netdev - [PATCHSET] Fix io_uring async rlimit(RLIMIT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200320022216.20993-1-axboe@kernel.dk>
Date:   Thu, 19 Mar 2020 20:22:14 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     io-uring@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCHSET] Fix io_uring async rlimit(RLIMIT_NOFILE)

If we handle openat/openat2/accept in an async manner, then we need
to ensure that the max open file limit is honored. All of these end
up boiling down to the check in get_unused_fd_flags(), which does
rlimit(RLIMIT_NOFILE), which uses the current->signal->rlim[] limits.

Instead of fiddling with the task ->signal pointer, just allow us to
pass in the correct value as set from the original task at request
prep time.

-- 
Jens Axboe