[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>

1 files changed, 22 insertions, 0 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 9a4da0aae02e..8a10f6fe24a1 100644
--- 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),