bug#64229: b2sum: heap-overflow in digest_check

[Pádraig Brady]

On 22/06/2023 17:33, Frank Busse wrote:
> Hi,
>
>
> KLEE reported a heap-overflow in b2sum (Coreutils 9.3). When running it
> with:
>
> $ printf '\n\n0A0BA0' | coreutils-9.3/bin/b2sum -c
>
> (even '0BA0' seems to work on my machine) ASAN confirms the issue:
>
> > #1  0x0000000000473de0 in __interceptor_strchr (s=<optimized out>, c=<optimized 
> > out>)
> > #2  0x0000000000500a81 in digest_check (checkfile_name=0x7fffffffe69e "stdin") 
> > at /tmp/src/coreutils-9.3/src/digest.c:1216
> > #3  0x00000000005005e9 in main (argc=3, argv=0x7fffffffe3a8) at 
> > /tmp/src/coreutils-9.3/src/digest.c:1607

Nice one.
I'll push the attached later to fix this.

Marking this as done.

thanks,
Pádraig.

b2sum-uar-fix.patch
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