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If the DSO later executes via the command-line fallback due to an inlined bug, the a2l pointer is unconditionally populated with a child_process process wrapper. If libbfd is queried again, the offline reader attempts to cast struct a2l_data into child_process, coercing random arbitrary instruction addresses and causing silent aborts. This cleanly splits the caches. Fixes: 257046a36750 ("perf srcline: Fallback between addr2line implementations") Signed-off-by: Ian Rogers Assisted-by: Antigravity:gemini-3.1-pro --- tools/perf/util/dso.c | 49 +++++++++++++++++++++++---------------- tools/perf/util/dso.h | 21 +++++++++++++++-- tools/perf/util/libbfd.c | 10 ++++---- tools/perf/util/srcline.c | 2 ++ 4 files changed, 55 insertions(+), 27 deletions(-) diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index df39e6ca88e6..6510767177be 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -1,38 +1,45 @@ // SPDX-License-Identifier: GPL-2.0 +#include "dso.h" + +#include +#include + #include +#include #include #include #include -#include #include -#include #include +#include +#include #include -#include -#include -#include -#ifdef HAVE_LIBBPF_SUPPORT -#include -#include "bpf-event.h" -#include "bpf-utils.h" -#endif + +#include "annotate-data.h" +#include "auxtrace.h" #include "compress.h" +#include "debug.h" +#include "dso.h" +#include "dsos.h" #include "env.h" +#include "libbfd.h" +#include "libdw.h" +#include "machine.h" +#include "map.h" #include "namespaces.h" #include "path.h" -#include "map.h" -#include "symbol.h" #include "srcline.h" -#include "dso.h" -#include "dsos.h" -#include "machine.h" -#include "auxtrace.h" -#include "util.h" /* O_CLOEXEC for older systems */ -#include "debug.h" #include "string2.h" +#include "symbol.h" +#include "util.h" /* O_CLOEXEC for older systems */ #include "vdso.h" -#include "annotate-data.h" -#include "libdw.h" + +#ifdef HAVE_LIBBPF_SUPPORT +#include + +#include "bpf-event.h" +#include "bpf-utils.h" +#endif static const char * const debuglink_paths[] = { "%.0s%s", @@ -1757,6 +1764,7 @@ void dso__delete(struct dso *dso) auxtrace_cache__free(RC_CHK_ACCESS(dso)->auxtrace_cache); dso_cache__free(dso); dso__free_a2l(dso); + dso__free_a2l_libbfd(dso); dso__free_libdw(dso); dso__free_symsrc_filename(dso); nsinfo__zput(RC_CHK_ACCESS(dso)->nsinfo); @@ -2081,6 +2089,7 @@ void dso__set_symsrc_filename(struct dso *dso, char *val) RC_CHK_ACCESS(dso)->symsrc_filename = val; dso__free_libdw(dso); dso__free_a2l(dso); + dso__free_a2l_libbfd(dso); dso__set_has_srcline(dso, true); dso__set_a2l_fails(dso, 0); } diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h index 7966c7048c85..e7d5f4bbf894 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -304,7 +304,12 @@ DECLARE_RC_STRUCT(dso) { const char *short_name; const char *long_name; void *a2l; +#ifdef HAVE_LIBBFD_SUPPORT + void *a2l_libbfd; +#endif +#ifdef HAVE_LIBDW_SUPPORT void *libdw; +#endif char *symsrc_filename; struct nsinfo *nsinfo; struct auxtrace_cache *auxtrace_cache; @@ -368,6 +373,20 @@ static inline void dso__set_a2l(struct dso *dso, void *val) RC_CHK_ACCESS(dso)->a2l = val; } +#ifdef HAVE_LIBBFD_SUPPORT +static inline void *dso__a2l_libbfd(const struct dso *dso) +{ + return RC_CHK_ACCESS(dso)->a2l_libbfd; +} + +static inline void dso__set_a2l_libbfd(struct dso *dso, void *val) +{ + RC_CHK_ACCESS(dso)->a2l_libbfd = val; +} +#endif + +struct Dwfl; +#ifdef HAVE_LIBDW_SUPPORT static inline void *dso__libdw(const struct dso *dso) { return RC_CHK_ACCESS(dso)->libdw; @@ -378,8 +397,6 @@ static inline void dso__set_libdw(struct dso *dso, void *val) RC_CHK_ACCESS(dso)->libdw = val; } -struct Dwfl; -#ifdef HAVE_LIBDW_SUPPORT struct Dwfl *dso__libdw_dwfl(struct dso *dso); #else static inline struct Dwfl *dso__libdw_dwfl(struct dso *dso __maybe_unused) diff --git a/tools/perf/util/libbfd.c b/tools/perf/util/libbfd.c index 807944cd978c..d87242d88525 100644 --- a/tools/perf/util/libbfd.c +++ b/tools/perf/util/libbfd.c @@ -239,7 +239,7 @@ static int inline_list__append_dso_a2l(struct dso *dso, struct inline_node *node, struct symbol *sym) { - struct a2l_data *a2l = dso__a2l(dso); + struct a2l_data *a2l = dso__a2l_libbfd(dso); struct symbol *inline_sym = new_inline_sym(dso, sym, a2l->funcname); char *srcline = NULL; @@ -259,11 +259,11 @@ int libbfd__addr2line(const char *dso_name, u64 addr, mutex_lock(dso__lock(dso)); dso_name = dso__symsrc_filename(dso) ?: dso_name; - a2l = dso__a2l(dso); + a2l = dso__a2l_libbfd(dso); if (!a2l) { a2l = addr2line_init(dso_name); - dso__set_a2l(dso, a2l); + dso__set_a2l_libbfd(dso, a2l); } if (a2l == NULL) { @@ -324,14 +324,14 @@ int libbfd__addr2line(const char *dso_name, u64 addr, void dso__free_a2l_libbfd(struct dso *dso) { - struct a2l_data *a2l = dso__a2l(dso); + struct a2l_data *a2l = dso__a2l_libbfd(dso); if (!a2l) return; addr2line_cleanup(a2l); - dso__set_a2l(dso, NULL); + dso__set_a2l_libbfd(dso, NULL); } static int bfd_symbols__cmpvalue(const void *a, const void *b) diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c index e60dea472507..68798a4de887 100644 --- a/tools/perf/util/srcline.c +++ b/tools/perf/util/srcline.c @@ -300,6 +300,7 @@ char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym, if (dso__a2l_fails(dso) > A2L_FAIL_LIMIT) { dso__set_has_srcline(dso, false); dso__free_a2l(dso); + dso__free_a2l_libbfd(dso); } mutex_unlock(dso__lock(dso)); out: @@ -347,6 +348,7 @@ char *get_srcline_split(struct dso *dso, u64 addr, unsigned *line) if (dso__a2l_fails(dso) > A2L_FAIL_LIMIT) { dso__set_has_srcline(dso, false); dso__free_a2l(dso); + dso__free_a2l_libbfd(dso); } mutex_unlock(dso__lock(dso)); -- 2.55.0.1082.g2b9226bbc0-goog