summaryrefslogtreecommitdiff
path: root/io_uring/opdef.c
diff options
context:
space:
mode:
authorPaul Moore <paul@paul-moore.com>2024-01-23 16:55:02 -0500
committerJens Axboe <axboe@kernel.dk>2024-01-23 15:25:14 -0700
commit16bae3e1377846734ec6b87eee459c0f3551692c (patch)
tree52972c02d261202cdf3676afdd00d00002f7dfa7 /io_uring/opdef.c
parent6613476e225e090cc9aad49be7fa504e290dd33d (diff)
io_uring: enable audit and restrict cred override for IORING_OP_FIXED_FD_INSTALL
We need to correct some aspects of the IORING_OP_FIXED_FD_INSTALL command to take into account the security implications of making an io_uring-private file descriptor generally accessible to a userspace task. The first change in this patch is to enable auditing of the FD_INSTALL operation as installing a file descriptor into a task's file descriptor table is a security relevant operation and something that admins/users may want to audit. The second change is to disable the io_uring credential override functionality, also known as io_uring "personalities", in the FD_INSTALL command. The credential override in FD_INSTALL is particularly problematic as it affects the credentials used in the security_file_receive() LSM hook. If a task were to request a credential override via REQ_F_CREDS on a FD_INSTALL operation, the LSM would incorrectly check to see if the overridden credentials of the io_uring were able to "receive" the file as opposed to the task's credentials. After discussions upstream, it's difficult to imagine a use case where we would want to allow a credential override on a FD_INSTALL operation so we are simply going to block REQ_F_CREDS on IORING_OP_FIXED_FD_INSTALL operations. Fixes: dc18b89ab113 ("io_uring/openclose: add support for IORING_OP_FIXED_FD_INSTALL") Signed-off-by: Paul Moore <paul@paul-moore.com> Link: https://lore.kernel.org/r/20240123215501.289566-2-paul@paul-moore.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/opdef.c')
-rw-r--r--io_uring/opdef.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/io_uring/opdef.c b/io_uring/opdef.c
index 6705634e5f52..b1ee3a9c3807 100644
--- a/io_uring/opdef.c
+++ b/io_uring/opdef.c
@@ -471,7 +471,6 @@ const struct io_issue_def io_issue_defs[] = {
},
[IORING_OP_FIXED_FD_INSTALL] = {
.needs_file = 1,
- .audit_skip = 1,
.prep = io_install_fixed_fd_prep,
.issue = io_install_fixed_fd,
},