOK(int, 0, inode_rename, struct inode *old_dir, struct dentry *old_dentry, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_unlink, struct inode *dir, + struct dentry *dentry) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_symlink, struct inode *dir, + struct dentry *dentry, const char *old_name) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_mkdir, struct inode *dir, + struct dentry *dentry, umode_t mode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_rmdir, struct inode *dir, + struct dentry *dentry) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_mknod, struct inode *dir, + struct dentry *dentry, umode_t mode, dev_t dev) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_rename, + struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) -LSM_HOOK(int, 0, inode_readlink, struct dentry *dentry) -LSM_HOOK(int, 0, inode_follow_link, struct dentry *dentry, struct inode *inode, - bool rcu) -LSM_HOOK(int, 0, inode_permission, struct inode *inode, int mask) -LSM_HOOK(int, 0, inode_setattr, struct dentry *dentry, struct iattr *attr) -LSM_HOOK(int, 0, inode_getattr, const struct path *path) -LSM_HOOK(int, 0, inode_setxattr, struct user_namespace *mnt_userns, - struct dentry *dentry, const char *name, const void *value, - size_t size, int flags) -LSM_HOOK(void, LSM_RET_VOID, inode_post_setxattr, struct dentry *dentry, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_readlink, + struct dentry *dentry) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_follow_link, + struct dentry *dentry, struct inode *inode, bool rcu) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_permission, + struct inode *inode, int mask) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_setattr, + struct dentry *dentry, struct iattr *attr) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_getattr, + const struct path *path) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_setxattr, + struct user_namespace *mnt_userns, struct dentry *dentry, + const char *name, const void *value, size_t size, int flags) +LSM_HOOK(void, LSM_RET_VOID, 0, inode_post_setxattr, struct dentry *dentry, const char *name, const void *value, size_t size, int flags) -LSM_HOOK(int, 0, inode_getxattr, struct dentry *dentry, const char *name) -LSM_HOOK(int, 0, inode_listxattr, struct dentry *dentry) -LSM_HOOK(int, 0, inode_removexattr, struct user_namespace *mnt_userns, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_getxattr, struct dentry *dentry, const char *name) -LSM_HOOK(int, 0, inode_need_killpriv, struct dentry *dentry) -LSM_HOOK(int, 0, inode_killpriv, struct user_namespace *mnt_userns, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_listxattr, struct dentry *dentry) -LSM_HOOK(int, -EOPNOTSUPP, inode_getsecurity, struct user_namespace *mnt_userns, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_removexattr, + struct user_namespace *mnt_userns, struct dentry *dentry, + const char *name) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO | LSM_RET_ONE | LSM_RET_GT_ONE, + inode_need_killpriv, struct dentry *dentry) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_killpriv, + struct user_namespace *mnt_userns, struct dentry *dentry) +LSM_HOOK(int, -EOPNOTSUPP, + LSM_RET_NEG | LSM_RET_ZERO | LSM_RET_ONE | LSM_RET_GT_ONE, + inode_getsecurity, struct user_namespace *mnt_userns, struct inode *inode, const char *name, void **buffer, bool alloc) -LSM_HOOK(int, -EOPNOTSUPP, inode_setsecurity, struct inode *inode, - const char *name, const void *value, size_t size, int flags) -LSM_HOOK(int, 0, inode_listsecurity, struct inode *inode, char *buffer, +LSM_HOOK(int, -EOPNOTSUPP, LSM_RET_NEG | LSM_RET_ZERO, inode_setsecurity, + struct inode *inode, const char *name, const void *value, size_t size, + int flags) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO | LSM_RET_ONE | LSM_RET_GT_ONE, + inode_listsecurity, struct inode *inode, char *buffer, size_t buffer_size) -LSM_HOOK(void, LSM_RET_VOID, inode_getsecid, struct inode *inode, u32 *secid) -LSM_HOOK(int, 0, inode_copy_up, struct dentry *src, struct cred **new) -LSM_HOOK(int, -EOPNOTSUPP, inode_copy_up_xattr, const char *name) -LSM_HOOK(int, 0, kernfs_init_security, struct kernfs_node *kn_dir, - struct kernfs_node *kn) -LSM_HOOK(int, 0, file_permission, struct file *file, int mask) -LSM_HOOK(int, 0, file_alloc_security, struct file *file) -LSM_HOOK(void, LSM_RET_VOID, file_free_security, struct file *file) -LSM_HOOK(int, 0, file_ioctl, struct file *file, unsigned int cmd, - unsigned long arg) -LSM_HOOK(int, 0, mmap_addr, unsigned long addr) -LSM_HOOK(int, 0, mmap_file, struct file *file, unsigned long reqprot, - unsigned long prot, unsigned long flags) -LSM_HOOK(int, 0, file_mprotect, struct vm_area_struct *vma, - unsigned long reqprot, unsigned long prot) -LSM_HOOK(int, 0, file_lock, struct file *file, unsigned int cmd) -LSM_HOOK(int, 0, file_fcntl, struct file *file, unsigned int cmd, - unsigned long arg) -LSM_HOOK(void, LSM_RET_VOID, file_set_fowner, struct file *file) -LSM_HOOK(int, 0, file_send_sigiotask, struct task_struct *tsk, - struct fown_struct *fown, int sig) -LSM_HOOK(int, 0, file_receive, struct file *file) -LSM_HOOK(int, 0, file_open, struct file *file) -LSM_HOOK(int, 0, task_alloc, struct task_struct *task, - unsigned long clone_flags) -LSM_HOOK(void, LSM_RET_VOID, task_free, struct task_struct *task) -LSM_HOOK(int, 0, cred_alloc_blank, struct cred *cred, gfp_t gfp) -LSM_HOOK(void, LSM_RET_VOID, cred_free, struct cred *cred) -LSM_HOOK(int, 0, cred_prepare, struct cred *new, const struct cred *old, - gfp_t gfp) -LSM_HOOK(void, LSM_RET_VOID, cred_transfer, struct cred *new, +LSM_HOOK(void, LSM_RET_VOID, 0, inode_getsecid, struct inode *inode, u32 *secid) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_copy_up, struct dentry *src, + struct cred **new) +LSM_HOOK(int, -EOPNOTSUPP, LSM_RET_NEG | LSM_RET_ZERO | LSM_RET_ONE, + inode_copy_up_xattr, const char *name) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, kernfs_init_security, + struct kernfs_node *kn_dir, struct kernfs_node *kn) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, file_permission, struct file *file, + int mask) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, file_alloc_security, + struct file *file) +LSM_HOOK(void, LSM_RET_VOID, 0, file_free_security, struct file *file) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, file_ioctl, struct file *file, + unsigned int cmd, unsigned long arg) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, mmap_addr, unsigned long addr) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, mmap_file, struct file *file, + unsigned long reqprot, unsigned long prot, unsigned long flags) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, file_mprotect, + struct vm_area_struct *vma, unsigned long reqprot, unsigned long prot) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, file_lock, struct file *file, + unsigned int cmd) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, file_fcntl, struct file *file, + unsigned int cmd, unsigned long arg) +LSM_HOOK(void, LSM_RET_VOID, 0, file_set_fowner, struct file *file) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, file_send_sigiotask, + struct task_struct *tsk, struct fown_struct *fown, int sig) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, file_receive, struct file *file) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, file_open, struct file *file) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_alloc, + struct task_struct *task, unsigned long clone_flags) +LSM_HOOK(void, LSM_RET_VOID, 0, task_free, struct task_struct *task) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, cred_alloc_blank, + struct cred *cred, gfp_t gfp) +LSM_HOOK(void, LSM_RET_VOID, 0, cred_free, struct cred *cred) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, cred_prepare, struct cred *new, + const struct cred *old, gfp_t gfp) +LSM_HOOK(void, LSM_RET_VOID, 0, cred_transfer, struct cred *new, const struct cred *old) -LSM_HOOK(void, LSM_RET_VOID, cred_getsecid, const struct cred *c, u32 *secid) -LSM_HOOK(int, 0, kernel_act_as, struct cred *new, u32 secid) -LSM_HOOK(int, 0, kernel_create_files_as, struct cred *new, struct inode *inode) -LSM_HOOK(int, 0, kernel_module_request, char *kmod_name) -LSM_HOOK(int, 0, kernel_load_data, enum kernel_load_data_id id, bool contents) -LSM_HOOK(int, 0, kernel_post_load_data, char *buf, loff_t size, - enum kernel_load_data_id id, char *description) -LSM_HOOK(int, 0, kernel_read_file, struct file *file, - enum kernel_read_file_id id, bool contents) -LSM_HOOK(int, 0, kernel_post_read_file, struct file *file, char *buf, - loff_t size, enum kernel_read_file_id id) -LSM_HOOK(int, 0, task_fix_setuid, struct cred *new, const struct cred *old, - int flags) -LSM_HOOK(int, 0, task_fix_setgid, struct cred *new, const struct cred * old, - int flags) -LSM_HOOK(int, 0, task_fix_setgroups, struct cred *new, const struct cred * old) -LSM_HOOK(int, 0, task_setpgid, struct task_struct *p, pid_t pgid) -LSM_HOOK(int, 0, task_getpgid, struct task_struct *p) -LSM_HOOK(int, 0, task_getsid, struct task_struct *p) -LSM_HOOK(void, LSM_RET_VOID, current_getsecid_subj, u32 *secid) -LSM_HOOK(void, LSM_RET_VOID, task_getsecid_obj, +LSM_HOOK(void, LSM_RET_VOID, 0, cred_getsecid, const struct cred *c, u32 *secid) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, kernel_act_as, struct cred *new, + u32 secid) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, kernel_create_files_as, + struct cred *new, struct inode *inode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, kernel_module_request, + char *kmod_name) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, kernel_load_data, + enum kernel_load_data_id id, bool contents) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, kernel_post_load_data, char *buf, + loff_t size, enum kernel_load_data_id id, char *description) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, kernel_read_file, + struct file *file, enum kernel_read_file_id id, bool contents) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, kernel_post_read_file, + struct file *file, char *buf, loff_t size, enum kernel_read_file_id id) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_fix_setuid, struct cred *new, + const struct cred *old, int flags) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_fix_setgid, struct cred *new, + const struct cred *old, int flags) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_fix_setgroups, + struct cred *new, const struct cred *old) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_setpgid, + struct task_struct *p, pid_t pgid) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_getpgid, + struct task_struct *p) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_getsid, struct task_struct *p) +LSM_HOOK(void, LSM_RET_VOID, 0, current_getsecid_subj, u32 *secid) +LSM_HOOK(void, LSM_RET_VOID, 0, task_getsecid_obj, struct task_struct *p, u32 *secid) -LSM_HOOK(int, 0, task_setnice, struct task_struct *p, int nice) -LSM_HOOK(int, 0, task_setioprio, struct task_struct *p, int ioprio) -LSM_HOOK(int, 0, task_getioprio, struct task_struct *p) -LSM_HOOK(int, 0, task_prlimit, const struct cred *cred, - const struct cred *tcred, unsigned int flags) -LSM_HOOK(int, 0, task_setrlimit, struct task_struct *p, unsigned int resource, - struct rlimit *new_rlim) -LSM_HOOK(int, 0, task_setscheduler, struct task_struct *p) -LSM_HOOK(int, 0, task_getscheduler, struct task_struct *p) -LSM_HOOK(int, 0, task_movememory, struct task_struct *p) -LSM_HOOK(int, 0, task_kill, struct task_struct *p, struct kernel_siginfo *info, - int sig, const struct cred *cred) -LSM_HOOK(int, -ENOSYS, task_prctl, int option, unsigned long arg2, - unsigned long arg3, unsigned long arg4, unsigned long arg5) -LSM_HOOK(void, LSM_RET_VOID, task_to_inode, struct task_struct *p, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_setnice, + struct