From 1efde2754275dbd9d11c6e0132a4f09facf297ab Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Fri, 28 Feb 2020 00:42:01 +0900 Subject: perf probe: Do not depend on dwfl_module_addrsym() Do not depend on dwfl_module_addrsym() because it can fail on user-space shared libraries. Actually, same bug was fixed by commit 664fee3dc379 ("perf probe: Do not use dwfl_module_addrsym if dwarf_diename finds symbol name"), but commit 07d369857808 ("perf probe: Fix wrong address verification) reverted to get actual symbol address from symtab. This fixes it again by getting symbol address from DIE, and only if the DIE has only address range, it uses dwfl_module_addrsym(). Fixes: 07d369857808 ("perf probe: Fix wrong address verification) Reported-by: Alexandre Ghiti Signed-off-by: Masami Hiramatsu Tested-by: Alexandre Ghiti Cc: Alexander Shishkin Cc: Greg Kroah-Hartman Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Sasha Levin Link: http://lore.kernel.org/lkml/158281812176.476.14164573830975116234.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/probe-finder.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'tools/perf/util') diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index 1c817add6ca4..e4cff49384f4 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -637,14 +637,19 @@ static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, return -EINVAL; } - /* Try to get actual symbol name from symtab */ - symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); + if (dwarf_entrypc(sp_die, &eaddr) == 0) { + /* If the DIE has entrypc, use it. */ + symbol = dwarf_diename(sp_die); + } else { + /* Try to get actual symbol name and address from symtab */ + symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); + eaddr = sym.st_value; + } if (!symbol) { pr_warning("Failed to find symbol at 0x%lx\n", (unsigned long)paddr); return -ENOENT; } - eaddr = sym.st_value; tp->offset = (unsigned long)(paddr - eaddr); tp->address = (unsigned long)paddr; -- cgit v1.2.3