scsi: bsg: Fix TOCTOU in io_uring passthrough command setup

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scsi_bsg_uring_cmd() reads bsg_uring_cmd from the shared mmap'd SQE.
Userspace can change a field after we check it and before we use it.
request_len is the sharp case: it can grow past sizeof(scmd->cmnd) after
the bound check and overflow scmd->cmnd in copy_from_user().

READ_ONCE() the SQE fields we check or use into locals before use.

Fixes: 7b6d3255e7 ("scsi: bsg: add io_uring passthrough handler")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20260527105931.3950913-1-rc@rexion.ai
Signed-off-by: Rahul Chandelkar <rc@rexion.ai>
Co-developed-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
Link: https://patch.msgid.link/20260817080730.967879-3-yangxiuwei@kylinos.cn
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>

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Rahul Chandelkar 2026-08-17 16:07:29 +08:00 • committed by Martin K. Petersen (Oracle)

parent ece06de726

commit 4b3c5965fc

1 changed files with 25 additions and 14 deletions

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drivers/scsi/scsi_bsg.c

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