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authorWilliam Roberts <bill.c.roberts@gmail.com>2014-02-11 10:12:01 -0800
committerEric Paris <eparis@redhat.com>2014-03-20 10:10:52 -0400
commit3f1c82502c299da08b7b7f08b435212e51166ed9 (patch)
tree227bb78a5ab4b90c7293920e79e7b3d13add855e /kernel/audit.h
parent21a6457a79a02908dc8e60fe820828b2cc72d13a (diff)
downloadlinux-sh-3f1c82502c299da08b7b7f08b435212e51166ed9.tar.gz
audit: Audit proc/<pid>/cmdline aka proctitle
During an audit event, cache and print the value of the process's proctitle value (proc/<pid>/cmdline). This is useful in situations where processes are started via fork'd virtual machines where the comm field is incorrect. Often times, setting the comm field still is insufficient as the comm width is not very wide and most virtual machine "package names" do not fit. Also, during execution, many threads have their comm field set as well. By tying it back to the global cmdline value for the process, audit records will be more complete in systems with these properties. An example of where this is useful and applicable is in the realm of Android. With Android, their is no fork/exec for VM instances. The bare, preloaded Dalvik VM listens for a fork and specialize request. When this request comes in, the VM forks, and the loads the specific application (specializing). This was done to take advantage of COW and to not require a load of basic packages by the VM on very app spawn. When this spawn occurs, the package name is set via setproctitle() and shows up in procfs. Many of these package names are longer then 16 bytes, the historical width of task->comm. Having the cmdline in the audit records will couple the application back to the record directly. Also, on my Debian development box, some audit records were more useful then what was printed under comm. The cached proctitle is tied to the life-cycle of the audit_context structure and is built on demand. Proctitle is controllable by userspace, and thus should not be trusted. It is meant as an aid to assist in debugging. The proctitle event is emitted during syscall audits, and can be filtered with auditctl. Example: type=AVC msg=audit(1391217013.924:386): avc: denied { getattr } for pid=1971 comm="mkdir" name="/" dev="selinuxfs" ino=1 scontext=system_u:system_r:consolekit_t:s0-s0:c0.c255 tcontext=system_u:object_r:security_t:s0 tclass=filesystem type=SYSCALL msg=audit(1391217013.924:386): arch=c000003e syscall=137 success=yes exit=0 a0=7f019dfc8bd7 a1=7fffa6aed2c0 a2=fffffffffff4bd25 a3=7fffa6aed050 items=0 ppid=1967 pid=1971 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="mkdir" exe="/bin/mkdir" subj=system_u:system_r:consolekit_t:s0-s0:c0.c255 key=(null) type=UNKNOWN[1327] msg=audit(1391217013.924:386): proctitle=6D6B646972002D70002F7661722F72756E2F636F6E736F6C65 Acked-by: Steve Grubb <sgrubb@redhat.com> (wrt record formating) Signed-off-by: William Roberts <wroberts@tresys.com> Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'kernel/audit.h')
-rw-r--r--kernel/audit.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/audit.h b/kernel/audit.h
index 57cc64d67718..38c967d28de5 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -106,6 +106,11 @@ struct audit_names {
bool should_free;
};
+struct audit_proctitle {
+ int len; /* length of the cmdline field. */
+ char *value; /* the cmdline field */
+};
+
/* The per-task audit context. */
struct audit_context {
int dummy; /* must be the first element */
@@ -202,6 +207,7 @@ struct audit_context {
} execve;
};
int fds[2];
+ struct audit_proctitle proctitle;
#if AUDIT_DEBUG
int put_count;