diff options
| -rw-r--r-- | drivers/infiniband/core/user_mad.c | 49 | ||||
| -rw-r--r-- | include/rdma/ib_user_mad.h | 22 |
2 files changed, 61 insertions, 10 deletions
diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c index aee29139368c..b53eac4611de 100644 --- a/drivers/infiniband/core/user_mad.c +++ b/drivers/infiniband/core/user_mad.c @@ -44,6 +44,7 @@ #include <linux/poll.h> #include <linux/rwsem.h> #include <linux/kref.h> +#include <linux/compat.h> #include <asm/uaccess.h> #include <asm/semaphore.h> @@ -607,7 +608,8 @@ static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wa return mask; } -static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg) +static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg, + int compat_method_mask) { struct ib_user_mad_reg_req ureq; struct ib_mad_reg_req req; @@ -622,7 +624,7 @@ static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg) goto out; } - if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) { + if (copy_from_user(&ureq, arg, sizeof ureq)) { ret = -EFAULT; goto out; } @@ -643,8 +645,18 @@ found: if (ureq.mgmt_class) { req.mgmt_class = ureq.mgmt_class; req.mgmt_class_version = ureq.mgmt_class_version; - memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask); - memcpy(req.oui, ureq.oui, sizeof req.oui); + memcpy(req.oui, ureq.oui, sizeof req.oui); + + if (compat_method_mask) { + u32 *umm = (u32 *) ureq.method_mask; + int i; + + for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i) + req.method_mask[i] = + umm[i * 2] | ((u64) umm[i * 2 + 1] << 32); + } else + memcpy(req.method_mask, ureq.method_mask, + sizeof req.method_mask); } agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, @@ -682,13 +694,13 @@ out: return ret; } -static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg) +static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg) { struct ib_mad_agent *agent = NULL; u32 id; int ret = 0; - if (get_user(id, (u32 __user *) arg)) + if (get_user(id, arg)) return -EFAULT; down_write(&file->port->mutex); @@ -729,9 +741,9 @@ static long ib_umad_ioctl(struct file *filp, unsigned int cmd, { switch (cmd) { case IB_USER_MAD_REGISTER_AGENT: - return ib_umad_reg_agent(filp->private_data, arg); + return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0); case IB_USER_MAD_UNREGISTER_AGENT: - return ib_umad_unreg_agent(filp->private_data, arg); + return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg); case IB_USER_MAD_ENABLE_PKEY: return ib_umad_enable_pkey(filp->private_data); default: @@ -739,6 +751,23 @@ static long ib_umad_ioctl(struct file *filp, unsigned int cmd, } } +#ifdef CONFIG_COMPAT +static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + switch (cmd) { + case IB_USER_MAD_REGISTER_AGENT: + return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1); + case IB_USER_MAD_UNREGISTER_AGENT: + return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg)); + case IB_USER_MAD_ENABLE_PKEY: + return ib_umad_enable_pkey(filp->private_data); + default: + return -ENOIOCTLCMD; + } +} +#endif + static int ib_umad_open(struct inode *inode, struct file *filp) { struct ib_umad_port *port; @@ -826,7 +855,9 @@ static const struct file_operations umad_fops = { .write = ib_umad_write, .poll = ib_umad_poll, .unlocked_ioctl = ib_umad_ioctl, - .compat_ioctl = ib_umad_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = ib_umad_compat_ioctl, +#endif .open = ib_umad_open, .release = ib_umad_close }; diff --git a/include/rdma/ib_user_mad.h b/include/rdma/ib_user_mad.h index 2a32043d1abd..29d2c7205a90 100644 --- a/include/rdma/ib_user_mad.h +++ b/include/rdma/ib_user_mad.h @@ -147,6 +147,26 @@ struct ib_user_mad { __u64 data[0]; }; +/* + * Earlier versions of this interface definition declared the + * method_mask[] member as an array of __u32 but treated it as a + * bitmap made up of longs in the kernel. This ambiguity meant that + * 32-bit big-endian applications that can run on both 32-bit and + * 64-bit kernels had no consistent ABI to rely on, and 64-bit + * big-endian applications that treated method_mask as being made up + * of 32-bit words would have their bitmap misinterpreted. + * + * To clear up this confusion, we change the declaration of + * method_mask[] to use unsigned long and handle the conversion from + * 32-bit userspace to 64-bit kernel for big-endian systems in the + * compat_ioctl method. Unfortunately, to keep the structure layout + * the same, we need the method_mask[] array to be aligned only to 4 + * bytes even when long is 64 bits, which forces us into this ugly + * typedef. + */ +typedef unsigned long __attribute__((aligned(4))) packed_ulong; +#define IB_USER_MAD_LONGS_PER_METHOD_MASK (128 / (8 * sizeof (long))) + /** * ib_user_mad_reg_req - MAD registration request * @id - Set by the kernel; used to identify agent in future requests. @@ -165,7 +185,7 @@ struct ib_user_mad { */ struct ib_user_mad_reg_req { __u32 id; - __u32 method_mask[4]; + packed_ulong method_mask[IB_USER_MAD_LONGS_PER_METHOD_MASK]; __u8 qpn; __u8 mgmt_class; __u8 mgmt_class_version; |