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Kees Cook f09fb7ff2a io_uring: Replace 0-length array with flexible array 
commit 36632d0629 upstream.

Zero-length arrays are deprecated[1]. Replace struct io_uring_buf_ring's
"bufs" with a flexible array member. (How is the size of this array
verified?) Detected with GCC 13, using -fstrict-flex-arrays=3:

In function 'io_ring_buffer_select',
    inlined from 'io_buffer_select' at io_uring/kbuf.c:183:10:
io_uring/kbuf.c:141:23: warning: array subscript 255 is outside the bounds of an interior zero-length array 'struct io_uring_buf[0]' [-Wzero-length-bounds]
  141 |                 buf = &br->bufs[head];
      |                       ^~~~~~~~~~~~~~~
In file included from include/linux/io_uring.h:7,
                 from io_uring/kbuf.c:10:
include/uapi/linux/io_uring.h: In function 'io_buffer_select':
include/uapi/linux/io_uring.h:628:41: note: while referencing 'bufs'
  628 |                 struct io_uring_buf     bufs[0];
      |                                         ^~~~

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays

Fixes: c7fb19428d ("io_uring: add support for ring mapped supplied buffers")
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Pavel Begunkov <asml.silence@gmail.com>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: stable@vger.kernel.org
Cc: io-uring@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230105190507.gonna.131-kees@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-03-10 09:34:03 +01:00
..
acpi ACPI: Fix selecting wrong ACPI fwnode for the iGPU on some Dell laptops 2023-01-18 11:58:11 +01:00
asm-generic arch: fix broken BuildID for arm64 and riscv 2023-02-25 11:25:42 +01:00
clocksource
crypto
drm drm/drm_print: correct format problem 2023-03-10 09:33:57 +01:00
dt-bindings dt-bindings: clocks: imx8mp: Add ID for usb suspend clock 2022-12-31 13:33:09 +01:00
keys
kunit kunit: fix kunit_test_init_section_suites(...) 2023-02-09 11:28:08 +01:00
kvm
linux uaccess: Add minimum bounds check on kernel buffer size 2023-03-10 09:33:52 +01:00
math-emu
media media: dvbdev: fix build warning due to comments 2022-12-31 13:33:12 +01:00
memory
misc
net net: add sock_init_data_uid() 2023-03-10 09:33:01 +01:00
pcmcia
ras
rdma
rv
scsi scsi: libsas: Add smp_ata_check_ready_type() 2023-02-25 11:25:39 +01:00
soc ARM: at91: pm: avoid soft resetting AC DLL 2022-11-01 12:25:19 +02:00
sound ASoC: soc-dapm.h: fixup warning struct snd_pcm_substream not declared 2023-03-10 09:33:23 +01:00
target
trace devlink: Fix TP_STRUCT_entry in trace of devlink health report 2023-03-10 09:33:54 +01:00
uapi io_uring: Replace 0-length array with flexible array 2023-03-10 09:34:03 +01:00
ufs scsi: ufs: exynos: Fix DMA alignment for PAGE_SIZE != 4096 2023-03-10 09:33:15 +01:00
vdso
video
xen