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o Backout rev. 1.40 and rev. 1.49.

Browse Source 
o Add argv[] boudary check.

PR:		bin/40117
Reviewed by:	silence on -audit
MFC after:	2 months
This commit is contained in:
Maxim Konovalov 2002-08-15 14:53:20 +00:00
parent ecd3e8ff5a
commit 6c62b0477e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=101923
1 changed files with 34 additions and 36 deletions
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70
bin/test/test.c
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@ -161,6 +161,7 @@ struct t_op {
};
struct t_op const *t_wp_op;
int nargc;
char **t_wp;
static int aexpr(enum token);
@ -182,23 +183,8 @@ static enum token t_lex(char *);
int
main(int argc, char **argv)
{
int i, res;
int res;
char *p;
char **nargv;
/*
* XXX copy the whole contents of argv to a newly allocated
* space with two extra cells filled with NULL's - this source
* code totally depends on their presence.
*/
if ((nargv = (char **)malloc((argc + 2) * sizeof(char *))) == NULL)
error("Out of space");
for (i = 0; i < argc; i++)
nargv[i] = argv[i];
nargv[i] = nargv[i + 1] = NULL;
argv = nargv;
if ((p = rindex(argv[0], '/')) == NULL)
p = argv[0];
@ -210,15 +196,19 @@ main(int argc, char **argv)
argv[argc] = NULL;
}
/* no expression => false */
if (--argc <= 0)
return 1;
#ifndef SHELL
(void)setlocale(LC_CTYPE, "");
#endif
nargc = argc;
t_wp = &argv[1];
res = !oexpr(t_lex(*t_wp));
if (*t_wp != NULL && *++t_wp != NULL)
if (--nargc > 0)
syntax(*t_wp, "unexpected operator");
free(nargv);
return res;
}
@ -239,9 +229,11 @@ oexpr(enum token n)
int res;
res = aexpr(n);
if (t_lex(*++t_wp) == BOR)
return oexpr(t_lex(*++t_wp)) || res;
if (t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL) == BOR)
return oexpr(t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL)) ||
res;
t_wp--;
nargc++;
return res;
}
@ -251,9 +243,11 @@ aexpr(enum token n)
int res;
res = nexpr(n);
if (t_lex(*++t_wp) == BAND)
return aexpr(t_lex(*++t_wp)) && res;
if (t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL) == BAND)
return aexpr(t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL)) &&
res;
t_wp--;
nargc++;
return res;
}
@ -261,7 +255,7 @@ static int
nexpr(enum token n)
{
if (n == UNOT)
return !nexpr(t_lex(*++t_wp));
return !nexpr(t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL));
return primary(n);
}
@ -274,30 +268,32 @@ primary(enum token n)
if (n == EOI)
return 0; /* missing expression */
if (n == LPAREN) {
if ((nn = t_lex(*++t_wp)) == RPAREN)
if ((nn = t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL)) ==
RPAREN)
return 0; /* missing expression */
res = oexpr(nn);
if (t_lex(*++t_wp) != RPAREN)
if (t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL) != RPAREN)
syntax(NULL, "closing paren expected");
return res;
}
if (t_wp_op && t_wp_op->op_type == UNOP) {
/* unary expression */
if (*++t_wp == NULL)
if (--nargc == 0)
syntax(t_wp_op->op_text, "argument expected");
switch (n) {
case STREZ:
return strlen(*t_wp) == 0;
return strlen(*++t_wp) == 0;
case STRNZ:
return strlen(*t_wp) != 0;
return strlen(*++t_wp) != 0;
case FILTT:
return isatty(getn(*t_wp));
return isatty(getn(*++t_wp));
default:
return filstat(*t_wp, n);
return filstat(*++t_wp, n);
}
}
if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) {
if (t_lex(nargc > 0 ? t_wp[1] : NULL), t_wp_op && t_wp_op->op_type ==
BINOP) {
return binop();
}
@ -311,10 +307,10 @@ binop(void)
struct t_op const *op;
opnd1 = *t_wp;
(void) t_lex(*++t_wp);
(void) t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL);
op = t_wp_op;
if ((opnd2 = *++t_wp) == NULL)
if ((opnd2 = nargc > 0 ? (--nargc, *++t_wp) : NULL) == NULL)
syntax(op->op_text, "argument expected");
switch (op->op_num) {
@ -415,7 +411,7 @@ t_lex(char *s)
while (op->op_text) {
if (strcmp(s, op->op_text) == 0) {
if ((op->op_type == UNOP && isoperand()) ||
(op->op_num == LPAREN && *(t_wp+1) == 0))
(op->op_num == LPAREN && nargc == 1))
break;
t_wp_op = op;
return op->op_num;
@ -433,10 +429,12 @@ isoperand(void)
char *s;
char *t;
if ((s = *(t_wp+1)) == 0)
if (nargc == 1)
return 1;
if ((t = *(t_wp+2)) == 0)
if (nargc == 2)
return 0;
s = *(t_wp + 1);
t = *(t_wp + 2);
while (op->op_text) {
if (strcmp(s, op->op_text) == 0)
return op->op_type == BINOP &&