Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH 10/10] tools, perf: Add asprintf replacement | Date | Wed, 12 Nov 2014 18:05:28 -0800 |
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From: Andi Kleen <ak@linux.intel.com>
asprintf corrupts memory on some older glibc versions. Provide a replacement. This fixes various segfaults with --branch-history on older Fedoras.
v2: Remove bogus hunk. Support arbitrary size (Geert Uytterhoeven) Signed-off-by: Andi Kleen <ak@linux.intel.com> --- tools/perf/Makefile.perf | 1 + tools/perf/builtin-report.c | 1 + tools/perf/util/asprintf.c | 34 ++++++++++++++++++++++++++++++++++ 3 files changed, 36 insertions(+) create mode 100644 tools/perf/util/asprintf.c
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf index aecf61dc..9db4ff1 100644 --- a/tools/perf/Makefile.perf +++ b/tools/perf/Makefile.perf @@ -395,6 +395,7 @@ LIB_OBJS += $(OUTPUT)util/vdso.o LIB_OBJS += $(OUTPUT)util/stat.o LIB_OBJS += $(OUTPUT)util/record.o LIB_OBJS += $(OUTPUT)util/srcline.o +LIB_OBJS += $(OUTPUT)util/asprintf.o LIB_OBJS += $(OUTPUT)util/data.o LIB_OBJS += $(OUTPUT)util/tsc.o LIB_OBJS += $(OUTPUT)util/cloexec.o diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index fb272ff..493f011 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -762,6 +762,7 @@ repeat: } if (branch_call_mode) { callchain_param.branch_callstack = 1; + callchain_param.key = CCKEY_ADDRESS; symbol_conf.use_callchain = true; callchain_register_param(&callchain_param); if (sort_order == NULL) diff --git a/tools/perf/util/asprintf.c b/tools/perf/util/asprintf.c new file mode 100644 index 0000000..6177ee8 --- /dev/null +++ b/tools/perf/util/asprintf.c @@ -0,0 +1,34 @@ +/* Replacement for asprintf as it's buggy in older glibc versions */ +#include <stdio.h> +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> + +int vasprintf(char **str, const char *fmt, va_list ap) +{ + va_list ao; + char buf[1024]; + int len; + + va_copy(ao, ap); + len = vsnprintf(buf, sizeof(buf), fmt, ap); + *str = malloc(len + 1); + if (!*str) + return -1; + if ((size_t)len < sizeof(buf)) { + strcpy(*str, buf); + return len; + } + return vsnprintf(*str, len + 1, fmt, ao); +} + +int asprintf(char **str, const char *fmt, ...) +{ + va_list ap; + int ret; + + va_start(ap, fmt); + ret = vasprintf(str, fmt, ap); + va_end(ap); + return ret; +} -- 1.9.3
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