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| author | David Quigley <dpquigl@tycho.nsa.gov> | 2006-06-30 01:55:46 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-30 11:25:36 -0700 |
| commit | f9008e4c5c525941967b67777945aa6266ab6326 (patch) | |
| tree | a0c9436485b80d548ef74d5f1aec0f6d0309af6e /security | |
| parent | ed11d9eb2228acc483c819ab353e3c41bcb158fa (diff) | |
| download | lwn-f9008e4c5c525941967b67777945aa6266ab6326.tar.gz lwn-f9008e4c5c525941967b67777945aa6266ab6326.zip | |
[PATCH] SELinux: extend task_kill hook to handle signals sent by AIO completion
This patch extends the security_task_kill hook to handle signals sent by AIO
completion. In this case, the secid of the task responsible for the signal
needs to be obtained and saved earlier, so a security_task_getsecid() hook is
added, and then this saved value is passed subsequently to the extended
task_kill hook for use in checking.
Signed-off-by: David Quigley <dpquigl@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/dummy.c | 6 | ||||
| -rw-r--r-- | security/selinux/hooks.c | 20 |
2 files changed, 21 insertions, 5 deletions
diff --git a/security/dummy.c b/security/dummy.c index 913540808577..de53f6eb0c08 100644 --- a/security/dummy.c +++ b/security/dummy.c @@ -506,6 +506,9 @@ static int dummy_task_getsid (struct task_struct *p) return 0; } +static void dummy_task_getsecid (struct task_struct *p, u32 *secid) +{ } + static int dummy_task_setgroups (struct group_info *group_info) { return 0; @@ -548,7 +551,7 @@ static int dummy_task_wait (struct task_struct *p) } static int dummy_task_kill (struct task_struct *p, struct siginfo *info, - int sig) + int sig, u32 secid) { return 0; } @@ -981,6 +984,7 @@ void security_fixup_ops (struct security_operations *ops) set_to_dummy_if_null(ops, task_setpgid); set_to_dummy_if_null(ops, task_getpgid); set_to_dummy_if_null(ops, task_getsid); + set_to_dummy_if_null(ops, task_getsecid); set_to_dummy_if_null(ops, task_setgroups); set_to_dummy_if_null(ops, task_setnice); set_to_dummy_if_null(ops, task_setioprio); diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index b85afcf38527..a5189a347354 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2644,6 +2644,11 @@ static int selinux_task_getsid(struct task_struct *p) return task_has_perm(current, p, PROCESS__GETSESSION); } +static void selinux_task_getsecid(struct task_struct *p, u32 *secid) +{ + selinux_get_task_sid(p, secid); +} + static int selinux_task_setgroups(struct group_info *group_info) { /* See the comment for setuid above. */ @@ -2700,12 +2705,14 @@ static int selinux_task_movememory(struct task_struct *p) return task_has_perm(current, p, PROCESS__SETSCHED); } -static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int sig) +static int selinux_task_kill(struct task_struct *p, struct siginfo *info, + int sig, u32 secid) { u32 perm; int rc; + struct task_security_struct *tsec; - rc = secondary_ops->task_kill(p, info, sig); + rc = secondary_ops->task_kill(p, info, sig, secid); if (rc) return rc; @@ -2716,8 +2723,12 @@ static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int si perm = PROCESS__SIGNULL; /* null signal; existence test */ else perm = signal_to_av(sig); - - return task_has_perm(current, p, perm); + tsec = p->security; + if (secid) + rc = avc_has_perm(secid, tsec->sid, SECCLASS_PROCESS, perm, NULL); + else + rc = task_has_perm(current, p, perm); + return rc; } static int selinux_task_prctl(int option, @@ -4434,6 +4445,7 @@ static struct security_operations selinux_ops = { .task_setpgid = selinux_task_setpgid, .task_getpgid = selinux_task_getpgid, .task_getsid = selinux_task_getsid, + .task_getsecid = selinux_task_getsecid, .task_setgroups = selinux_task_setgroups, .task_setnice = selinux_task_setnice, .task_setioprio = selinux_task_setioprio, |