[net,v2] net: fman: Use physical address for userspace interfaces
Commit Message
Before 262f2b782e25 ("net: fman: Map the base address once"), the
physical address of the MAC was exposed to userspace in two places: via
sysfs and via SIOCGIFMAP. While this is not best practice, it is an
external ABI which is in use by userspace software.
The aforementioned commit inadvertently modified these addresses and
made them virtual. This constitutes and ABI break. Additionally, it
leaks the kernel's memory layout to userspace. Partially revert that
commit, reintroducing the resource back into struct mac_device, while
keeping the intended changes (the rework of the address mapping).
Fixes: 262f2b782e25 ("net: fman: Map the base address once")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Acked-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
---
Changes in v2:
- Expand and clarify commit message
drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 4 ++--
drivers/net/ethernet/freescale/dpaa/dpaa_eth_sysfs.c | 2 +-
drivers/net/ethernet/freescale/fman/mac.c | 12 ++++++------
drivers/net/ethernet/freescale/fman/mac.h | 2 +-
4 files changed, 10 insertions(+), 10 deletions(-)
Comments
Hello:
This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:
On Thu, 20 Oct 2022 11:50:41 -0400 you wrote:
> Before 262f2b782e25 ("net: fman: Map the base address once"), the
> physical address of the MAC was exposed to userspace in two places: via
> sysfs and via SIOCGIFMAP. While this is not best practice, it is an
> external ABI which is in use by userspace software.
>
> The aforementioned commit inadvertently modified these addresses and
> made them virtual. This constitutes and ABI break. Additionally, it
> leaks the kernel's memory layout to userspace. Partially revert that
> commit, reintroducing the resource back into struct mac_device, while
> keeping the intended changes (the rework of the address mapping).
>
> [...]
Here is the summary with links:
- [net,v2] net: fman: Use physical address for userspace interfaces
https://git.kernel.org/netdev/net/c/c99f0f7e6837
You are awesome, thank you!
@@ -221,8 +221,8 @@ static int dpaa_netdev_init(struct net_device *net_dev,
net_dev->netdev_ops = dpaa_ops;
mac_addr = mac_dev->addr;
- net_dev->mem_start = (unsigned long)mac_dev->vaddr;
- net_dev->mem_end = (unsigned long)mac_dev->vaddr_end;
+ net_dev->mem_start = (unsigned long)priv->mac_dev->res->start;
+ net_dev->mem_end = (unsigned long)priv->mac_dev->res->end;
net_dev->min_mtu = ETH_MIN_MTU;
net_dev->max_mtu = dpaa_get_max_mtu();
@@ -18,7 +18,7 @@ static ssize_t dpaa_eth_show_addr(struct device *dev,
if (mac_dev)
return sprintf(buf, "%llx",
- (unsigned long long)mac_dev->vaddr);
+ (unsigned long long)mac_dev->res->start);
else
return sprintf(buf, "none");
}
@@ -279,7 +279,6 @@ static int mac_probe(struct platform_device *_of_dev)
struct device_node *mac_node, *dev_node;
struct mac_device *mac_dev;
struct platform_device *of_dev;
- struct resource *res;
struct mac_priv_s *priv;
struct fman_mac_params params;
u32 val;
@@ -338,24 +337,25 @@ static int mac_probe(struct platform_device *_of_dev)
of_node_put(dev_node);
/* Get the address of the memory mapped registers */
- res = platform_get_mem_or_io(_of_dev, 0);
- if (!res) {
+ mac_dev->res = platform_get_mem_or_io(_of_dev, 0);
+ if (!mac_dev->res) {
dev_err(dev, "could not get registers\n");
return -EINVAL;
}
- err = devm_request_resource(dev, fman_get_mem_region(priv->fman), res);
+ err = devm_request_resource(dev, fman_get_mem_region(priv->fman),
+ mac_dev->res);
if (err) {
dev_err_probe(dev, err, "could not request resource\n");
return err;
}
- mac_dev->vaddr = devm_ioremap(dev, res->start, resource_size(res));
+ mac_dev->vaddr = devm_ioremap(dev, mac_dev->res->start,
+ resource_size(mac_dev->res));
if (!mac_dev->vaddr) {
dev_err(dev, "devm_ioremap() failed\n");
return -EIO;
}
- mac_dev->vaddr_end = mac_dev->vaddr + resource_size(res);
if (!of_device_is_available(mac_node))
return -ENODEV;
@@ -20,8 +20,8 @@ struct mac_priv_s;
struct mac_device {
void __iomem *vaddr;
- void __iomem *vaddr_end;
struct device *dev;
+ struct resource *res;
u8 addr[ETH_ALEN];
struct fman_port *port[2];
u32 if_support;