From 36c8bb56a9f718a9a5f35d1834ca9dcec95deb4a Mon Sep 17 00:00:00 2001 From: Li Zhang Date: Fri, 19 Jun 2015 16:57:33 +0800 Subject: [PATCH] perf symbols: Check access permission when reading symbol files There 2 problems when reading symbols files: * It doesn't report any errors even if when users specify symbol files which don't exist with --kallsyms or --vmlinux. The result just shows the address without symbols, which is not what is expected. So it's better to report errors and exit the program. * When using command perf report --kallsyms=/proc/kallsyms with a non-root user, symbols are resolved. Then select one symbol and annotate it, it reports the error as the following: Can't annotate __clear_user: No vmlinux file with build id xxx was found. The problem is caused by reading /proc/kcore without access permission. /proc/kcore requires CAP_SYS_RAWIO capability to access, so it needs to change access permission to allow a specific user to read /proc/kcore or use root to execute the perf command. This patch is to report errors when symbol files specified by users don't exist. And check access permission of /proc/kcore when reading it. Signed-off-by: Li Zhang Cc: Sukadev Bhattiprolu Link: http://lkml.kernel.org/r/1434704253-2632-1-git-send-email-zhlcindy@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-report.c | 11 +++++++++++ tools/perf/util/symbol.c | 5 ++++- 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index 32626ea3e227..348bed4a2abf 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -742,6 +742,17 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused) argc = parse_options(argc, argv, options, report_usage, 0); + if (symbol_conf.vmlinux_name && + access(symbol_conf.vmlinux_name, R_OK)) { + pr_err("Invalid file: %s\n", symbol_conf.vmlinux_name); + return -EINVAL; + } + if (symbol_conf.kallsyms_name && + access(symbol_conf.kallsyms_name, R_OK)) { + pr_err("Invalid file: %s\n", symbol_conf.kallsyms_name); + return -EINVAL; + } + if (report.use_stdio) use_browser = 0; else if (report.use_tui) diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 504f2d73b7ee..48b588c6951a 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1132,8 +1132,11 @@ static int dso__load_kcore(struct dso *dso, struct map *map, INIT_LIST_HEAD(&md.maps); fd = open(kcore_filename, O_RDONLY); - if (fd < 0) + if (fd < 0) { + pr_err("%s requires CAP_SYS_RAWIO capability to access.\n", + kcore_filename); return -EINVAL; + } /* Read new maps into temporary lists */ err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md, -- 2.34.1