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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>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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*
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* Copyright (C) 2017 Hari Bathini, IBM Corporation
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*/
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#ifndef __PERF_NAMESPACES_H
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#define __PERF_NAMESPACES_H
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <linux/stddef.h>
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#include <linux/perf_event.h>
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#include <linux/refcount.h>
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#include <linux/types.h>
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#include <internal/rc_check.h>
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#ifndef HAVE_SETNS_SUPPORT
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int setns(int fd, int nstype);
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#endif
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struct perf_record_namespaces;
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struct namespaces {
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struct list_head list;
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u64 end_time;
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struct perf_ns_link_info link_info[];
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};
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struct namespaces *namespaces__new(struct perf_record_namespaces *event);
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void namespaces__free(struct namespaces *namespaces);
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DECLARE_RC_STRUCT(nsinfo) {
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pid_t pid;
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pid_t tgid;
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pid_t nstgid;
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bool need_setns;
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bool in_pidns;
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char *mntns_path;
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refcount_t refcnt;
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};
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struct nscookie {
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int oldns;
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int newns;
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char *oldcwd;
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};
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int nsinfo__init(struct nsinfo *nsi);
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struct nsinfo *nsinfo__new(pid_t pid);
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struct nsinfo *nsinfo__copy(const struct nsinfo *nsi);
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struct nsinfo *nsinfo__get(struct nsinfo *nsi);
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void nsinfo__put(struct nsinfo *nsi);
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bool nsinfo__need_setns(const struct nsinfo *nsi);
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void nsinfo__clear_need_setns(struct nsinfo *nsi);
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pid_t nsinfo__tgid(const struct nsinfo *nsi);
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pid_t nsinfo__nstgid(const struct nsinfo *nsi);
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pid_t nsinfo__pid(const struct nsinfo *nsi);
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pid_t nsinfo__in_pidns(const struct nsinfo *nsi);
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void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc);
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void nsinfo__mountns_exit(struct nscookie *nc);
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char *nsinfo__realpath(const char *path, struct nsinfo *nsi);
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int nsinfo__stat(const char *filename, struct stat *st, struct nsinfo *nsi);
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bool nsinfo__is_in_root_namespace(void);
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static inline void __nsinfo__zput(struct nsinfo **nsip)
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{
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if (nsip) {
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nsinfo__put(*nsip);
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*nsip = NULL;
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}
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}
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#define nsinfo__zput(nsi) __nsinfo__zput(&nsi)
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const char *perf_ns__name(unsigned int id);
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#endif /* __PERF_NAMESPACES_H */
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