[SRU][Mantic][PATCH 0/2] CVE-2024-0582

[Yuxuan Luo]

[Impact]
A memory leak flaw was found in the Linux kernel’s io_uring functionality
in how a user registers a buffer ring with IORING_REGISTER_PBUF_RING,
mmap() it, and then frees it. This flaw allows a local user to crash or
potentially escalate their privileges on the system.

[Backport]
The fix commit requires edecf1689768 (“io_uring: enable
io_mem_alloc/free to be used in other parts”) so that kbuf.c has the
access to io_mem_alloc/free functions, preventing implicit declaration
build error.

[Test]
Tested against liburing/test/buf-ring-nommap.

[Potential Regression]
Regression is limited in the use case of setting io_uring up with
IOU_PBUF_RING_MMAP.


Jens Axboe (1):
  io_uring/kbuf: defer release of mapped buffer rings

 include/linux/io_uring_types.h |  3 +++
 io_uring/io_uring.c            |  2 ++
 io_uring/kbuf.c                | 44 ++++++++++++++++++++++++++++++----
 io_uring/kbuf.h                |  2 ++
 4 files changed, 46 insertions(+), 5 deletions(-)

-- 
2.34.1