On Thu, 22 Oct 2020 09:48:48 +0200 Eric Dumazet wrote:
> On Thu, Oct 22, 2020 at 8:42 AM Ke Li <k...@akamai.com> wrote:
> >
> > In setsockopt(SO_MAX_PACING_RATE) on 64bit systems, sk_max_pacing_rate,
> > after extended from 'u32' to 'unsigned long', takes unintentionally
> > hiked value whenever assigned from an 'int' value with MSB=1, due to
> > binary sign extension in promoting s32 to u64, e.g. 0x80000000 becomes
> > 0xFFFFFFFF80000000.
> >
> > Thus inflated sk_max_pacing_rate causes subsequent getsockopt to return
> > ~0U unexpectedly. It may also result in increased pacing rate.
> >
> > Fix by explicitly casting the 'int' value to 'unsigned int' before
> > assigning it to sk_max_pacing_rate, for zero extension to happen.
> >
> > Fixes: 76a9ebe811fb ("net: extend sk_pacing_rate to unsigned long")
> > Signed-off-by: Ji Li <j...@akamai.com>
> > Signed-off-by: Ke Li <k...@akamai.com>
> > Cc: Eric Dumazet <eduma...@google.com>
> > ---
> > v2: wrap the line in net/core/filter.c to less than 80 chars.
>
> SGTM (the other version was also fine, the 80 chars rule has been
> relaxed/changed to 100 recently)
We went from old guidelines, to unclear guidelines, IDK which one is
worse :( Here the way the ternary expression was wrapping in a 80 char
window looked way less readable, so I thought I'd request a reformat.
> Reviewed-by: Eric Dumazet <eduma...@google.com>
Applied, thanks everyone!
