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rxrpc: Improve setsockopt() handling of malformed user input

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BugLink: https://bugs.launchpad.net/bugs/2101915

[ Upstream commit 02020056647017e70509bb58c3096448117099e1 ]

copy_from_sockptr() does not return negative value on error; instead, it
reports the number of bytes that failed to copy. Since it's deprecated,
switch to copy_safe_from_sockptr().

Note: Keeping the `optlen != sizeof(unsigned int)` check as
copy_safe_from_sockptr() by itself would also accept
optlen > sizeof(unsigned int). Which would allow a more lenient handling
of inputs.

Fixes: 17926a7932 ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both")
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Michal Luczaj
2025-03-11 08:51:19 +09:00
committed by Stefan Bader
parent 90b5024e77
commit ea9a859fd1
1 changed files with 4 additions and 3 deletions
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net/rxrpc/af_rxrpc.c
+4 -3
View File
@@ -707,9 +707,10 @@ static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
ret = -EISCONN;
if (rx->sk.sk_state != RXRPC_UNBOUND)
goto error;
ret = copy_from_sockptr(&min_sec_level, optval,
sizeof(unsigned int));
if (ret < 0)
ret = copy_safe_from_sockptr(&min_sec_level,
sizeof(min_sec_level),
optval, optlen);
if (ret)
goto error;
ret = -EINVAL;
if (min_sec_level > RXRPC_SECURITY_MAX)