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Diffstat (limited to 'fs/io_uring.c')
-rw-r--r--fs/io_uring.c25
1 files changed, 23 insertions, 2 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 74185cbabc3d..95a450451782 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1188,6 +1188,8 @@ static void __io_req_aux_free(struct io_kiocb *req)
else
fput(req->file);
}
+ if (req->work.creds)
+ put_cred(req->work.creds);
}
static void __io_free_req(struct io_kiocb *req)
@@ -3975,7 +3977,8 @@ static int io_req_defer_prep(struct io_kiocb *req,
mmgrab(current->mm);
req->work.mm = current->mm;
}
- req->work.creds = get_current_cred();
+ if (!req->work.creds)
+ req->work.creds = get_current_cred();
switch (req->opcode) {
case IORING_OP_NOP:
@@ -4605,11 +4608,13 @@ static inline void io_queue_link_head(struct io_kiocb *req)
}
#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \
- IOSQE_IO_HARDLINK | IOSQE_ASYNC)
+ IOSQE_IO_HARDLINK | IOSQE_ASYNC | \
+ IOSQE_PERSONALITY)
static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
struct io_submit_state *state, struct io_kiocb **link)
{
+ const struct cred *old_creds = NULL;
struct io_ring_ctx *ctx = req->ctx;
unsigned int sqe_flags;
int ret;
@@ -4621,6 +4626,18 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
ret = -EINVAL;
goto err_req;
}
+
+ if (sqe_flags & IOSQE_PERSONALITY) {
+ int id = READ_ONCE(sqe->personality);
+
+ req->work.creds = idr_find(&ctx->personality_idr, id);
+ if (unlikely(!req->work.creds)) {
+ ret = -EINVAL;
+ goto err_req;
+ }
+ old_creds = override_creds(req->work.creds);
+ }
+
/* same numerical values with corresponding REQ_F_*, safe to copy */
req->flags |= sqe_flags & (IOSQE_IO_DRAIN|IOSQE_IO_HARDLINK|
IOSQE_ASYNC);
@@ -4630,6 +4647,8 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
err_req:
io_cqring_add_event(req, ret);
io_double_put_req(req);
+ if (old_creds)
+ revert_creds(old_creds);
return false;
}
@@ -4690,6 +4709,8 @@ err_req:
}
}
+ if (old_creds)
+ revert_creds(old_creds);
return true;
}