From 78004e9a87f240df03e2f73120d291763c32e0a7 Mon Sep 17 00:00:00 2001 From: Ali Ahmet Memis Date: Fri, 21 Aug 2026 01:45:27 +0000 Subject: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style] Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Cc: stable@vger.kernel.org Signed-off-by: Ali Ahmet Memis Signed-off-by: Stafford Horne --- net/ieee802154/sysfs.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 net/ieee802154/sysfs.c (limited to 'net/ieee802154/sysfs.c') diff --git a/net/ieee802154/sysfs.c b/net/ieee802154/sysfs.c new file mode 100644 index 000000000..6708160eb --- /dev/null +++ b/net/ieee802154/sysfs.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * + * Authors: + * Alexander Aring + * + * Based on: net/wireless/sysfs.c + */ + +#include +#include + +#include + +#include "core.h" +#include "sysfs.h" +#include "rdev-ops.h" + +static inline struct cfg802154_registered_device * +dev_to_rdev(struct device *dev) +{ + return container_of(dev, struct cfg802154_registered_device, + wpan_phy.dev); +} + +#define SHOW_FMT(name, fmt, member) \ +static ssize_t name ## _show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + return sprintf(buf, fmt "\n", dev_to_rdev(dev)->member); \ +} \ +static DEVICE_ATTR_RO(name) + +SHOW_FMT(index, "%d", wpan_phy_idx); + +static ssize_t name_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct wpan_phy *wpan_phy = &dev_to_rdev(dev)->wpan_phy; + + return sprintf(buf, "%s\n", dev_name(&wpan_phy->dev)); +} +static DEVICE_ATTR_RO(name); + +static void wpan_phy_release(struct device *dev) +{ + struct cfg802154_registered_device *rdev = dev_to_rdev(dev); + + cfg802154_dev_free(rdev); +} + +static struct attribute *pmib_attrs[] = { + &dev_attr_index.attr, + &dev_attr_name.attr, + NULL, +}; +ATTRIBUTE_GROUPS(pmib); + +#ifdef CONFIG_PM_SLEEP +static int wpan_phy_suspend(struct device *dev) +{ + struct cfg802154_registered_device *rdev = dev_to_rdev(dev); + int ret = 0; + + if (rdev->ops->suspend) { + rtnl_lock(); + ret = rdev_suspend(rdev); + rtnl_unlock(); + } + + return ret; +} + +static int wpan_phy_resume(struct device *dev) +{ + struct cfg802154_registered_device *rdev = dev_to_rdev(dev); + int ret = 0; + + if (rdev->ops->resume) { + rtnl_lock(); + ret = rdev_resume(rdev); + rtnl_unlock(); + } + + return ret; +} + +static SIMPLE_DEV_PM_OPS(wpan_phy_pm_ops, wpan_phy_suspend, wpan_phy_resume); +#define WPAN_PHY_PM_OPS (&wpan_phy_pm_ops) +#else +#define WPAN_PHY_PM_OPS NULL +#endif + +const struct class wpan_phy_class = { + .name = "ieee802154", + .dev_release = wpan_phy_release, + .dev_groups = pmib_groups, + .pm = WPAN_PHY_PM_OPS, +}; + +int wpan_phy_sysfs_init(void) +{ + return class_register(&wpan_phy_class); +} + +void wpan_phy_sysfs_exit(void) +{ + class_unregister(&wpan_phy_class); +} -- cgit v1.3.1