From 03ff4c6b3e41b3530c6c88cc91a7af599322eb89 Mon Sep 17 00:00:00 2001 From: Ian Rogers Date: Thu, 7 Sep 2023 14:05:33 -0700 Subject: perf parse-events: Avoid erange from hex numbers We specify that a "num_hex" comprises 1 or more digits, however, that allows strtoull to fail with ERANGE. Limit the number of hex digits to being between 1 and 16. Before: ``` $ perf stat -e 'cpu/rE7574c47490475745/' true perf: util/parse-events.c:215: fix_raw: Assertion `errno == 0' failed. Aborted (core dumped) ``` After: ``` $ perf stat -e 'cpu/rE7574c47490475745/' true event syntax error: 'cpu/rE7574c47490475745/' \___ Bad event or PMU Unable to find PMU or event on a PMU of 'cpu' Initial error: event syntax error: 'cpu/rE7574c47490475745/' \___ unknown term 'rE7574c47490475745' for pmu 'cpu' valid terms: event,pc,edge,offcore_rsp,ldlat,inv,umask,frontend,cmask,config,config1,config2,config3,name,period,percore,metric-id Run 'perf list' for a list of valid events Usage: perf stat [] [] -e, --event event selector. use 'perf list' to list available events ``` Issue found through fuzz testing. Signed-off-by: Ian Rogers Acked-by: Namhyung Kim Link: https://lore.kernel.org/r/20230907210533.3712979-1-irogers@google.com Signed-off-by: Namhyung Kim --- tools/perf/util/parse-events.l | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'tools') diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l index 7bdf0565a92c..e86c45675e1d 100644 --- a/tools/perf/util/parse-events.l +++ b/tools/perf/util/parse-events.l @@ -156,8 +156,8 @@ event_pmu [^,{}/]+[/][^/]*[/][^,{}/]* event [^,{}/]+ num_dec [0-9]+ -num_hex 0x[a-fA-F0-9]+ -num_raw_hex [a-fA-F0-9]+ +num_hex 0x[a-fA-F0-9]{1,16} +num_raw_hex [a-fA-F0-9]{1,16} name [a-zA-Z_*?\[\]][a-zA-Z0-9_*?.\[\]!\-]* name_tag [\'][a-zA-Z_*?\[\]][a-zA-Z0-9_*?\-,\.\[\]:=]*[\'] name_minus [a-zA-Z_*?][a-zA-Z0-9\-_*?.:]* -- cgit