Messages in this thread | | | Date | Wed, 3 Nov 2021 17:01:22 +0000 | From | Lee Jones <> | Subject | Re: [syzbot] KASAN: stack-out-of-bounds Read in iov_iter_revert |
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Good afternoon Pavel,
> syzbot has tested the proposed patch and the reproducer did not trigger any issue: > > Reported-and-tested-by: syzbot+9671693590ef5aad8953@syzkaller.appspotmail.com > > Tested on: > > commit: bff2c168 io_uring: don't retry with truncated iter > git tree: https://github.com/isilence/linux.git truncate > kernel config: https://syzkaller.appspot.com/x/.config?x=730106bfb5bf8ace > dashboard link: https://syzkaller.appspot.com/bug?extid=9671693590ef5aad8953 > compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1 > > Note: testing is done by a robot and is best-effort only.
As you can see in the 'dashboard link' above this bug also affects android-5-10 which is currently based on v5.10.75.
I see that the back-port of this patch failed in v5.10.y:
https://lore.kernel.org/stable/163152589512611@kroah.com/
And after solving the build-error by back-porting both:
2112ff5ce0c11 iov_iter: track truncated size 89c2b3b749182 io_uring: reexpand under-reexpanded iters
I now see execution tripping the WARN() in iov_iter_revert():
if (WARN_ON(unroll > MAX_RW_COUNT)) return
Am I missing any additional patches required to fix stable/v5.10.y?
Any help would be gratefully received.
Kind regards, Lee
-- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
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