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/bench/bench.h | 75 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 tools/perf/bench/bench.h (limited to 'tools/perf/bench/bench.h') diff --git a/tools/perf/bench/bench.h b/tools/perf/bench/bench.h new file mode 100644 index 000000000..8519eb5a4 --- /dev/null +++ b/tools/perf/bench/bench.h @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef BENCH_H +#define BENCH_H + +#include + +extern struct timeval bench__start, bench__end, bench__runtime; + +/* + * The madvise transparent hugepage constants were added in glibc + * 2.13. For compatibility with older versions of glibc, define these + * tokens if they are not already defined. + */ +# ifndef MADV_HUGEPAGE +# define MADV_HUGEPAGE 14 +# endif +# ifndef MADV_NOHUGEPAGE +# define MADV_NOHUGEPAGE 15 +# endif + +int bench_numa(int argc, const char **argv); +int bench_sched_messaging(int argc, const char **argv); +int bench_sched_pipe(int argc, const char **argv); +int bench_sched_seccomp_notify(int argc, const char **argv); +int bench_syscall_basic(int argc, const char **argv); +int bench_syscall_getpgid(int argc, const char **argv); +int bench_syscall_fork(int argc, const char **argv); +int bench_syscall_execve(int argc, const char **argv); +int bench_mem_memcpy(int argc, const char **argv); +int bench_mem_memset(int argc, const char **argv); +int bench_mem_mmap(int argc, const char **argv); +int bench_mem_find_bit(int argc, const char **argv); +int bench_futex_hash(int argc, const char **argv); +int bench_futex_wake(int argc, const char **argv); +int bench_futex_wake_parallel(int argc, const char **argv); +int bench_futex_requeue(int argc, const char **argv); +/* pi futexes */ +int bench_futex_lock_pi(int argc, const char **argv); +int bench_epoll_wait(int argc, const char **argv); +int bench_epoll_ctl(int argc, const char **argv); +int bench_synthesize(int argc, const char **argv); +int bench_kallsyms_parse(int argc, const char **argv); +int bench_inject_build_id(int argc, const char **argv); +int bench_evlist_open_close(int argc, const char **argv); +int bench_breakpoint_thread(int argc, const char **argv); +int bench_breakpoint_enable(int argc, const char **argv); +int bench_uprobe_baseline(int argc, const char **argv); +int bench_uprobe_empty(int argc, const char **argv); +int bench_uprobe_trace_printk(int argc, const char **argv); +int bench_uprobe_empty_ret(int argc, const char **argv); +int bench_uprobe_trace_printk_ret(int argc, const char **argv); +int bench_pmu_scan(int argc, const char **argv); + +#define BENCH_FORMAT_DEFAULT_STR "default" +#define BENCH_FORMAT_DEFAULT 0 +#define BENCH_FORMAT_SIMPLE_STR "simple" +#define BENCH_FORMAT_SIMPLE 1 + +#define BENCH_FORMAT_UNKNOWN -1 + +extern int bench_format; +extern unsigned int bench_repeat; + +#ifndef HAVE_PTHREAD_ATTR_SETAFFINITY_NP +#include +#include +static inline int pthread_attr_setaffinity_np(pthread_attr_t *attr __maybe_unused, + size_t cpusetsize __maybe_unused, + cpu_set_t *cpuset __maybe_unused) +{ + return 0; +} +#endif + +#endif -- cgit v1.3.1