netdev - [PATCH net 0/4] net: Fix some callers of copy_from

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <20241115-sockptr-copy-fixes-v1-0-d183c87fcbd5@rbox.co>
Date: Fri, 15 Nov 2024 00:27:23 +0100
From: Michal Luczaj <mhal@...x.co>
To: Marcel Holtmann <marcel@...tmann.org>, 
 Johan Hedberg <johan.hedberg@...il.com>, 
 Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 David Howells <dhowells@...hat.com>, Marc Dionne <marc.dionne@...istor.com>
Cc: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>, 
 linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org, 
 linux-afs@...ts.infradead.org, Jakub Kicinski <kuba@...nel.org>, 
 Michal Luczaj <mhal@...x.co>
Subject: [PATCH net 0/4] net: Fix some callers of copy_from_sockptr()

Some callers misinterpret copy_from_sockptr()'s return value. The function
follows copy_from_user(), i.e. returns 0 for success, or the number of
bytes not copied on error. Simply returning the result in a non-zero case
isn't usually what was intended.

Compile tested with CONFIG_LLC, CONFIG_AF_RXRPC, CONFIG_BT enabled.

Last patch probably belongs more to net-next, if any. Here as a RFC.

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Michal Luczaj <mhal@...x.co>
---
Michal Luczaj (4):
      bluetooth: Improve setsockopt() handling of malformed user input
      llc: Improve setsockopt() handling of malformed user input
      rxrpc: Improve setsockopt() handling of malformed user input
      net: Comment copy_from_sockptr() explaining its behaviour

 include/linux/sockptr.h           |  2 ++
 include/net/bluetooth/bluetooth.h |  9 ---------
 net/bluetooth/hci_sock.c          | 14 +++++++-------
 net/bluetooth/iso.c               | 10 +++++-----
 net/bluetooth/l2cap_sock.c        | 20 +++++++++++---------
 net/bluetooth/rfcomm/sock.c       |  9 ++++-----
 net/bluetooth/sco.c               | 11 ++++++-----
 net/llc/af_llc.c                  | 15 ++++++++-------
 net/rxrpc/af_rxrpc.c              |  8 ++++----
 9 files changed, 47 insertions(+), 51 deletions(-)
---
base-commit: cfaaa7d010d1fc58f9717fcc8591201e741d2d49
change-id: 20241114-sockptr-copy-fixes-3999eaa81aa1

Best regards,
-- 
Michal Luczaj <mhal@...x.co>