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/comm.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 tools/perf/util/comm.h (limited to 'tools/perf/util/comm.h') diff --git a/tools/perf/util/comm.h b/tools/perf/util/comm.h new file mode 100644 index 000000000..f35d8fbfa --- /dev/null +++ b/tools/perf/util/comm.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __PERF_COMM_H +#define __PERF_COMM_H + +#include +#include +#include + +struct comm_str; + +struct comm { + struct comm_str *comm_str; + u64 start; + struct list_head list; + bool exec; + union { /* Tool specific area */ + void *priv; + u64 db_id; + }; +}; + +void comm__free(struct comm *comm); +struct comm *comm__new(const char *str, u64 timestamp, bool exec); +const char *comm__str(const struct comm *comm); +int comm__override(struct comm *comm, const char *str, u64 timestamp, + bool exec); + +#endif /* __PERF_COMM_H */ -- cgit v1.3.1