task_struct *p, int nice) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_setioprio, + struct task_struct *p, int ioprio) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_getioprio, + struct task_struct *p) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_prlimit, + const struct cred *cred, const struct cred *tcred, unsigned int flags) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_setrlimit, + struct task_struct *p, unsigned int resource, struct rlimit *new_rlim) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_setscheduler, + struct task_struct *p) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_getscheduler, + struct task_struct *p) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_movememory, + struct task_struct *p) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, task_kill, struct task_struct *p, + struct kernel_siginfo *info, int sig, const struct cred *cred) +LSM_HOOK(int, -ENOSYS, + LSM_RET_NEG | LSM_RET_ZERO | LSM_RET_ONE | LSM_RET_GT_ONE, task_prctl, + int option, unsigned long arg2, unsigned long arg3, unsigned long arg4, + unsigned long arg5) +LSM_HOOK(void, LSM_RET_VOID, 0, task_to_inode, struct task_struct *p, struct inode *inode) -LSM_HOOK(int, 0, userns_create, const struct cred *cred) -LSM_HOOK(int, 0, ipc_permission, struct kern_ipc_perm *ipcp, short flag) -LSM_HOOK(void, LSM_RET_VOID, ipc_getsecid, struct kern_ipc_perm *ipcp, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, userns_create, + const struct cred *cred) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, ipc_permission, + struct kern_ipc_perm *ipcp, short flag) +LSM_HOOK(void, LSM_RET_VOID, 0, ipc_getsecid, struct kern_ipc_perm *ipcp, u32 *secid) -LSM_HOOK(int, 0, msg_msg_alloc_security, struct msg_msg *msg) -LSM_HOOK(void, LSM_RET_VOID, msg_msg_free_security, struct msg_msg *msg) -LSM_HOOK(int, 0, msg_queue_alloc_security, struct kern_ipc_perm *perm) -LSM_HOOK(void, LSM_RET_VOID, msg_queue_free_security, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, msg_msg_alloc_security, + struct msg_msg *msg) +LSM_HOOK(void, LSM_RET_VOID, 0, msg_msg_free_security, struct msg_msg *msg) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, msg_queue_alloc_security, + struct kern_ipc_perm *perm) +LSM_HOOK(void, LSM_RET_VOID, 0, msg_queue_free_security, + struct kern_ipc_perm *perm) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, msg_queue_associate, + struct kern_ipc_perm *perm, int msqflg) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, msg_queue_msgctl, + struct kern_ipc_perm *perm, int cmd) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, msg_queue_msgsnd, + struct kern_ipc_perm *perm, struct msg_msg *msg, int msqflg) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, msg_queue_msgrcv, + struct kern_ipc_perm *perm, struct msg_msg *msg, + struct task_struct *target, long type, int mode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, shm_alloc_security, struct kern_ipc_perm *perm) -LSM_HOOK(int, 0, msg_queue_associate, struct kern_ipc_perm *perm, int msqflg) -LSM_HOOK(int, 0, msg_queue_msgctl, struct kern_ipc_perm *perm, int cmd) -LSM_HOOK(int, 0, msg_queue_msgsnd, struct kern_ipc_perm *perm, - struct msg_msg *msg, int msqflg) -LSM_HOOK(int, 0, msg_queue_msgrcv, struct kern_ipc_perm *perm, - struct msg_msg *msg, struct task_struct *target, long type, int mode) -LSM_HOOK(int, 0, shm_alloc_security, struct kern_ipc_perm *perm) -LSM_HOOK(void, LSM_RET_VOID, shm_free_security, struct kern_ipc_perm *perm) -LSM_HOOK(int, 0, shm_associate, struct kern_ipc_perm *perm, int shmflg) -LSM_HOOK(int, 0, shm_shmctl, struct kern_ipc_perm *perm, int cmd) -LSM_HOOK(int, 0, shm_shmat, struct kern_ipc_perm *perm, char __user *shmaddr, - int shmflg) -LSM_HOOK(int, 0, sem_alloc_security, struct kern_ipc_perm *perm) -LSM_HOOK(void, LSM_RET_VOID, sem_free_security, struct kern_ipc_perm *perm) -LSM_HOOK(int, 0, sem_associate, struct kern_ipc_perm *perm, int semflg) -LSM_HOOK(int, 0, sem_semctl, struct kern_ipc_perm *perm, int cmd) -LSM_HOOK(int, 0, sem_semop, struct kern_ipc_perm *perm, struct sembuf *sops, - unsigned nsops, int alter) -LSM_HOOK(int, 0, netlink_send, struct sock *sk, struct sk_buff *skb) -LSM_HOOK(void, LSM_RET_VOID, d_instantiate, struct dentry *dentry, +LSM_HOOK(void, LSM_RET_VOID, 0, shm_free_security, struct kern_ipc_perm *perm) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, shm_associate, + struct kern_ipc_perm *perm, int shmflg) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, shm_shmctl, + struct kern_ipc_perm *perm, int cmd) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, shm_shmat, + struct kern_ipc_perm *perm, char __user *shmaddr, int shmflg) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sem_alloc_security, + struct kern_ipc_perm *perm) +LSM_HOOK(void, LSM_RET_VOID, 0, sem_free_security, struct kern_ipc_perm *perm) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sem_associate, + struct kern_ipc_perm *perm, int semflg) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sem_semctl, + struct kern_ipc_perm *perm, int cmd) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sem_semop, + struct kern_ipc_perm *perm, struct sembuf *sops, unsigned nsops, + int alter) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, netlink_send, struct sock *sk, + struct sk_buff *skb) +LSM_HOOK(void, LSM_RET_VOID, 0, d_instantiate, struct dentry *dentry, struct inode *inode) -LSM_HOOK(int, -EINVAL, getprocattr, struct task_struct *p, const char *name, - char **value) -LSM_HOOK(int, -EINVAL, setprocattr, const char *name, void *value, size_t size) -LSM_HOOK(int, 0, ismaclabel, const char *name) -LSM_HOOK(int, -EOPNOTSUPP, secid_to_secctx, u32 secid, char **secdata, - u32 *seclen) -LSM_HOOK(int, 0, secctx_to_secid, const char *secdata, u32 seclen, u32 *secid) -LSM_HOOK(void, LSM_RET_VOID, release_secctx, char *secdata, u32 seclen) -LSM_HOOK(void, LSM_RET_VOID, inode_invalidate_secctx, struct