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tomoyo: fix UAF write bug in tomoyo_write_control()

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commit 2f03fc340c upstream.

Since tomoyo_write_control() updates head->write_buf when write()
of long lines is requested, we need to fetch head->write_buf after
head->io_sem is held.  Otherwise, concurrent write() requests can
cause use-after-free-write and double-free problems.

Reported-by: Sam Sun <samsun1006219@gmail.com>
Closes: https://lkml.kernel.org/r/CAEkJfYNDspuGxYx5kym8Lvp--D36CMDUErg4rxfWFJuPbbji8g@mail.gmail.com
Fixes: bd03a3e4c9 ("TOMOYO: Add policy namespace support.")
Cc:  <stable@vger.kernel.org> # Linux 3.1+
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tetsuo Handa 2024-03-01 22:04:06 +09:00 committed by Greg Kroah-Hartman
parent 8f626221e5
commit 3bfe04c127
1 changed files with 2 additions and 1 deletions
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3
security/tomoyo/common.c
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@ -2648,13 +2648,14 @@ ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
{
int error = buffer_len;
size_t avail_len = buffer_len;
char *cp0 = head->write_buf;
char *cp0;
int idx;
if (!head->write)
return -EINVAL;
if (mutex_lock_interruptible(&head->io_sem))
return -EINTR;
cp0 = head->write_buf;
head->read_user_buf_avail = 0;
idx = tomoyo_read_lock();
/* Read a line and dispatch it to the policy handler. */