c35ce1d918
Add reference count checking controlled by REFCNT_CHECKING ifdef. The reference count checking interposes an allocated pointer between the reference counted struct on a get and frees the pointer on a put. Accesses after a put cause faults and use after free, missed puts are caughts as leaks and double puts are double frees. This checking helped resolve a memory leak and use after free: https://lore.kernel.org/linux-perf-users/CAP-5=fWZH20L4kv-BwVtGLwR=Em3AOOT+Q4QGivvQuYn5AsPRg@mail.gmail.com/ Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com> Cc: Dmitriy Vyukov <dvyukov@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Riccardo Mancini <rickyman7@gmail.com> Cc: Stephane Eranian <eranian@google.com> Cc: Stephen Brennan <stephen.s.brennan@oracle.com> Link: https://lore.kernel.org/lkml/20230407230405.2931830-4-irogers@google.com [ Extracted from a larger patch ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
*
|
|
* Copyright (C) 2017 Hari Bathini, IBM Corporation
|
|
*/
|
|
|
|
#ifndef __PERF_NAMESPACES_H
|
|
#define __PERF_NAMESPACES_H
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/refcount.h>
|
|
#include <linux/types.h>
|
|
#include <internal/rc_check.h>
|
|
|
|
#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);
|
|
pid_t nsinfo__in_pidns(const 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 */
|