inode *inode) -LSM_HOOK(int, 0, inode_notifysecctx, struct inode *inode, void *ctx, u32 ctxlen) -LSM_HOOK(int, 0, inode_setsecctx, struct dentry *dentry, void *ctx, u32 ctxlen) -LSM_HOOK(int, 0, inode_getsecctx, struct inode *inode, void **ctx, - u32 *ctxlen) +LSM_HOOK(int, -EINVAL, + LSM_RET_NEG | LSM_RET_ZERO | LSM_RET_ONE | LSM_RET_GT_ONE, getprocattr, + struct task_struct *p, const char *name, char **value) +LSM_HOOK(int, -EINVAL, + LSM_RET_NEG | LSM_RET_ZERO | LSM_RET_ONE | LSM_RET_GT_ONE, setprocattr, + const char *name, void *value, size_t size) +LSM_HOOK(int, 0, LSM_RET_ZERO | LSM_RET_ONE, ismaclabel, const char *name) +LSM_HOOK(int, -EOPNOTSUPP, LSM_RET_NEG | LSM_RET_ZERO, secid_to_secctx, + u32 secid, char **secdata, u32 *seclen) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, secctx_to_secid, + const char *secdata, u32 seclen, u32 *secid) +LSM_HOOK(void, LSM_RET_VOID, 0, release_secctx, char *secdata, u32 seclen) +LSM_HOOK(void, LSM_RET_VOID, 0, inode_invalidate_secctx, struct inode *inode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_notifysecctx, + struct inode *inode, void *ctx, u32 ctxlen) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_setsecctx, + struct dentry *dentry, void *ctx, u32 ctxlen) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inode_getsecctx, + struct inode *inode, void **ctx, u32 *ctxlen)
#if defined(CONFIG_SECURITY) && defined(CONFIG_WATCH_QUEUE) -LSM_HOOK(int, 0, post_notification, const struct cred *w_cred, - const struct cred *cred, struct watch_notification *n) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, post_notification, + const struct cred *w_cred, const struct cred *cred, + struct watch_notification *n) #endif /* CONFIG_SECURITY && CONFIG_WATCH_QUEUE */
#if defined(CONFIG_SECURITY) && defined(CONFIG_KEY_NOTIFICATIONS) -LSM_HOOK(int, 0, watch_key, struct key *key) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, watch_key, struct key *key) #endif /* CONFIG_SECURITY && CONFIG_KEY_NOTIFICATIONS */
#ifdef CONFIG_SECURITY_NETWORK -LSM_HOOK(int, 0, unix_stream_connect, struct sock *sock, struct sock *other, - struct sock *newsk) -LSM_HOOK(int, 0, unix_may_send, struct socket *sock, struct socket *other) -LSM_HOOK(int, 0, socket_create, int family, int type, int protocol, int kern) -LSM_HOOK(int, 0, socket_post_create, struct socket *sock, int family, int type, - int protocol, int kern) -LSM_HOOK(int, 0, socket_socketpair, struct socket *socka, struct socket *sockb) -LSM_HOOK(int, 0, socket_bind, struct socket *sock, struct sockaddr *address, - int addrlen) -LSM_HOOK(int, 0, socket_connect, struct socket *sock, struct sockaddr *address, - int addrlen) -LSM_HOOK(int, 0, socket_listen, struct socket *sock, int backlog) -LSM_HOOK(int, 0, socket_accept, struct socket *sock, struct socket *newsock) -LSM_HOOK(int, 0, socket_sendmsg, struct socket *sock, struct msghdr *msg, - int size) -LSM_HOOK(int, 0, socket_recvmsg, struct socket *sock, struct msghdr *msg, - int size, int flags) -LSM_HOOK(int, 0, socket_getsockname, struct socket *sock) -LSM_HOOK(int, 0, socket_getpeername, struct socket *sock) -LSM_HOOK(int, 0, socket_getsockopt, struct socket *sock, int level, int optname) -LSM_HOOK(int, 0, socket_setsockopt, struct socket *sock, int level, int optname) -LSM_HOOK(int, 0, socket_shutdown, struct socket *sock, int how) -LSM_HOOK(int, 0, socket_sock_rcv_skb, struct sock *sk, struct sk_buff *skb) -LSM_HOOK(int, 0, socket_getpeersec_stream, struct socket *sock, - char __user *optval, int __user *optlen, unsigned len) -LSM_HOOK(int, 0, socket_getpeersec_dgram, struct socket *sock, - struct sk_buff *skb, u32 *secid) -LSM_HOOK(int, 0, sk_alloc_security, struct sock *sk, int family, gfp_t priority) -LSM_HOOK(void, LSM_RET_VOID, sk_free_security, struct sock *sk) -LSM_HOOK(void, LSM_RET_VOID, sk_clone_security, const struct sock *sk, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, unix_stream_connect, + struct sock *sock, struct sock *other, struct sock *newsk) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, unix_may_send, struct socket *sock, + struct socket *other) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_create, int family, + int type, int protocol, int kern) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_post_create, + struct socket *sock, int family, int type, int protocol, int kern) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_socketpair, + struct socket *socka, struct socket *sockb) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_bind, struct socket *sock, + struct sockaddr *address, int addrlen) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_connect, + struct socket *sock, struct sockaddr *address, int addrlen) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_listen, struct socket *sock, + int backlog) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_accept, struct socket *sock, + struct socket *newsock) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_sendmsg, + struct socket *sock, struct msghdr *msg, int size) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_recvmsg, + struct socket *sock, struct msghdr *msg, int size, int flags) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_getsockname, + struct socket *sock) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_getpeername, + struct socket *sock) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_getsockopt, + struct socket *sock, int level, int optname) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_setsockopt, + struct socket *sock, int level, int optname) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_shutdown, + struct socket *sock, int how) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_sock_rcv_skb, + struct sock *sk, struct sk_buff *skb) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_getpeersec_stream, + struct socket *sock, char __user *optval, int __user *optlen, + unsigned len) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, socket_getpeersec_dgram, + struct socket *sock, struct sk_buff *skb, u32 *secid) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sk_alloc_security, struct sock *sk, + int family, gfp_t priority) +LSM_HOOK(void, LSM_RET_VOID, 0, sk_free_security, struct sock *sk) +LSM_HOOK(void, LSM_RET_VOID, 0, sk_clone_security, const struct sock *sk, struct sock *newsk) -LSM_HOOK(void, LSM_RET_VOID, sk_getsecid, struct sock *sk, u32 *secid) -LSM_HOOK(void, LSM_RET_VOID, sock_graft, struct sock *sk, struct socket *parent) -LSM_HOOK(int, 0, inet_conn_request, const struct sock *sk, struct sk_buff *skb, - struct request_sock *req) -LSM_HOOK(void, LSM_RET_VOID, inet_csk_clone, struct sock *newsk, +LSM_HOOK(void, LSM_RET_VOID, 0, sk_getsecid, struct sock *sk, u32 *secid) +LSM_HOOK(void, LSM_RET_VOID, 0, sock_graft, struct sock *sk, struct socket *parent) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, inet_conn_request, + const struct sock *sk, struct sk_buff *skb, struct request_sock *req) +LSM_HOOK(void, LSM_RET_VOID, 0, inet_csk_clone, struct sock *newsk, const struct request_sock *req) -LSM_HOOK(void, LSM_RET_VOID, inet_conn_established, struct sock *sk, +LSM_HOOK(void, LSM_RET_VOID, 0, inet_conn_established, struct sock *sk, struct sk_buff *skb) -LSM_HOOK(int, 0, secmark_relabel_packet, u32 secid) -LSM_HOOK(void, LSM_RET_VOID, secmark_refcount_inc, void) -LSM_HOOK(void, LSM_RET_VOID, secmark_refcount_dec, void) -LSM_HOOK(void, LSM_RET_VOID, req_classify_flow, const struct request_sock *req, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, secmark_relabel_packet, u32 secid) +LSM_HOOK(void, LSM_RET_VOID, 0, secmark_refcount_inc, void) +LSM_HOOK(void, LSM_RET_VOID, 0, secmark_refcount_dec, void) +LSM_HOOK(void, LSM_RET_VOID, 0, req_classify_flow, const struct request_sock *req, struct flowi_common *flic) -LSM_HOOK(int, 0, tun_dev_alloc_security, void **security) -LSM_HOOK(void, LSM_RET_VOID, tun_dev_free_security, void *security) -LSM_HOOK(int, 0, tun_dev_create, void) -LSM_HOOK(int, 0, tun_dev_attach_queue, void *security) -LSM_HOOK(int, 0, tun_dev_attach, struct sock *sk, void *security) -LSM_HOOK(int, 0, tun_dev_open, void *security) -LSM_HOOK(int, 0, sctp_assoc_request, struct sctp_association *asoc, - struct sk_buff *skb) -LSM_HOOK(int, 0, sctp_bind_connect, struct sock *sk, int optname, - struct sockaddr *address, int addrlen) -LSM_HOOK(void, LSM_RET_VOID, sctp_sk_clone, struct sctp_association *asoc, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, tun_dev_alloc_security, + void **security) +LSM_HOOK(void, LSM_RET_VOID, 0, tun_dev_free_security, void *security) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, tun_dev_create, void) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, tun_dev_attach_queue, + void *security) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, tun_dev_attach, struct sock *sk, + void *security) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, tun_dev_open, void *security) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sctp_assoc_request, + struct sctp_association *asoc, struct sk_buff *skb) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sctp_bind_connect, struct sock *sk, + int optname, struct sockaddr *address, int addrlen) +LSM_HOOK(void, LSM_RET_VOID, 0, sctp_sk_clone, struct sctp_association *asoc, struct sock *sk, struct sock *newsk) -LSM_HOOK(int, 0, sctp_assoc_established, struct sctp_association *asoc, - struct sk_buff *skb) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, sctp_assoc_established, + struct sctp_association *asoc, struct sk_buff *skb) #endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_INFINIBAND -LSM_HOOK(int, 0, ib_pkey_access, void *sec, u64 subnet_prefix, u16 pkey) -LSM_HOOK(int, 0, ib_endport_manage_subnet, void *sec, const char *dev_name, - u8 port_num) -LSM_HOOK(int, 0, ib_alloc_security, void **sec) -LSM_HOOK(void, LSM_RET_VOID, ib_free_security, void *sec) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, ib_pkey_access, void *sec, + u64 subnet_prefix, u16 pkey) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, ib_endport_manage_subnet, + void *sec, const char *dev_name, u8 port_num) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, ib_alloc_security, void **sec) +LSM_HOOK(void, LSM_RET_VOID, 0, ib_free_security, void *sec) #endif /* CONFIG_SECURITY_INFINIBAND */
#ifdef CONFIG_SECURITY_NETWORK_XFRM -LSM_HOOK(int, 0, xfrm_policy_alloc_security, struct xfrm_sec_ctx **ctxp, - struct xfrm_user_sec_ctx *sec_ctx, gfp_t gfp) -LSM_HOOK(int, 0, xfrm_policy_clone_security, struct xfrm_sec_ctx *old_ctx, - struct xfrm_sec_ctx **new_ctx) -LSM_HOOK(void, LSM_RET_VOID, xfrm_policy_free_security, +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, xfrm_policy_alloc_security, + struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx, + gfp_t gfp) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, xfrm_policy_clone_security, + struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx) +LSM_HOOK(void, LSM_RET_VOID, 0, xfrm_policy_free_security, + struct xfrm_sec_ctx *ctx) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, xfrm_policy_delete_security, struct xfrm_sec_ctx *ctx) -LSM_HOOK(int, 0, xfrm_policy_delete_security, struct xfrm_sec_ctx *ctx) -LSM_HOOK(int, 0, xfrm_state_alloc, struct xfrm_state *x, - struct xfrm_user_sec_ctx *sec_ctx) -LSM_HOOK(int, 0, xfrm_state_alloc_acquire, struct xfrm_state *x, - struct xfrm_sec_ctx *polsec, u32 secid) -LSM_HOOK(void, LSM_RET_VOID, xfrm_state_free_security, struct xfrm_state *x) -LSM_HOOK(int, 0, xfrm_state_delete_security, struct xfrm_state *x) -LSM_HOOK(int, 0, xfrm_policy_lookup, struct xfrm_sec_ctx *ctx, u32 fl_secid) -LSM_HOOK(int, 1, xfrm_state_pol_flow_match, struct xfrm_state *x, - struct xfrm_policy *xp, const struct flowi_common *flic) -LSM_HOOK(int, 0, xfrm_decode_session, struct sk_buff *skb, u32 *secid, - int ckall) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, xfrm_state_alloc, + struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, xfrm_state_alloc_acquire, + struct xfrm_state *x, struct xfrm_sec_ctx *polsec, u32 secid) +LSM_HOOK(void, LSM_RET_VOID, 0, xfrm_state_free_security, struct xfrm_state *x) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, xfrm_state_delete_security, + struct xfrm_state *x) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, xfrm_policy_lookup, + struct xfrm_sec_ctx *ctx, u32 fl_secid) +LSM_HOOK(int, 1, LSM_RET_ZERO | LSM_RET_ONE, xfrm_state_pol_flow_match, + struct xfrm_state *x, struct xfrm_policy *xp, + const struct flowi_common *flic) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, xfrm_decode_session, + struct sk_buff *skb, u32 *secid, int ckall) #endif /* CONFIG_SECURITY_NETWORK_XFRM */
