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authorEric Paris <eparis@redhat.com>2008-11-11 21:48:22 +1100
committerJames Morris <jmorris@namei.org>2008-11-11 21:48:22 +1100
commite68b75a027bb94066576139ee33676264f867b87 (patch)
tree2c31f59a4abe9d7bb3cb75fdf3b57772feeeb6f6 /kernel
parent3fc689e96c0c90b6fede5946d6c31075e9464f69 (diff)
downloadop-kernel-dev-e68b75a027bb94066576139ee33676264f867b87.zip
op-kernel-dev-e68b75a027bb94066576139ee33676264f867b87.tar.gz
When the capset syscall is used it is not possible for audit to record the
actual capbilities being added/removed. This patch adds a new record type which emits the target pid and the eff, inh, and perm cap sets. example output if you audit capset syscalls would be: type=SYSCALL msg=audit(1225743140.465:76): arch=c000003e syscall=126 success=yes exit=0 a0=17f2014 a1=17f201c a2=80000000 a3=7fff2ab7f060 items=0 ppid=2160 pid=2223 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=1 comm="setcap" exe="/usr/sbin/setcap" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) type=UNKNOWN[1322] msg=audit(1225743140.465:76): pid=0 cap_pi=ffffffffffffffff cap_pp=ffffffffffffffff cap_pe=ffffffffffffffff Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/auditsc.c48
-rw-r--r--kernel/capability.c5
2 files changed, 53 insertions, 0 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 3229cd4..cef3423 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -204,6 +204,12 @@ struct audit_aux_data_bprm_fcaps {
struct audit_cap_data new_pcap;
};
+struct audit_aux_data_capset {
+ struct audit_aux_data d;
+ pid_t pid;
+ struct audit_cap_data cap;
+};
+
struct audit_tree_refs {
struct audit_tree_refs *next;
struct audit_chunk *c[31];
@@ -1397,6 +1403,14 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
break; }
+ case AUDIT_CAPSET: {
+ struct audit_aux_data_capset *axs = (void *)aux;
+ audit_log_format(ab, "pid=%d", axs->pid);
+ audit_log_cap(ab, "cap_pi", &axs->cap.inheritable);
+ audit_log_cap(ab, "cap_pp", &axs->cap.permitted);
+ audit_log_cap(ab, "cap_pe", &axs->cap.effective);
+ break; }
+
}
audit_log_end(ab);
}
@@ -2570,6 +2584,40 @@ void __audit_log_bprm_fcaps(struct linux_binprm *bprm, kernel_cap_t *pP, kernel_
}
/**
+ * __audit_log_capset - store information about the arguments to the capset syscall
+ * @pid target pid of the capset call
+ * @eff effective cap set
+ * @inh inheritible cap set
+ * @perm permited cap set
+ *
+ * Record the aguments userspace sent to sys_capset for later printing by the
+ * audit system if applicable
+ */
+int __audit_log_capset(pid_t pid, kernel_cap_t *eff, kernel_cap_t *inh, kernel_cap_t *perm)
+{
+ struct audit_aux_data_capset *ax;
+ struct audit_context *context = current->audit_context;
+
+ if (likely(!audit_enabled || !context || context->dummy))
+ return 0;
+
+ ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+ if (!ax)
+ return -ENOMEM;
+
+ ax->d.type = AUDIT_CAPSET;
+ ax->d.next = context->aux;
+ context->aux = (void *)ax;
+
+ ax->pid = pid;
+ ax->cap.effective = *eff;
+ ax->cap.inheritable = *eff;
+ ax->cap.permitted = *perm;
+
+ return 0;
+}
+
+/**
* audit_core_dumps - record information about processes that end abnormally
* @signr: signal value
*
diff --git a/kernel/capability.c b/kernel/capability.c
index e13a685..19f9eda 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -7,6 +7,7 @@
* 30 May 2002: Cleanup, Robert M. Love <rml@tech9.net>
*/
+#include <linux/audit.h>
#include <linux/capability.h>
#include <linux/mm.h>
#include <linux/module.h>
@@ -468,6 +469,10 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
i++;
}
+ ret = audit_log_capset(pid, &effective, &inheritable, &permitted);
+ if (ret)
+ return ret;
+
if (pid && (pid != task_pid_vnr(current)))
ret = do_sys_capset_other_tasks(pid, &effective, &inheritable,
&permitted);
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