From 33a154a96e71a34a1bcca9f40da343dbbf7b38b4 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 1 Oct 2026 14:52:55 +0000 Subject: selftests/bpf: Test packet range of pointers sharing an id Add tests where two packet pointers share an id and tightening one pointer's umax from its var_off would put it less than their constant distance from the other's umax: with an index & 0x38 capped at 50, the base pointer keeps umax 50, so the pointer 8 bytes further on must keep umax 58, even though its known bits allow at most 56. These refused a valid program or accepted an out-of-bounds access before the fix: - check the advanced copy, load through the base: valid, was refused; - check the base, load the byte at base + 1 through a copy advanced by 8: was accepted; - check base + 4, load 4 bytes at base + 2 through base + 8: reads two bytes past the checked range, was accepted; - the same as the second with data_meta pointers checked against data: was accepted. These pass with and without the fix and cover nearby paths: - subtract an unknown scalar from a checked pointer and load below it (the range is kept across a new id); - reach a load through two paths whose checks cover 8 and 7 bytes after the loaded pointer; the second path must not be pruned by the first; - spill a copy of a pointer, check the pointer, fill the copy and load one byte past the checked range: the load is refused, and the copy has the range of the check. Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20261001145255.855630-2-alexei.starovoitov@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- drivers/dio/dio-sysfs.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 drivers/dio/dio-sysfs.c (limited to 'drivers/dio/dio-sysfs.c') diff --git a/drivers/dio/dio-sysfs.c b/drivers/dio/dio-sysfs.c new file mode 100644 index 000000000..ee1a3b59b --- /dev/null +++ b/drivers/dio/dio-sysfs.c @@ -0,0 +1,82 @@ +/* + * File Attributes for DIO Devices + * + * Copyright (C) 2004 Jochen Friedrich + * + * Loosely based on drivers/pci/pci-sysfs.c and drivers/zorro/zorro-sysfs.c + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + + +#include +#include +#include + +/* show configuration fields */ + +static ssize_t dio_show_id(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dio_dev *d; + + d = to_dio_dev(dev); + return sprintf(buf, "0x%02x\n", (d->id & 0xff)); +} +static DEVICE_ATTR(id, S_IRUGO, dio_show_id, NULL); + +static ssize_t dio_show_ipl(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dio_dev *d; + + d = to_dio_dev(dev); + return sprintf(buf, "0x%02x\n", d->ipl); +} +static DEVICE_ATTR(ipl, S_IRUGO, dio_show_ipl, NULL); + +static ssize_t dio_show_secid(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dio_dev *d; + + d = to_dio_dev(dev); + return sprintf(buf, "0x%02x\n", ((d->id >> 8)& 0xff)); +} +static DEVICE_ATTR(secid, S_IRUGO, dio_show_secid, NULL); + +static ssize_t dio_show_name(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dio_dev *d; + + d = to_dio_dev(dev); + return sprintf(buf, "%s\n", d->name); +} +static DEVICE_ATTR(name, S_IRUGO, dio_show_name, NULL); + +static ssize_t dio_show_resource(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dio_dev *d = to_dio_dev(dev); + + return sprintf(buf, "0x%08lx 0x%08lx 0x%08lx\n", + (unsigned long)dio_resource_start(d), + (unsigned long)dio_resource_end(d), + dio_resource_flags(d)); +} +static DEVICE_ATTR(resource, S_IRUGO, dio_show_resource, NULL); + +int dio_create_sysfs_dev_files(struct dio_dev *d) +{ + struct device *dev = &d->dev; + int error; + + /* current configuration's attributes */ + if ((error = device_create_file(dev, &dev_attr_id)) || + (error = device_create_file(dev, &dev_attr_ipl)) || + (error = device_create_file(dev, &dev_attr_secid)) || + (error = device_create_file(dev, &dev_attr_name)) || + (error = device_create_file(dev, &dev_attr_resource))) + return error; + + return 0; +} + -- cgit v1.3.1