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author | Li Zhang <zhlcindy@linux.vnet.ibm.com> | 2015-06-19 16:57:33 +0800 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-06-26 12:11:53 -0300 |
commit | 36c8bb56a9f718a9a5f35d1834ca9dcec95deb4a (patch) | |
tree | ca03e7f2fa83e2401af8f1c773c297baae2115b7 /tools/perf/builtin-report.c | |
parent | 32b8af82e3708bc19af75c31fa773a98449f0edc (diff) | |
download | linux-36c8bb56a9f718a9a5f35d1834ca9dcec95deb4a.tar.gz linux-36c8bb56a9f718a9a5f35d1834ca9dcec95deb4a.tar.bz2 linux-36c8bb56a9f718a9a5f35d1834ca9dcec95deb4a.zip |
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 <zhlcindy@linux.vnet.ibm.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1434704253-2632-1-git-send-email-zhlcindy@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-report.c')
-rw-r--r-- | tools/perf/builtin-report.c | 11 |
1 files changed, 11 insertions, 0 deletions
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) |