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authorPavel Tikhomirov <ptikhomirov@virtuozzo.com>2018-08-23 13:25:34 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-03-10 07:09:00 +0100
commit1eadda06dcda82a8fe48b603b346261bdd495542 (patch)
tree3f0f0e932c3a22ad36c20931ab36819e9fba013d /kernel
parentad0051c0d6da31261c4795a67ce6f5ca2710bedc (diff)
tracing: Fix event filters and triggers to handle negative numbers
commit 6a072128d262d2b98d31626906a96700d1fc11eb upstream. Then tracing syscall exit event it is extremely useful to filter exit codes equal to some negative value, to react only to required errors. But negative numbers does not work: [root@snorch sys_exit_read]# echo "ret == -1" > filter bash: echo: write error: Invalid argument [root@snorch sys_exit_read]# cat filter ret == -1 ^ parse_error: Invalid value (did you forget quotes)? Similar thing happens when setting triggers. These is a regression in v4.17 introduced by the commit mentioned below, testing without these commit shows no problem with negative numbers. Link: http://lkml.kernel.org/r/20180823102534.7642-1-ptikhomirov@virtuozzo.com Cc: stable@vger.kernel.org Fixes: 80765597bc58 ("tracing: Rewrite filter logic to be simpler and faster") Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_events_filter.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 27821480105e..217ef481fbbb 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1301,7 +1301,7 @@ static int parse_pred(const char *str, void *data,
/* go past the last quote */
i++;
- } else if (isdigit(str[i])) {
+ } else if (isdigit(str[i]) || str[i] == '-') {
/* Make sure the field is not a string */
if (is_string_field(field)) {
@@ -1314,6 +1314,9 @@ static int parse_pred(const char *str, void *data,
goto err_free;
}
+ if (str[i] == '-')
+ i++;
+
/* We allow 0xDEADBEEF */
while (isalnum(str[i]))
i++;