mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 08:49:45 +00:00
RDMA/ucma: Fix uABI structure layouts for 32/64 compat
The rdma_ucm_event_resp is a different length on 32 and 64 bit compiles. The kernel requires it to be the expected length or longer so 32 bit builds running on a 64 bit kernel will not work. Retain full compat by having all kernels accept a struct with or without the trailing reserved field. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
parent
38b48808b9
commit
611cb92b08
2 changed files with 12 additions and 2 deletions
|
@ -382,7 +382,11 @@ static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
|
|||
struct ucma_event *uevent;
|
||||
int ret = 0;
|
||||
|
||||
if (out_len < sizeof uevent->resp)
|
||||
/*
|
||||
* Old 32 bit user space does not send the 4 byte padding in the
|
||||
* reserved field. We don't care, allow it to keep working.
|
||||
*/
|
||||
if (out_len < sizeof(uevent->resp) - sizeof(uevent->resp.reserved))
|
||||
return -ENOSPC;
|
||||
|
||||
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
|
||||
|
@ -417,7 +421,8 @@ static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
|
|||
}
|
||||
|
||||
if (copy_to_user((void __user *)(unsigned long)cmd.response,
|
||||
&uevent->resp, sizeof uevent->resp)) {
|
||||
&uevent->resp,
|
||||
min_t(size_t, out_len, sizeof(uevent->resp)))) {
|
||||
ret = -EFAULT;
|
||||
goto done;
|
||||
}
|
||||
|
|
|
@ -270,10 +270,15 @@ struct rdma_ucm_event_resp {
|
|||
__u32 id;
|
||||
__u32 event;
|
||||
__u32 status;
|
||||
/*
|
||||
* NOTE: This union is not aligned to 8 bytes so none of the union
|
||||
* members may contain a u64 or anything with higher alignment than 4.
|
||||
*/
|
||||
union {
|
||||
struct rdma_ucm_conn_param conn;
|
||||
struct rdma_ucm_ud_param ud;
|
||||
} param;
|
||||
__u32 reserved;
|
||||
};
|
||||
|
||||
/* Option levels */
|
||||
|
|
Loading…
Reference in a new issue