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checkpolicy: handle unprintable token

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In case the erroneous token is unprintable, e.g. a control character,
print its hex value instead.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>
This commit is contained in:
Christian Göttsche 2024-03-22 15:50:49 +01:00 committed by James Carter
parent ca77c59299
commit 39b3cc5135
1 changed files with 11 additions and 1 deletions
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12
checkpolicy/policy_scan.l
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@ -320,6 +320,16 @@ GLBLUB { return(GLBLUB); }
int yyerror(const char *msg)
{
#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
const char *token;
char buf[8];
if (isprint((unsigned char)yytext[0])) {
token = yytext;
} else {
snprintf(buf, sizeof(buf), "%#x", yytext[0]);
token = buf;
}
if (source_file[0])
fprintf(stderr, "%s:%lu:",
source_file, source_lineno);
@ -327,7 +337,7 @@ int yyerror(const char *msg)
fprintf(stderr, "(unknown source)::");
fprintf(stderr, "ERROR '%s' at token '%s' on line %lu:\n%s\n%s\n",
msg,
yytext,
token,
policydb_lineno,
linebuf[0], linebuf[1]);
#else