From 152f497b9b5940f81de3205465840a5eb316458e Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Fri, 19 Apr 2013 13:56:11 -0400 Subject: [PATCH] audit: push loginuid and sessionid processing down Since we are always current, we can push a lot of this stuff to the bottom and get rid of useless interfaces and arguments. Signed-off-by: Eric Paris --- drivers/tty/tty_audit.c | 72 ++++++++++++++--------------------------- include/linux/tty.h | 4 +-- kernel/audit.c | 2 +- 3 files changed, 27 insertions(+), 51 deletions(-) diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c index 1e4e9f30ea0..ea2e5ad7173 100644 --- a/drivers/tty/tty_audit.c +++ b/drivers/tty/tty_audit.c @@ -60,24 +60,22 @@ static void tty_audit_buf_put(struct tty_audit_buf *buf) tty_audit_buf_free(buf); } -static void tty_audit_log(const char *description, struct task_struct *tsk, - kuid_t loginuid, unsigned sessionid, int major, - int minor, unsigned char *data, size_t size) +static void tty_audit_log(const char *description, int major, int minor, + unsigned char *data, size_t size) { struct audit_buffer *ab; + struct task_struct *tsk = current; + uid_t uid = from_kuid(&init_user_ns, task_uid(tsk)); + uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(tsk)); + u32 sessionid = audit_get_sessionid(tsk); ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_TTY); if (ab) { char name[sizeof(tsk->comm)]; - kuid_t uid = task_uid(tsk); - - audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u " - "major=%d minor=%d comm=", description, - tsk->pid, - from_kuid(&init_user_ns, uid), - from_kuid(&init_user_ns, loginuid), - sessionid, - major, minor); + + audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u major=%d" + " minor=%d comm=", description, tsk->pid, uid, + loginuid, sessionid, major, minor); get_task_comm(name, tsk); audit_log_untrustedstring(ab, name); audit_log_format(ab, " data="); @@ -90,11 +88,9 @@ static void tty_audit_log(const char *description, struct task_struct *tsk, * tty_audit_buf_push - Push buffered data out * * Generate an audit message from the contents of @buf, which is owned by - * @tsk with @loginuid. @buf->mutex must be locked. + * the current task. @buf->mutex must be locked. */ -static void tty_audit_buf_push(struct task_struct *tsk, kuid_t loginuid, - unsigned int sessionid, - struct tty_audit_buf *buf) +static void tty_audit_buf_push(struct tty_audit_buf *buf) { if (buf->valid == 0) return; @@ -102,24 +98,10 @@ static void tty_audit_buf_push(struct task_struct *tsk, kuid_t loginuid, buf->valid = 0; return; } - tty_audit_log("tty", tsk, loginuid, sessionid, buf->major, buf->minor, - buf->data, buf->valid); + tty_audit_log("tty", buf->major, buf->minor, buf->data, buf->valid); buf->valid = 0; } -/** - * tty_audit_buf_push_current - Push buffered data out - * - * Generate an audit message from the contents of @buf, which is owned by - * the current task. @buf->mutex must be locked. - */ -static void tty_audit_buf_push_current(struct tty_audit_buf *buf) -{ - kuid_t auid = audit_get_loginuid(current); - unsigned int sessionid = audit_get_sessionid(current); - tty_audit_buf_push(current, auid, sessionid, buf); -} - /** * tty_audit_exit - Handle a task exit * @@ -138,7 +120,7 @@ void tty_audit_exit(void) return; mutex_lock(&buf->mutex); - tty_audit_buf_push_current(buf); + tty_audit_buf_push(buf); mutex_unlock(&buf->mutex); tty_audit_buf_put(buf); @@ -176,7 +158,7 @@ void tty_audit_tiocsti(struct tty_struct *tty, char ch) if (buf) { mutex_lock(&buf->mutex); if (buf->major == major && buf->minor == minor) - tty_audit_buf_push_current(buf); + tty_audit_buf_push(buf); mutex_unlock(&buf->mutex); tty_audit_buf_put(buf); } @@ -187,27 +169,21 @@ void tty_audit_tiocsti(struct tty_struct *tty, char ch) auid = audit_get_loginuid(current); sessionid = audit_get_sessionid(current); - tty_audit_log("ioctl=TIOCSTI", current, auid, sessionid, major, - minor, &ch, 1); + tty_audit_log("ioctl=TIOCSTI", major, minor, &ch, 1); } } /** - * tty_audit_push_task - Flush task's pending audit data - * @tsk: task pointer - * @loginuid: sender login uid - * @sessionid: sender session id + * tty_audit_push_current - Flush current's pending audit data * - * Called with a ref on @tsk held. Try to lock sighand and get a - * reference to the tty audit buffer if available. + * Try to lock sighand and get a reference to the tty audit buffer if available. * Flush the buffer or return an appropriate error code. */ -int tty_audit_push_task(struct task_struct *tsk) +int tty_audit_push_current(void) { struct tty_audit_buf *buf = ERR_PTR(-EPERM); + struct task_struct *tsk = current; unsigned long flags; - kuid_t loginuid = audit_get_loginuid(tsk); - u32 sessionid = audit_get_sessionid(tsk); if (!lock_task_sighand(tsk, &flags)) return -ESRCH; @@ -227,7 +203,7 @@ int tty_audit_push_task(struct task_struct *tsk) return PTR_ERR(buf); mutex_lock(&buf->mutex); - tty_audit_buf_push(tsk, loginuid, sessionid, buf); + tty_audit_buf_push(buf); mutex_unlock(&buf->mutex); tty_audit_buf_put(buf); @@ -311,7 +287,7 @@ void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, minor = tty->driver->minor_start + tty->index; if (buf->major != major || buf->minor != minor || buf->icanon != icanon) { - tty_audit_buf_push_current(buf); + tty_audit_buf_push(buf); buf->major = major; buf->minor = minor; buf->icanon = icanon; @@ -327,7 +303,7 @@ void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, data += run; size -= run; if (buf->valid == N_TTY_BUF_SIZE) - tty_audit_buf_push_current(buf); + tty_audit_buf_push(buf); } while (size != 0); mutex_unlock(&buf->mutex); tty_audit_buf_put(buf); @@ -359,7 +335,7 @@ void tty_audit_push(struct tty_struct *tty) minor = tty->driver->minor_start + tty->index; mutex_lock(&buf->mutex); if (buf->major == major && buf->minor == minor) - tty_audit_buf_push_current(buf); + tty_audit_buf_push(buf); mutex_unlock(&buf->mutex); tty_audit_buf_put(buf); } diff --git a/include/linux/tty.h b/include/linux/tty.h index 78e378b3971..96d640b32cd 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -517,7 +517,7 @@ extern void tty_audit_exit(void); extern void tty_audit_fork(struct signal_struct *sig); extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); extern void tty_audit_push(struct tty_struct *tty); -extern int tty_audit_push_task(struct task_struct *tsk); +extern int tty_audit_push_current(void); #else static inline void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, size_t size, unsigned icanon) @@ -535,7 +535,7 @@ static inline void tty_audit_fork(struct signal_struct *sig) static inline void tty_audit_push(struct tty_struct *tty) { } -static inline int tty_audit_push_task(struct task_struct *tsk) +static inline int tty_audit_push_current(void) { return 0; } diff --git a/kernel/audit.c b/kernel/audit.c index bf1e1330cbb..79b42fd14c2 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -727,7 +727,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) if (err == 1) { err = 0; if (msg_type == AUDIT_USER_TTY) { - err = tty_audit_push_task(current); + err = tty_audit_push_current(); if (err) break; } -- 2.46.0