/* key management security hooks */ #ifdef CONFIG_KEYS -LSM_HOOK(int, 0, key_alloc, struct key *key, const struct cred *cred, - unsigned long flags) -LSM_HOOK(void, LSM_RET_VOID, key_free, struct key *key) -LSM_HOOK(int, 0, key_permission, key_ref_t key_ref, const struct cred *cred, - enum key_need_perm need_perm) -LSM_HOOK(int, 0, key_getsecurity, struct key *key, char **_buffer) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, key_alloc, struct key *key, + const struct cred *cred, unsigned long flags) +LSM_HOOK(void, LSM_RET_VOID, 0, key_free, struct key *key) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, key_permission, key_ref_t key_ref, + const struct cred *cred, enum key_need_perm need_perm) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO | LSM_RET_ONE | LSM_RET_GT_ONE, + key_getsecurity, struct key *key, char **_buffer) #endif /* CONFIG_KEYS */
#ifdef CONFIG_AUDIT -LSM_HOOK(int, 0, audit_rule_init, u32 field, u32 op, char *rulestr, - void **lsmrule) -LSM_HOOK(int, 0, audit_rule_known, struct audit_krule *krule) -LSM_HOOK(int, 0, audit_rule_match, u32 secid, u32 field, u32 op, void *lsmrule) -LSM_HOOK(void, LSM_RET_VOID, audit_rule_free, void *lsmrule) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, audit_rule_init, u32 field, u32 op, + char *rulestr, void **lsmrule) +LSM_HOOK(int, 0, LSM_RET_ZERO | LSM_RET_ONE, audit_rule_known, + struct audit_krule *krule) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO | LSM_RET_ONE, audit_rule_match, + u32 secid, u32 field, u32 op, void *lsmrule) +LSM_HOOK(void, LSM_RET_VOID, 0, audit_rule_free, void *lsmrule) #endif /* CONFIG_AUDIT */
#ifdef CONFIG_BPF_SYSCALL -LSM_HOOK(int, 0, bpf, int cmd, union bpf_attr *attr, unsigned int size) -LSM_HOOK(int, 0, bpf_map, struct bpf_map *map, fmode_t fmode) -LSM_HOOK(int, 0, bpf_prog, struct bpf_prog *prog) -LSM_HOOK(int, 0, bpf_map_alloc_security, struct bpf_map *map) -LSM_HOOK(void, LSM_RET_VOID, bpf_map_free_security, struct bpf_map *map) -LSM_HOOK(int, 0, bpf_prog_alloc_security, struct bpf_prog_aux *aux) -LSM_HOOK(void, LSM_RET_VOID, bpf_prog_free_security, struct bpf_prog_aux *aux) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, bpf, int cmd, union bpf_attr *attr, + unsigned int size) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, bpf_map, struct bpf_map *map, + fmode_t fmode) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, bpf_prog, struct bpf_prog *prog) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, bpf_map_alloc_security, + struct bpf_map *map) +LSM_HOOK(void, LSM_RET_VOID, 0, bpf_map_free_security, struct bpf_map *map) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, bpf_prog_alloc_security, + struct bpf_prog_aux *aux) +LSM_HOOK(void, LSM_RET_VOID, 0, bpf_prog_free_security, struct bpf_prog_aux *aux) #endif /* CONFIG_BPF_SYSCALL */
-LSM_HOOK(int, 0, locked_down, enum lockdown_reason what) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, locked_down, + enum lockdown_reason what)
#ifdef CONFIG_PERF_EVENTS -LSM_HOOK(int, 0, perf_event_open, struct perf_event_attr *attr, int type) -LSM_HOOK(int, 0, perf_event_alloc, struct perf_event *event) -LSM_HOOK(void, LSM_RET_VOID, perf_event_free, struct perf_event *event) -LSM_HOOK(int, 0, perf_event_read, struct perf_event *event) -LSM_HOOK(int, 0, perf_event_write, struct perf_event *event) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, perf_event_open, + struct perf_event_attr *attr, int type) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, perf_event_alloc, + struct perf_event *event) +LSM_HOOK(void, LSM_RET_VOID, 0, perf_event_free, struct perf_event *event) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, perf_event_read, + struct perf_event *event) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, perf_event_write, + struct perf_event *event) #endif /* CONFIG_PERF_EVENTS */
#ifdef CONFIG_IO_URING -LSM_HOOK(int, 0, uring_override_creds, const struct cred *new) -LSM_HOOK(int, 0, uring_sqpoll, void) -LSM_HOOK(int, 0, uring_cmd, struct io_uring_cmd *ioucmd) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, uring_override_creds, + const struct cred *new) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, uring_sqpoll, void) +LSM_HOOK(int, 0, LSM_RET_NEG | LSM_RET_ZERO, uring_cmd, + struct io_uring_cmd *ioucmd) #endif /* CONFIG_IO_URING */ diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index c0c570b7eabd..1911675a0da0 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -1642,13 +1642,13 @@ * */ union security_list_options { - #define LSM_HOOK(RET, DEFAULT, NAME, ...) RET (*NAME)(__VA_ARGS__); + #define LSM_HOOK(RET, DEFAULT, RET_FLAGS, NAME, ...) RET (*NAME)(__VA_ARGS__); #include "lsm_hook_defs.h" #undef LSM_HOOK };
struct security_hook_heads { - #define LSM_HOOK(RET, DEFAULT, NAME, ...) struct hlist_head NAME; + #define LSM_HOOK(RET, DEFAULT, RET_FLAGS, NAME, ...) struct hlist_head NAME; #include "lsm_hook_defs.h" #undef LSM_HOOK } __randomize_layout; @@ -1683,6 +1683,11 @@ struct lsm_blob_sizes { */ #define LSM_RET_VOID ((void) 0)
