netdev - Re: [PATCH v4 net 0/3] udp: Fix two integer overflows when sk->sk_rcvbuf is close to INT

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Message-ID: <20250331065109.45dddd0d@kernel.org>
Date: Mon, 31 Mar 2025 06:51:09 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>, "David S. Miller"
 <davem@...emloft.net>, David Ahern <dsahern@...nel.org>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
 <horms@...nel.org>, Kuniyuki Iwashima <kuni1840@...il.com>,
 <netdev@...r.kernel.org>
Subject: Re: [PATCH v4 net 0/3] udp: Fix two integer overflows when
 sk->sk_rcvbuf is close to INT_MAX.

On Sat, 29 Mar 2025 11:05:10 -0700 Kuniyuki Iwashima wrote:
> v4:
>   * Patch 4
>     * Wait RCU for at most 30 sec

The new test still doesn't pass

TAP version 13
1..1
# timeout set to 3600
# selftests: net: so_rcvbuf
# 0.00 [+0.00] TAP version 13
# 0.00 [+0.00] 1..2
# 0.00 [+0.00] # Starting 2 tests from 2 test cases.
# 0.00 [+0.00] #  RUN           so_rcvbuf.udp_ipv4.rmem_max ...
# 0.00 [+0.00] # so_rcvbuf.c:151:rmem_max:Expected pages (35) == 0 (0)
# 0.00 [+0.00] # rmem_max: Test terminated by assertion
# 0.00 [+0.00] #          FAIL  so_rcvbuf.udp_ipv4.rmem_max
# 0.00 [+0.00] not ok 1 so_rcvbuf.udp_ipv4.rmem_max
# 0.01 [+0.00] #  RUN           so_rcvbuf.udp_ipv6.rmem_max ...
# 0.01 [+0.00] # so_rcvbuf.c:151:rmem_max:Expected pages (35) == 0 (0)
# 0.01 [+0.00] # rmem_max: Test terminated by assertion
# 0.01 [+0.00] #          FAIL  so_rcvbuf.udp_ipv6.rmem_max
# 0.01 [+0.00] not ok 2 so_rcvbuf.udp_ipv6.rmem_max
# 0.01 [+0.00] # FAILED: 0 / 2 tests passed.
# 0.01 [+0.00] # Totals: pass:0 fail:2 xfail:0 xpass:0 skip:0 error:0
not ok 1 selftests: net: so_rcvbuf # exit=1

Plus we also see failures in udpgso.sh