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/namespaces.h | 84 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 tools/perf/util/namespaces.h (limited to 'tools/perf/util/namespaces.h') diff --git a/tools/perf/util/namespaces.h b/tools/perf/util/namespaces.h new file mode 100644 index 000000000..e95c79b80 --- /dev/null +++ b/tools/perf/util/namespaces.h @@ -0,0 +1,84 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * + * Copyright (C) 2017 Hari Bathini, IBM Corporation + */ + +#ifndef __PERF_NAMESPACES_H +#define __PERF_NAMESPACES_H + +#include +#include +#include +#include +#include +#include +#include + +#ifndef HAVE_SETNS_SUPPORT +int setns(int fd, int nstype); +#endif + +struct perf_record_namespaces; + +struct namespaces { + struct list_head list; + u64 end_time; + struct perf_ns_link_info link_info[]; +}; + +struct namespaces *namespaces__new(struct perf_record_namespaces *event); +void namespaces__free(struct namespaces *namespaces); + +DECLARE_RC_STRUCT(nsinfo) { + pid_t pid; + pid_t tgid; + pid_t nstgid; + bool need_setns; + bool in_pidns; + char *mntns_path; + refcount_t refcnt; +}; + +struct nscookie { + int oldns; + int newns; + char *oldcwd; +}; + +int nsinfo__init(struct nsinfo *nsi); +struct nsinfo *nsinfo__new(pid_t pid); +struct nsinfo *nsinfo__copy(const struct nsinfo *nsi); + +struct nsinfo *nsinfo__get(struct nsinfo *nsi); +void nsinfo__put(struct nsinfo *nsi); + +bool nsinfo__need_setns(const struct nsinfo *nsi); +void nsinfo__clear_need_setns(struct nsinfo *nsi); +pid_t nsinfo__tgid(const struct nsinfo *nsi); +pid_t nsinfo__nstgid(const struct nsinfo *nsi); +pid_t nsinfo__pid(const struct nsinfo *nsi); +bool nsinfo__in_pidns(const struct nsinfo *nsi); +void nsinfo__set_in_pidns(struct nsinfo *nsi); + +void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc); +void nsinfo__mountns_exit(struct nscookie *nc); + +char *nsinfo__realpath(const char *path, struct nsinfo *nsi); +int nsinfo__stat(const char *filename, struct stat *st, struct nsinfo *nsi); + +bool nsinfo__is_in_root_namespace(void); + +static inline void __nsinfo__zput(struct nsinfo **nsip) +{ + if (nsip) { + nsinfo__put(*nsip); + *nsip = NULL; + } +} + +#define nsinfo__zput(nsi) __nsinfo__zput(&nsi) + +const char *perf_ns__name(unsigned int id); + +#endif /* __PERF_NAMESPACES_H */ -- cgit v1.3.1