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Date: Thu, 13 Oct 2022 07:15:52 +0200
From: Stefano Brivio <sbrivio@redhat.com>
To: David Gibson <david@gibson.dropbear.id.au>
Subject: Re: Alas for CAP_NET_BIND_SERVICE
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On Thu, 13 Oct 2022 06:54:26 +0200
Stefano Brivio <sbrivio@redhat.com> wrote:
> Anyway, I drafted it... but this happens. I dropped pasta symlinks for
> simplicity:
>
> --
>
> # setcap 'cap_net_bind_service=+ep' /home/sbrivio/passt/pasta.avx2
> # getcap /home/sbrivio/passt/pasta.avx2
> /home/sbrivio/passt/pasta.avx2 cap_net_bind_service=ep
>
> --
>
> $ strace -ebind,capget,capset,readlink -f ./pasta.avx2 -f -t 81 1763943
> readlink("/proc/self/exe", "/home/sbrivio/passt/pasta.avx2", 4095) = 30
> capget({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, {effective=0, permitted=0, inheritable=0}) = 0
> capset({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, {effective=0, permitted=0, inheritable=0}) = 0
> bind(5, {sa_family=AF_INET, sin_port=htons(81), sin_addr=inet_addr("0.0.0.0")}, 16) = -1 EACCES (Permission denied)
> bind(5, {sa_family=AF_INET, sin_port=htons(81), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 EACCES (Permission denied)
> bind(5, {sa_family=AF_INET6, sin6_port=htons(81), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::", &sin6_addr), sin6_scope_id=0}, 28) = -1 EACCES (Permission denied)
> bind(5, {sa_family=AF_INET6, sin6_port=htons(81), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_scope_id=0}, 28) = -1 EACCES (Permission denied)
>
> --
>
> no fancy filesystem attributes, just a very unassuming ext4. I must be
> missing something very obvious.
...oops, never mind, it's strace, of course -- that's even mentioned in
man 7 capabilities.
--
Stefano