diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/capability.h | 3 | ||||
| -rw-r--r-- | include/linux/init_task.h | 3 | ||||
| -rw-r--r-- | include/linux/prctl.h | 9 | ||||
| -rw-r--r-- | include/linux/sched.h | 3 | ||||
| -rw-r--r-- | include/linux/securebits.h | 25 | ||||
| -rw-r--r-- | include/linux/security.h | 16 |
6 files changed, 38 insertions, 21 deletions
diff --git a/include/linux/capability.h b/include/linux/capability.h index 7d50ff6d269..eaab759b146 100644 --- a/include/linux/capability.h +++ b/include/linux/capability.h @@ -155,6 +155,7 @@ typedef struct kernel_cap_struct { * Add any capability from current's capability bounding set * to the current process' inheritable set * Allow taking bits out of capability bounding set + * Allow modification of the securebits for a process */ #define CAP_SETPCAP 8 @@ -490,8 +491,6 @@ extern const kernel_cap_t __cap_init_eff_set; int capable(int cap); int __capable(struct task_struct *t, int cap); -extern long cap_prctl_drop(unsigned long cap); - #endif /* __KERNEL__ */ #endif /* !_LINUX_CAPABILITY_H */ diff --git a/include/linux/init_task.h b/include/linux/init_task.h index 37a6f5bc4a9..bf6b8a61f8d 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -9,6 +9,7 @@ #include <linux/ipc.h> #include <linux/pid_namespace.h> #include <linux/user_namespace.h> +#include <linux/securebits.h> #include <net/net_namespace.h> #define INIT_FDTABLE \ @@ -172,7 +173,7 @@ extern struct group_info init_groups; .cap_inheritable = CAP_INIT_INH_SET, \ .cap_permitted = CAP_FULL_SET, \ .cap_bset = CAP_INIT_BSET, \ - .keep_capabilities = 0, \ + .securebits = SECUREBITS_DEFAULT, \ .user = INIT_USER, \ .comm = "swapper", \ .thread = INIT_THREAD, \ diff --git a/include/linux/prctl.h b/include/linux/prctl.h index 5c80b193963..5ad79198d6f 100644 --- a/include/linux/prctl.h +++ b/include/linux/prctl.h @@ -16,7 +16,8 @@ # define PR_UNALIGN_NOPRINT 1 /* silently fix up unaligned user accesses */ # define PR_UNALIGN_SIGBUS 2 /* generate SIGBUS on unaligned user access */ -/* Get/set whether or not to drop capabilities on setuid() away from uid 0 */ +/* Get/set whether or not to drop capabilities on setuid() away from + * uid 0 (as per security/commoncap.c) */ #define PR_GET_KEEPCAPS 7 #define PR_SET_KEEPCAPS 8 @@ -63,7 +64,7 @@ #define PR_GET_SECCOMP 21 #define PR_SET_SECCOMP 22 -/* Get/set the capability bounding set */ +/* Get/set the capability bounding set (as per security/commoncap.c) */ #define PR_CAPBSET_READ 23 #define PR_CAPBSET_DROP 24 @@ -73,4 +74,8 @@ # define PR_TSC_ENABLE 1 /* allow the use of the timestamp counter */ # define PR_TSC_SIGSEGV 2 /* throw a SIGSEGV instead of reading the TSC */ +/* Get/set securebits (as per security/commoncap.c) */ +#define PR_GET_SECUREBITS 27 +#define PR_SET_SECUREBITS 28 + #endif /* _LINUX_PRCTL_H */ diff --git a/include/linux/sched.h b/include/linux/sched.h index 9a4f3e63e3b..024d72b47a0 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -68,7 +68,6 @@ struct sched_param { #include <linux/smp.h> #include <linux/sem.h> #include <linux/signal.h> -#include <linux/securebits.h> #include <linux/fs_struct.h> #include <linux/compiler.h> #include <linux/completion.h> @@ -1133,7 +1132,7 @@ struct task_struct { gid_t gid,egid,sgid,fsgid; struct group_info *group_info; kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset; - unsigned keep_capabilities:1; + unsigned securebits; struct user_struct *user; #ifdef CONFIG_KEYS struct key *request_key_auth; /* assumed request_key authority */ diff --git a/include/linux/securebits.h b/include/linux/securebits.h index 5b0617840fa..c1f19dbceb0 100644 --- a/include/linux/securebits.h +++ b/include/linux/securebits.h @@ -3,28 +3,39 @@ #define SECUREBITS_DEFAULT 0x00000000 -extern unsigned securebits; - /* When set UID 0 has no special privileges. When unset, we support inheritance of root-permissions and suid-root executable under compatibility mode. We raise the effective and inheritable bitmasks *of the executable file* if the effective uid of the new process is 0. If the real uid is 0, we raise the inheritable bitmask of the executable file. */ -#define SECURE_NOROOT 0 +#define SECURE_NOROOT 0 +#define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */ /* When set, setuid to/from uid 0 does not trigger capability-"fixes" to be compatible with old programs relying on set*uid to loose privileges. When unset, setuid doesn't change privileges. */ -#define SECURE_NO_SETUID_FIXUP 2 +#define SECURE_NO_SETUID_FIXUP 2 +#define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */ + +/* When set, a process can retain its capabilities even after + transitioning to a non-root user (the set-uid fixup suppressed by + bit 2). Bit-4 is cleared when a process calls exec(); setting both + bit 4 and 5 will create a barrier through exec that no exec()'d + child can use this feature again. */ +#define SECURE_KEEP_CAPS 4 +#define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */ /* Each securesetting is implemented using two bits. One bit specify whether the setting is on or off. The other bit specify whether the setting is fixed or not. A setting which is fixed cannot be changed from user-level. */ +#define issecure_mask(X) (1 << (X)) +#define issecure(X) (issecure_mask(X) & current->securebits) -#define issecure(X) ( (1 << (X+1)) & SECUREBITS_DEFAULT ? \ - (1 << (X)) & SECUREBITS_DEFAULT : \ - (1 << (X)) & securebits ) +#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \ + issecure_mask(SECURE_NO_SETUID_FIXUP) | \ + issecure_mask(SECURE_KEEP_CAPS)) +#define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) #endif /* !_LINUX_SECUREBITS_H */ diff --git a/include/linux/security.h b/include/linux/security.h index 53a34539382..e6299e50e21 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -34,8 +34,6 @@ #include <linux/xfrm.h> #include <net/flow.h> -extern unsigned securebits; - /* Maximum number of letters for an LSM name string */ #define SECURITY_NAME_MAX 10 @@ -61,6 +59,8 @@ extern int cap_inode_need_killpriv(struct dentry *dentry); extern int cap_inode_killpriv(struct dentry *dentry); extern int cap_task_post_setuid (uid_t old_ruid, uid_t old_euid, uid_t old_suid, int flags); extern void cap_task_reparent_to_init (struct task_struct *p); +extern int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3, + unsigned long arg4, unsigned long arg5, long *rc_p); extern int cap_task_setscheduler (struct task_struct *p, int policy, struct sched_param *lp); extern int cap_task_setioprio (struct task_struct *p, int ioprio); extern int cap_task_setnice (struct task_struct *p, int nice); @@ -720,7 +720,9 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts) * @arg3 contains a argument. * @arg4 contains a argument. * @arg5 contains a argument. - * Return 0 if permission is granted. + * @rc_p contains a pointer to communicate back the forced return code + * Return 0 if permission is granted, and non-zero if the security module + * has taken responsibility (setting *rc_p) for the prctl call. * @task_reparent_to_init: * Set the security attributes in @p->security for a kernel thread that * is being reparented to the init task. @@ -1420,7 +1422,7 @@ struct security_operations { int (*task_wait) (struct task_struct * p); int (*task_prctl) (int option, unsigned long arg2, unsigned long arg3, unsigned long arg4, - unsigned long arg5); + unsigned long arg5, long *rc_p); void (*task_reparent_to_init) (struct task_struct * p); void (*task_to_inode)(struct task_struct *p, struct inode *inode); @@ -1684,7 +1686,7 @@ int security_task_kill(struct task_struct *p, struct siginfo *info, int sig, u32 secid); int security_task_wait(struct task_struct *p); int security_task_prctl(int option, unsigned long arg2, unsigned long arg3, - unsigned long arg4, unsigned long arg5); + unsigned long arg4, unsigned long arg5, long *rc_p); void security_task_reparent_to_init(struct task_struct *p); void security_task_to_inode(struct task_struct *p, struct inode *inode); int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag); @@ -2271,9 +2273,9 @@ static inline int security_task_wait (struct task_struct *p) static inline int security_task_prctl (int option, unsigned long arg2, unsigned long arg3, unsigned long arg4, - unsigned long arg5) + unsigned long arg5, long *rc_p) { - return 0; + return cap_task_prctl(option, arg2, arg3, arg3, arg5, rc_p); } static inline void security_task_reparent_to_init (struct task_struct *p) |