[nsd-users] SIGSEGV in rbtree_find_less_equal

[Jeroen Koekkoek]

Hi Chris,

I'm having trouble trying to reproduce the issue locally.

Like you I configure two zones.

zone:
  name: example.com.
  zonefile: example.com.zone.signed

zone:
  name: bar.example.com.
  zonefile: bar.example.com.zone

The file bar.example.com.zone does not exist. After touching and
reloading the signed zone, no segfault occurs. I've tried with and
without the "--disable-radix-tree" configure option (as the error
occurs in the rbtree). I've also tried with example.com. being an NSEC
and NSEC3 zone.

Can you provide some more details?

Best regards,
Jeroen




On Wed, 2024-10-02 at 14:57 +0000, Chris LaVallee via nsd-users wrote:
> 
> Hi,
> 
> 
> I found a reproducible seg fault with a DNSSEC signed zone and
> overlapping config. I'm running NSD 4.10.1. Here's how to reproduce.
> 
> 
> 2 zones in nsd.conf:
> 
> 
> zone:
>         name:     "foo.com."
>         zonefile:     "/zones/foo.com.zone.signed"
> 
> 
> zone:
>         name:     "bar.foo.com."
>         zonefile: "/zones/bar.foo.com.zone"
> 
> 
> 
> 
> Zone files:
> 
> 
> foo.com.zone.signed is DNSSEC signed with a record for a.bar (A
> record or anything)
> bar.foo.com.zone doesn't exist  (but it's in nsd.conf shown above)
> 
> 
> 
> 
> Steps:
> 1) Startup NSD
> 2) touch foo.com.zone.signed
> 3) reload NSD
> 
> 
> 
> 
> nsd.log will say:
> [2024-10-02 07:19:58.691] nsd[962739]: info: control cmd:  reload
> [2024-10-02 07:19:58.845] nsd[962752]: error: handle_reload_cmd:
> reload closed cmd channel
> [2024-10-02 07:19:58.845] nsd[962752]: warning: Reload process 962740
> failed, continuing with old database
> 
> 
> core dump says SIGSEGV in rbtree_find_less_equal
> 
> 
> 
> 
> Chris LaVallee
> Edgio (formally EdgeCast Networks)
> 
> 
> 
> 
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