+#define LSM_RET_NEG 0x00000001 +#define LSM_RET_ZERO 0x00000002 +#define LSM_RET_ONE 0x00000004 +#define LSM_RET_GT_ONE 0x00000008 + /* * Initializing a security_hook_list structure takes * up a lot of space in a source file. This macro takes diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c index d6c9b3705f24..37bcedf5a44e 100644 --- a/kernel/bpf/bpf_lsm.c +++ b/kernel/bpf/bpf_lsm.c @@ -21,7 +21,7 @@ /* For every LSM hook that allows attachment of BPF programs, declare a nop * function where a BPF program can be attached. */ -#define LSM_HOOK(RET, DEFAULT, NAME, ...) \ +#define LSM_HOOK(RET, DEFAULT, RET_FLAGS, NAME, ...) \ noinline RET bpf_lsm_##NAME(__VA_ARGS__) \ { \ return DEFAULT; \ @@ -30,7 +30,8 @@ noinline RET bpf_lsm_##NAME(__VA_ARGS__) \ #include <linux/lsm_hook_defs.h> #undef LSM_HOOK
-#define LSM_HOOK(RET, DEFAULT, NAME, ...) BTF_ID(func, bpf_lsm_##NAME) +#define LSM_HOOK(RET, DEFAULT, RET_FLAGS, NAME, ...) \ + BTF_ID(func, bpf_lsm_##NAME) BTF_SET_START(bpf_lsm_hooks) #include <linux/lsm_hook_defs.h> #undef LSM_HOOK diff --git a/security/bpf/hooks.c b/security/bpf/hooks.c index e5971fa74fd7..a2a3b2be345f 100644 --- a/security/bpf/hooks.c +++ b/security/bpf/hooks.c @@ -7,7 +7,7 @@ #include <linux/bpf_lsm.h>
static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = { - #define LSM_HOOK(RET, DEFAULT, NAME, ...) \ + #define LSM_HOOK(RET, DEFAULT, RET_FLAGS, NAME, ...) \ LSM_HOOK_INIT(NAME, bpf_lsm_##NAME), #include <linux/lsm_hook_defs.h> #undef LSM_HOOK diff --git a/security/security.c b/security/security.c index 79d82cb6e469..4041d24e3283 100644 --- a/security/security.c +++ b/security/security.c @@ -371,7 +371,7 @@ int __init early_security_init(void) { struct lsm_info *lsm;
-#define LSM_HOOK(RET, DEFAULT, NAME, ...) \ +#define LSM_HOOK(RET, DEFAULT, RET_FLAGS, NAME, ...) \ INIT_HLIST_HEAD(&security_hook_heads.NAME); #include "linux/lsm_hook_defs.h" #undef LSM_HOOK @@ -710,7 +710,7 @@ static int lsm_superblock_alloc(struct super_block *sb) #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME) #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \ static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT); -#define LSM_HOOK(RET, DEFAULT, NAME, ...) \ +#define LSM_HOOK(RET, DEFAULT, RET_FLAGS, NAME, ...) \ DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
#include <linux/lsm_hook_defs.h>
On Tue, Nov 15, 2022 at 12:58 PM Roberto Sassu roberto.sassu@huaweicloud.com wrote:
From: Roberto Sassu roberto.sassu@huawei.com
Define four return value flags (LSM_RET_NEG, LSM_RET_ZERO, LSM_RET_ONE, LSM_RET_GT_ONE), one for each interval of interest (< 0, = 0, = 1, > 1).
Redefine the LSM_HOOK() macro to add return value flags as argument, and set the correct flags for each LSM hook.
Implementors of new LSM hooks should do the same as well.
Cc: stable@vger.kernel.org # 5.7.x Fixes: 9d3fdea789c8 ("bpf: lsm: Provide attachment points for BPF LSM programs") Signed-off-by: Roberto Sassu roberto.sassu@huawei.com
include/linux/bpf_lsm.h | 2 +- include/linux/lsm_hook_defs.h | 779 ++++++++++++++++++++-------------- include/linux/lsm_hooks.h | 9 +- kernel/bpf/bpf_lsm.c | 5 +- security/bpf/hooks.c | 2 +- security/security.c | 4 +- 6 files changed, 466 insertions(+), 335 deletions(-)
Just a quick note here that even if we wanted to do something like this, it is absolutely not -stable kernel material. No way.
On Tue, 2022-11-15 at 21:27 -0500, Paul Moore wrote:
On Tue, Nov 15, 2022 at 12:58 PM Roberto Sassu roberto.sassu@huaweicloud.com wrote:
From: Roberto Sassu roberto.sassu@huawei.com
Define four return value flags (LSM_RET_NEG, LSM_RET_ZERO, LSM_RET_ONE, LSM_RET_GT_ONE), one for each interval of interest (< 0, = 0, = 1, > 1).
Redefine the LSM_HOOK() macro to add return value flags as argument, and set the correct flags for each LSM hook.
Implementors of new LSM hooks should do the same as well.
Cc: stable@vger.kernel.org # 5.7.x Fixes: 9d3fdea789c8 ("bpf: lsm: Provide attachment points for BPF LSM programs") Signed-off-by: Roberto Sassu roberto.sassu@huawei.com
include/linux/bpf_lsm.h | 2 +- include/linux/lsm_hook_defs.h | 779 ++++++++++++++++++++-------------- include/linux/lsm_hooks.h | 9 +- kernel/bpf/bpf_lsm.c | 5 +- security/bpf/hooks.c | 2 +- security/security.c | 4 +- 6 files changed, 466 insertions(+), 335 deletions(-)
Just a quick note here that even if we wanted to do something like this, it is absolutely not -stable kernel material. No way.
I was unsure about that. We need a proper fix for this issue that needs to be backported to some kernels. I saw this more like a dependency. But I agree with you that it would be unlikely that this patch is applied to stable kernels.
For stable kernels, what it would be the proper way? We still need to maintain an allow list of functions that allow a positive return value, at least. Should it be in the eBPF code only?
Thanks
Roberto
On Wed, Nov 16, 2022 at 3:11 AM Roberto Sassu roberto.sassu@huaweicloud.com wrote:
On Tue, 2022-11-15 at 21:27 -0500, Paul Moore wrote:
On Tue, Nov 15, 2022 at 12:58 PM Roberto Sassu roberto.sassu@huaweicloud.com wrote:
From: Roberto Sassu roberto.sassu@huawei.com
Define four return value flags (LSM_RET_NEG, LSM_RET_ZERO, LSM_RET_ONE, LSM_RET_GT_ONE), one for each interval of interest (< 0, = 0, = 1, > 1).
Redefine the LSM_HOOK() macro to add return value flags as argument, and set the correct flags for each LSM hook.
Implementors of new LSM hooks should do the same as well.
Cc: stable@vger.kernel.org # 5.7.x Fixes: 9d3fdea789c8 ("bpf: lsm: Provide attachment points for BPF LSM programs") Signed-off-by: Roberto Sassu roberto.sassu@huawei.com
include/linux/bpf_lsm.h | 2 +- include/linux/lsm_hook_defs.h | 779 ++++++++++++++++++++-------------- include/linux/lsm_hooks.h | 9 +- kernel/bpf/bpf_lsm.c | 5 +- security/bpf/hooks.c | 2 +- security/security.c | 4 +- 6 files changed, 466 insertions(+), 335 deletions(-)
Just a quick note here that even if we wanted to do something like this, it is absolutely not -stable kernel material. No way.
