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 --- tools/perf/util/config.h | 80 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 tools/perf/util/config.h (limited to 'tools/perf/util/config.h') diff --git a/tools/perf/util/config.h b/tools/perf/util/config.h new file mode 100644 index 000000000..987b47cf5 --- /dev/null +++ b/tools/perf/util/config.h @@ -0,0 +1,80 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __PERF_CONFIG_H +#define __PERF_CONFIG_H + +#include +#include + +struct perf_config_item { + char *name; + char *value; + bool from_system_config; + struct list_head node; +}; + +struct perf_config_section { + char *name; + struct list_head items; + bool from_system_config; + struct list_head node; +}; + +struct perf_config_set { + struct list_head sections; +}; + +extern const char *config_exclusive_filename; + +typedef int (*config_fn_t)(const char *, const char *, void *); + +int perf_default_config(const char *, const char *, void *); +int perf_config(config_fn_t fn, void *); +int perf_config_scan(const char *name, const char *fmt, ...) __scanf(2, 3); +const char *perf_config_get(const char *name); +int perf_config_set(struct perf_config_set *set, + config_fn_t fn, void *data); +int perf_config_int(int *dest, const char *, const char *); +int perf_config_u8(u8 *dest, const char *name, const char *value); +int perf_config_u64(u64 *dest, const char *, const char *); +int perf_config_bool(const char *, const char *); +int config_error_nonbool(const char *); +const char *perf_etc_perfconfig(void); +const char *perf_home_perfconfig(void); +int perf_config_system(void); +int perf_config_global(void); + +struct perf_config_set *perf_config_set__new(void); +struct perf_config_set *perf_config_set__load_file(const char *file); +void perf_config_set__delete(struct perf_config_set *set); +int perf_config_set__collect(struct perf_config_set *set, const char *file_name, + const char *var, const char *value); +void perf_config__exit(void); +int perf_config__set_variable(const char *var, const char *value); + +/** + * perf_config_sections__for_each - iterate thru all the sections + * @list: list_head instance to iterate + * @section: struct perf_config_section iterator + */ +#define perf_config_sections__for_each_entry(list, section) \ + list_for_each_entry(section, list, node) + +/** + * perf_config_items__for_each - iterate thru all the items + * @list: list_head instance to iterate + * @item: struct perf_config_item iterator + */ +#define perf_config_items__for_each_entry(list, item) \ + list_for_each_entry(item, list, node) + +/** + * perf_config_set__for_each - iterate thru all the config section-item pairs + * @set: evlist instance to iterate + * @section: struct perf_config_section iterator + * @item: struct perf_config_item iterator + */ +#define perf_config_set__for_each_entry(set, section, item) \ + perf_config_sections__for_each_entry(&set->sections, section) \ + perf_config_items__for_each_entry(§ion->items, item) + +#endif /* __PERF_CONFIG_H */ -- cgit v1.3.1