[PATCH] export sessionid alongside the loginuid in procfs

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 9a4da0aae02e442e5be76fa84a0907a43e1bf848..8a10f6fe24a166cf1a4c25cc9b79fa56a1cdbe07 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1036,6 +1036,26 @@ static const struct file_operations proc_loginuid_operations = {
        .read           = proc_loginuid_read,
        .write          = proc_loginuid_write,
 };
+
+static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
+                                 size_t count, loff_t *ppos)
+{
+       struct inode * inode = file->f_path.dentry->d_inode;
+       struct task_struct *task = get_proc_task(inode);
+       ssize_t length;
+       char tmpbuf[TMPBUFLEN];
+
+       if (!task)
+               return -ESRCH;
+       length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
+                               audit_get_sessionid(task));
+       put_task_struct(task);
+       return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static const struct file_operations proc_sessionid_operations = {
+       .read           = proc_sessionid_read,
+};
 #endif
 
 #ifdef CONFIG_FAULT_INJECTION
@@ -2319,6 +2339,7 @@ static const struct pid_entry tgid_base_stuff[] = {
        REG("oom_adj",    S_IRUGO|S_IWUSR, oom_adjust),
 #ifdef CONFIG_AUDITSYSCALL
        REG("loginuid",   S_IWUSR|S_IRUGO, loginuid),
+       REG("sessionid",  S_IRUSR, sessionid),
 #endif
 #ifdef CONFIG_FAULT_INJECTION
        REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject),
@@ -2649,6 +2670,7 @@ static const struct pid_entry tid_base_stuff[] = {
        REG("oom_adj",   S_IRUGO|S_IWUSR, oom_adjust),
 #ifdef CONFIG_AUDITSYSCALL
        REG("loginuid",  S_IWUSR|S_IRUGO, loginuid),
+       REG("sessionid",  S_IRUSR, sessionid),
 #endif
 #ifdef CONFIG_FAULT_INJECTION
        REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject),