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authorPeter Hurley <peter@hurleysoftware.com>2016-01-09 22:55:30 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-01-27 16:41:04 -0800
commitb50819f437c094b4beb2e8684fbe12bbe79fb331 (patch)
tree2b039e0871315df7711346116f571ede03e39012 /drivers/tty/tty_audit.c
parentf229c2c161de94a404fa16a17cb93c4a06938af5 (diff)
tty: audit: Ignore current association for audit push
In canonical read mode, each line read and logged is pushed separately with tty_audit_push(). For all single-threaded processes and multi-threaded processes reading from only one tty, this patch has no effect; the last line read will still be the entry pushed to the audit log because the tty association cannot have changed between tty_audit_add_data() and tty_audit_push(). For multi-threaded processes reading from different ttys concurrently, the audit log will have mixed log entries anyway. Consider two ttys audited concurrently: CPU0 CPU1 ---------- ------------ tty_audit_add_data(ttyA) tty_audit_add_data(ttyB) tty_audit_push() tty_audit_add_data(ttyB) tty_audit_push() This patch will now cause the ttyB output to be split into separate audit log entries. However, this possibility is equally likely without this patch: CPU0 CPU1 ---------- ------------ tty_audit_add_data(ttyB) tty_audit_add_data(ttyA) tty_audit_push() tty_audit_add_data(ttyB) tty_audit_push() Mixed canonical and non-canonical reads have similar races. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_audit.c')
-rw-r--r--drivers/tty/tty_audit.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c
index 5f65653cee48..5ae48396e265 100644
--- a/drivers/tty/tty_audit.c
+++ b/drivers/tty/tty_audit.c
@@ -313,9 +313,9 @@ void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size)
/**
* tty_audit_push - Push buffered data out
*
- * Make sure no audit data is pending for @tty on the current process.
+ * Make sure no audit data is pending on the current process.
*/
-void tty_audit_push(struct tty_struct *tty)
+void tty_audit_push(void)
{
struct tty_audit_buf *buf;
unsigned long flags;
@@ -331,13 +331,8 @@ void tty_audit_push(struct tty_struct *tty)
spin_unlock_irqrestore(&current->sighand->siglock, flags);
if (buf) {
- int major, minor;
-
- major = tty->driver->major;
- minor = tty->driver->minor_start + tty->index;
mutex_lock(&buf->mutex);
- if (buf->major == major && buf->minor == minor)
- tty_audit_buf_push(buf);
+ tty_audit_buf_push(buf);
mutex_unlock(&buf->mutex);
tty_audit_buf_put(buf);
}