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hush: more rodust detection of unterminated strings etc;

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fix a case where we forget to copy `cmd` text;
 optimize nommu heredoc helper by not passing environment to it;
 add several tests

function                                             old     new   delta
add_till_closing_paren                               256     308     +52
parse_stream                                        2337    2378     +41
add_till_backquote                                    82     111     +29
re_execute_shell                                     269     284     +15
handle_dollar                                        802     812     +10
parse_stream_dquoted                                 316     320      +4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 6/0 up/down: 151/0)             Total: 151 bytes
This commit is contained in:
Denis Vlasenko
2009-04-08 21:51:33 +00:00
parent ffe6f80851
commit 5c090a96f9
7 changed files with 177 additions and 31 deletions
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96
shell/hush.c
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@@ -2241,7 +2241,10 @@ static void re_execute_shell(const char *s, int is_heredoc)
debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s);
sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
execv(bb_busybox_exec_path, G.argv_from_re_execing);
execve(bb_busybox_exec_path,
G.argv_from_re_execing,
(is_heredoc ? pp /* points to NULL ptr */ : environ)
);
/* Fallback. Useful for init=/bin/hush usage etc */
if (G.argv0_for_re_execing[0] == '/')
execv(G.argv0_for_re_execing, G.argv_from_re_execing);
@@ -4402,35 +4405,40 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
#if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT
/* Subroutines for copying $(...) and `...` things */
static void add_till_backquote(o_string *dest, struct in_str *input);
static int add_till_backquote(o_string *dest, struct in_str *input);
/* '...' */
static void add_till_single_quote(o_string *dest, struct in_str *input)
static int add_till_single_quote(o_string *dest, struct in_str *input)
{
while (1) {
int ch = i_getch(input);
if (ch == EOF)
break;
if (ch == EOF) {
syntax("unterminated '");
return 1;
}
if (ch == '\'')
break;
return 0;
o_addchr(dest, ch);
}
}
/* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
static void add_till_double_quote(o_string *dest, struct in_str *input)
static int add_till_double_quote(o_string *dest, struct in_str *input)
{
while (1) {
int ch = i_getch(input);
if (ch == EOF) {
syntax("unterminated \"");
return 1;
}
if (ch == '"')
break;
return 0;
if (ch == '\\') { /* \x. Copy both chars. */
o_addchr(dest, ch);
ch = i_getch(input);
}
if (ch == EOF)
break;
o_addchr(dest, ch);
if (ch == '`') {
add_till_backquote(dest, input);
if (add_till_backquote(dest, input))
return 1;
o_addchr(dest, ch);
continue;
}
@@ -4451,20 +4459,27 @@ static void add_till_double_quote(o_string *dest, struct in_str *input)
* Example Output
* echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
*/
static void add_till_backquote(o_string *dest, struct in_str *input)
static int add_till_backquote(o_string *dest, struct in_str *input)
{
while (1) {
int ch = i_getch(input);
if (ch == EOF) {
syntax("unterminated `");
return 1;
}
if (ch == '`')
break;
if (ch == '\\') { /* \x. Copy both chars unless it is \` */
return 0;
if (ch == '\\') {
/* \x. Copy both chars unless it is \` */
int ch2 = i_getch(input);
if (ch2 == EOF) {
syntax("unterminated `");
return 1;
}
if (ch2 != '`' && ch2 != '$' && ch2 != '\\')
o_addchr(dest, ch);
ch = ch2;
}
if (ch == EOF)
break;
o_addchr(dest, ch);
}
}
@@ -4480,13 +4495,15 @@ static void add_till_backquote(o_string *dest, struct in_str *input)
* echo $(echo 'TEST)' BEST) TEST) BEST
* echo $(echo \(\(TEST\) BEST) ((TEST) BEST
*/
static void add_till_closing_paren(o_string *dest, struct in_str *input, bool dbl)
static int add_till_closing_paren(o_string *dest, struct in_str *input, bool dbl)
{
int count = 0;
while (1) {
int ch = i_getch(input);
if (ch == EOF)
break;
if (ch == EOF) {
syntax("unterminated )");
return 1;
}
if (ch == '(')
count++;
if (ch == ')') {
@@ -4501,23 +4518,29 @@ static void add_till_closing_paren(o_string *dest, struct in_str *input, bool db
}
o_addchr(dest, ch);
if (ch == '\'') {
add_till_single_quote(dest, input);
if (add_till_single_quote(dest, input))
return 1;
o_addchr(dest, ch);
continue;
}
if (ch == '"') {
add_till_double_quote(dest, input);
if (add_till_double_quote(dest, input))
return 1;
o_addchr(dest, ch);
continue;
}
if (ch == '\\') { /* \x. Copy verbatim. Important for \(, \) */
if (ch == '\\') {
/* \x. Copy verbatim. Important for \(, \) */
ch = i_getch(input);
if (ch == EOF)
break;
if (ch == EOF) {
syntax("unterminated )");
return 1;
}
o_addchr(dest, ch);
continue;
}
}
return 0;
}
#endif /* ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT */
@@ -4658,7 +4681,8 @@ static int handle_dollar(o_string *as_string,
# if !BB_MMU
pos = dest->length;
# endif
add_till_closing_paren(dest, input, true);
if (add_till_closing_paren(dest, input, true))
return 1;
# if !BB_MMU
if (as_string) {
o_addstr(as_string, dest->data + pos);
@@ -4671,20 +4695,19 @@ static int handle_dollar(o_string *as_string,
}
# endif
# if ENABLE_HUSH_TICK
//int pos = dest->length;
o_addchr(dest, SPECIAL_VAR_SYMBOL);
o_addchr(dest, quote_mask | '`');
# if !BB_MMU
pos = dest->length;
# endif
add_till_closing_paren(dest, input, false);
if (add_till_closing_paren(dest, input, false))
return 1;
# if !BB_MMU
if (as_string) {
o_addstr(as_string, dest->data + pos);
o_addchr(as_string, '`');
}
# endif
//debug_printf_subst("SUBST RES2 '%s'\n", dest->data + pos);
o_addchr(dest, SPECIAL_VAR_SYMBOL);
# endif
break;
@@ -4778,7 +4801,8 @@ static int parse_stream_dquoted(o_string *as_string,
//int pos = dest->length;
o_addchr(dest, SPECIAL_VAR_SYMBOL);
o_addchr(dest, 0x80 | '`');
add_till_backquote(dest, input);
if (add_till_backquote(dest, input))
return 1;
o_addchr(dest, SPECIAL_VAR_SYMBOL);
//debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
goto again;
@@ -5043,10 +5067,20 @@ static struct pipe *parse_stream(char **pstring,
break;
#if ENABLE_HUSH_TICK
case '`': {
//int pos = dest.length;
#if !BB_MMU
int pos;
#endif
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
o_addchr(&dest, '`');
add_till_backquote(&dest, input);
#if !BB_MMU
pos = dest.length;
#endif
if (add_till_backquote(&dest, input))
goto parse_error;
#if !BB_MMU
o_addstr(&ctx.as_string, dest.data + pos);
o_addchr(&ctx.as_string, '`');
#endif
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
//debug_printf_subst("SUBST RES3 '%s'\n", dest.data + pos);
break;