Re: [PATCH] xtensa: simdisk: add input size check in proc_write_simdisk

On Fri, Aug 29, 2025 at 1:30 AM Miaoqian Lin linmq006@gmail.com wrote:

A malicious user could pass an arbitrarily bad value to memdup_user_nul(), potentially causing kernel crash.

This follows the same pattern as commit ee76746387f6 ("netdevsim: prevent bad user input in nsim_dev_health_break_write()")

Fixes: b6c7e873daf7 ("xtensa: ISS: add host file-based simulated disk") Fixes: 16e5c1fc3604 ("convert a bunch of open-coded instances of memdup_user_nul()") Cc: stable@vger.kernel.org Signed-off-by: Miaoqian Lin linmq006@gmail.com

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arch/xtensa/platforms/iss/simdisk.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

Thanks. Applied to my xtensa tree.

-- Max