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Sync with NetBSD, mainly address NetBSD bug #43355:

Browse source 
Fix valid_format() to be more careful about allowing only valid
printf formats.

Obtained from:	NetBSD
MFC after:	2 weeks
This commit is contained in:
Xin LI 2014-12-18 20:23:19 +00:00
parent 17eee5222e
commit bf855dd342
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=275918
2 changed files with 53 additions and 31 deletions
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9
usr.bin/seq/seq.1
View file

@ -1,4 +1,4 @@
.\" $NetBSD: seq.1,v 1.6 2008/11/26 15:03:47 ginsbach Exp $
.\" $NetBSD: seq.1,v 1.8 2013/04/07 17:37:45 jdf Exp $
.\"
.\" Copyright (c) 2005 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -29,7 +29,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd February 19, 2010
.Dd September 10, 2013
.Dt SEQ 1
.Os
.Sh NAME
@ -59,7 +59,7 @@ as possible, in increments of
When
.Ar first
is larger than
.Ar last
.Ar last ,
the default
.Ar incr
is -1.
@ -79,8 +79,11 @@ style
.Ar format
to print each number.
Only the
.Cm A ,
.Cm a ,
.Cm E ,
.Cm e ,
.Cm F ,
.Cm f ,
.Cm G ,
.Cm g ,

75
usr.bin/seq/seq.c
View file

@ -1,4 +1,4 @@
/* $NetBSD: seq.c,v 1.5 2008/07/21 14:19:26 lukem Exp $ */
/* $NetBSD: seq.c,v 1.7 2010/05/27 08:40:19 dholland Exp $ */
/*
* Copyright (c) 2005 The NetBSD Foundation, Inc.
* All rights reserved.
@ -158,6 +158,8 @@ main(int argc, char *argv[])
if (!valid_format(fmt))
errx(1, "invalid format string: `%s'", fmt);
fmt = unescape(fmt);
if (!valid_format(fmt))
errx(1, "invalid format string");
/*
* XXX to be bug for bug compatible with Plan 9 add a
* newline if none found at the end of the format string.
@ -225,39 +227,56 @@ numeric(const char *s)
static int
valid_format(const char *fmt)
{
int conversions = 0;
unsigned conversions = 0;
while (*fmt != '\0') {
/* scan for conversions */
if (*fmt != '\0' && *fmt != '%') {
do {
fmt++;
} while (*fmt != '\0' && *fmt != '%');
if (*fmt != '%') {
fmt++;
continue;
}
/* scan a conversion */
if (*fmt != '\0') {
do {
fmt++;
/* allow %% but not things like %10% */
if (*fmt == '%') {
fmt++;
continue;
}
/* flags */
while (*fmt != '\0' && strchr("#0- +'", *fmt)) {
fmt++;
}
/* field width */
while (*fmt != '\0' && strchr("0123456789", *fmt)) {
fmt++;
}
/* precision */
if (*fmt == '.') {
fmt++;
while (*fmt != '\0' && strchr("0123456789", *fmt)) {
fmt++;
}
}
/* ok %% */
if (*fmt == '%') {
fmt++;
break;
}
/* valid conversions */
if (strchr("eEfgG", *fmt) &&
conversions++ < 1) {
fmt++;
break;
}
/* flags, width and precision */
if (isdigit((unsigned char)*fmt) ||
strchr("+- 0#.", *fmt))
continue;
/* oops! bad conversion format! */
return (0);
} while (*fmt != '\0');
/* conversion */
switch (*fmt) {
case 'A':
case 'a':
case 'E':
case 'e':
case 'F':
case 'f':
case 'G':
case 'g':
/* floating point formats are accepted */
conversions++;
break;
default:
/* anything else is not */
return 0;
}
}