I was unsure about that. We need a proper fix for this issue that needs to be backported to some kernels. I saw this more like a dependency. But I agree with you that it would be unlikely that this patch is applied to stable kernels.
For stable kernels, what it would be the proper way? We still need to maintain an allow list of functions that allow a positive return value, at least. Should it be in the eBPF code only?
Ideally the fix for -stable is the same as what is done for Linus' kernel (ignoring backport fuzzing), so I would wait and see how that ends up first. However, if the patchset for Linus' tree is particularly large and touches a lot of code, you may need to work on something a bit more targeted to the specific problem. I tend to be more conservative than most kernel devs when it comes to -stable patches, but if you can't backport the main upstream patchset, smaller (both in terms of impact and lines changed) is almost always better.
On Wed, Nov 16, 2022 at 05:04:05PM -0500, Paul Moore wrote:
On Wed, Nov 16, 2022 at 3:11 AM Roberto Sassu roberto.sassu@huaweicloud.com wrote:
On Tue, 2022-11-15 at 21:27 -0500, Paul Moore wrote:
On Tue, Nov 15, 2022 at 12:58 PM Roberto Sassu roberto.sassu@huaweicloud.com wrote:
From: Roberto Sassu roberto.sassu@huawei.com
Define four return value flags (LSM_RET_NEG, LSM_RET_ZERO, LSM_RET_ONE, LSM_RET_GT_ONE), one for each interval of interest (< 0, = 0, = 1, > 1).
Redefine the LSM_HOOK() macro to add return value flags as argument, and set the correct flags for each LSM hook.
Implementors of new LSM hooks should do the same as well.
Cc: stable@vger.kernel.org # 5.7.x Fixes: 9d3fdea789c8 ("bpf: lsm: Provide attachment points for BPF LSM programs") Signed-off-by: Roberto Sassu roberto.sassu@huawei.com
include/linux/bpf_lsm.h | 2 +- include/linux/lsm_hook_defs.h | 779 ++++++++++++++++++++-------------- include/linux/lsm_hooks.h | 9 +- kernel/bpf/bpf_lsm.c | 5 +- security/bpf/hooks.c | 2 +- security/security.c | 4 +- 6 files changed, 466 insertions(+), 335 deletions(-)
Just a quick note here that even if we wanted to do something like this, it is absolutely not -stable kernel material. No way.
I was unsure about that. We need a proper fix for this issue that needs to be backported to some kernels. I saw this more like a dependency. But I agree with you that it would be unlikely that this patch is applied to stable kernels.
For stable kernels, what it would be the proper way? We still need to maintain an allow list of functions that allow a positive return value, at least. Should it be in the eBPF code only?
Ideally the fix for -stable is the same as what is done for Linus' kernel (ignoring backport fuzzing), so I would wait and see how that ends up first. However, if the patchset for Linus' tree is particularly large and touches a lot of code, you may need to work on something a bit more targeted to the specific problem. I tend to be more conservative than most kernel devs when it comes to -stable patches, but if you can't backport the main upstream patchset, smaller (both in terms of impact and lines changed) is almost always better.
No, the mainline patch (what is in Linus's tree), is almost always better and preferred for stable backports. When you diverge, bugs happen, almost every time, and it makes later fixes harder to backport as well.
But first work on solving the problem in Linus's tree. Don't worry about stable trees until after the correct solution is merged.
thanks,
greg k-h
On Thu, Nov 17, 2022 at 12:50 AM Greg KH gregkh@linuxfoundation.org wrote:
On Wed, Nov 16, 2022 at 05:04:05PM -0500, Paul Moore wrote:
On Wed, Nov 16, 2022 at 3:11 AM Roberto Sassu roberto.sassu@huaweicloud.com wrote:
On Tue, 2022-11-15 at 21:27 -0500, Paul Moore wrote:
On Tue, Nov 15, 2022 at 12:58 PM Roberto Sassu roberto.sassu@huaweicloud.com wrote:
From: Roberto Sassu roberto.sassu@huawei.com
Define four return value flags (LSM_RET_NEG, LSM_RET_ZERO, LSM_RET_ONE, LSM_RET_GT_ONE), one for each interval of interest (< 0, = 0, = 1, > 1).
Redefine the LSM_HOOK() macro to add return value flags as argument, and set the correct flags for each LSM hook.
Implementors of new LSM hooks should do the same as well.
Cc: stable@vger.kernel.org # 5.7.x Fixes: 9d3fdea789c8 ("bpf: lsm: Provide attachment points for BPF LSM programs") Signed-off-by: Roberto Sassu roberto.sassu@huawei.com
include/linux/bpf_lsm.h | 2 +- include/linux/lsm_hook_defs.h | 779 ++++++++++++++++++++-------------- include/linux/lsm_hooks.h | 9 +- kernel/bpf/bpf_lsm.c | 5 +- security/bpf/hooks.c | 2 +- security/security.c | 4 +- 6 files changed, 466 insertions(+), 335 deletions(-)
Just a quick note here that even if we wanted to do something like this, it is absolutely not -stable kernel material. No way.
I was unsure about that. We need a proper fix for this issue that needs to be backported to some kernels. I saw this more like a dependency. But I agree with you that it would be unlikely that this patch is applied to stable kernels.
For stable kernels, what it would be the proper way? We still need to maintain an allow list of functions that allow a positive return value, at least. Should it be in the eBPF code only?
Ideally the fix for -stable is the same as what is done for Linus' kernel (ignoring backport fuzzing), so I would wait and see how that ends up first. However, if the patchset for Linus' tree is particularly large and touches a lot of code, you may need to work on something a bit more targeted to the specific problem. I tend to be more conservative than most kernel devs when it comes to -stable patches, but if you can't backport the main upstream patchset, smaller (both in terms of impact and lines changed) is almost always better.
No, the mainline patch (what is in Linus's tree), is almost always better and preferred for stable backports. When you diverge, bugs happen, almost every time, and it makes later fixes harder to backport as well.
But first work on solving the problem in Linus's tree. Don't worry about stable trees until after the correct solution is merged.
Perhaps you missed my very first sentence where I mentioned exactly the same things: solve it in Linus' tree first, backports of patches in Linus' tree is ideal.
linux-stable-mirror@lists.linaro.org
-
Greg KH -
Paul Moore -
Roberto Sassu