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authorDenys Vlasenko2016-09-21 16:25:58 +0200
committerDenys Vlasenko2016-09-21 16:25:58 +0200
commitb3f29b452a660a7293162897424bed205f7f9147 (patch)
treebd334b845e1affd68620bcffe60c3e6381606958 /shell
parentd8330ca4a42a7f5d81b233a1cf7cbc7a7bd0be95 (diff)
downloadbusybox-b3f29b452a660a7293162897424bed205f7f9147.zip
busybox-b3f29b452a660a7293162897424bed205f7f9147.tar.gz
ash: use glob() from libc
Adapted from dash. The "homegrown" glob code is retained (ifdef'ed out). This changes was inspired by bug 9261, which detected out-of bounds use of heap for 2098 byte long name in the "homegrown" code. This is still not fixed... function old new delta expandarg 960 982 +22 static.syntax_index_table 26 25 -1 static.spec_symbls 27 26 -1 static.metachars 4 - -4 addfname 42 - -42 msort 126 - -126 expmeta 528 - -528 ------------------------------------------------------------------------------ (add/remove: 0/4 grow/shrink: 1/2 up/down: 22/-702) Total: -680 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
-rw-r--r--shell/ash.c102
1 files changed, 91 insertions, 11 deletions
diff --git a/shell/ash.c b/shell/ash.c
index d96e568..2674937 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -39,6 +39,7 @@
#include <setjmp.h>
#include <fnmatch.h>
+#include <glob.h>
#include <sys/times.h>
#include <sys/utsname.h> /* for setting $HOSTNAME */
@@ -2808,18 +2809,27 @@ enum {
static int
SIT(int c, int syntax)
{
- static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
+ /* Used to also have '/' in this string: "\t\n !\"$&'()*-/:;<=>?[\\]`|}~" */
+ static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-:;<=>?[\\]`|}~";
+ /*
+ * This causes '/' to be prepended with CTLESC in dquoted string,
+ * making "./file"* treated incorrectly because we feed
+ * ".\/file*" string to glob(), confusing it (see expandmeta func).
+ * The "homegrown" glob implementation is okay with that,
+ * but glibc one isn't. With '/' always treated as CWORD,
+ * both work fine.
+ */
# if ENABLE_ASH_ALIAS
static const uint8_t syntax_index_table[] ALIGN1 = {
1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
- 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
+ 7, 8, 3, 3,/*3,*/3, 1, 1, /* "()*-/:;<" */
3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
11, 3 /* "}~" */
};
# else
static const uint8_t syntax_index_table[] ALIGN1 = {
0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
- 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
+ 6, 7, 2, 2,/*2,*/2, 0, 0, /* "()*-/:;<" */
2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
10, 2 /* "}~" */
};
@@ -2901,7 +2911,8 @@ static const uint8_t syntax_index_table[] ALIGN1 = {
/* 44 "," */ CWORD_CWORD_CWORD_CWORD,
/* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
/* 46 "." */ CWORD_CWORD_CWORD_CWORD,
- /* 47 "/" */ CWORD_CCTL_CCTL_CWORD,
+/* "/" was CWORD_CCTL_CCTL_CWORD, see comment in SIT() function why this is changed: */
+ /* 47 "/" */ CWORD_CWORD_CWORD_CWORD,
/* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
/* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
/* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
@@ -5633,7 +5644,6 @@ rmescapes(char *str, int flag)
while (*p) {
if ((unsigned char)*p == CTLQUOTEMARK) {
// Note: both inquotes and protect_against_glob only affect whether
-// CTLESC,<ch> gets converted to <ch> or to \<ch>
inquotes = ~inquotes;
p++;
protect_against_glob = globbing;
@@ -5697,11 +5707,14 @@ memtodest(const char *p, size_t len, int syntax, int quotes)
unsigned char c = *p++;
if (c) {
int n = SIT(c, syntax);
- if ((quotes & QUOTES_ESC) &&
- ((n == CCTL) ||
- (((quotes & EXP_FULL) || syntax != BASESYNTAX) &&
- n == CBACK)))
+ if ((quotes & QUOTES_ESC)
+ && ((n == CCTL)
+ || (((quotes & EXP_FULL) || syntax != BASESYNTAX)
+ && n == CBACK)
+ )
+ ) {
USTPUTC(CTLESC, q);
+ }
} else if (!(quotes & QUOTES_KEEPNUL))
continue;
USTPUTC(c, q);
@@ -6435,7 +6448,8 @@ subevalvar(char *p, char *varname, int strloc, int subtype,
char *idx, *end;
if (!repl) {
- if ((repl=strchr(str, CTLESC)))
+ repl = strchr(str, CTLESC);
+ if (repl)
*repl++ = '\0';
else
repl = nullstr;
@@ -6976,6 +6990,70 @@ addfname(const char *name)
exparg.lastp = &sp->next;
}
+/* If we want to use glob() from libc... */
+#if 1
+
+/* Add the result of glob() to the list */
+static void
+addglob(const glob_t *pglob)
+{
+ char **p = pglob->gl_pathv;
+
+ do {
+ addfname(*p);
+ } while (*++p);
+}
+static void
+expandmeta(struct strlist *str /*, int flag*/)
+{
+ /* TODO - EXP_REDIR */
+
+ while (str) {
+ char *p;
+ glob_t pglob;
+ int i;
+
+ if (fflag)
+ goto nometa;
+ INT_OFF;
+ p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
+ /*
+ * GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
+ * TODO?: GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
+ */
+ i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
+ if (p != str->text)
+ free(p);
+ switch (i) {
+ case 0:
+ /* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
+ if (!(pglob.gl_flags & GLOB_MAGCHAR))
+ goto nometa2;
+ addglob(&pglob);
+ globfree(&pglob);
+ INT_ON;
+ break;
+ case GLOB_NOMATCH:
+nometa2:
+ globfree(&pglob);
+ INT_ON;
+nometa:
+ *exparg.lastp = str;
+ rmescapes(str->text, 0);
+ exparg.lastp = &str->next;
+ break;
+ default: /* GLOB_NOSPACE */
+ globfree(&pglob);
+ INT_ON;
+ ash_msg_and_raise_error(bb_msg_memory_exhausted);
+ }
+ str = str->next;
+ }
+}
+
+#else
+/* Homegrown globbing code. (dash also has both, uses homegrown one.) */
+
/*
* Do metacharacter (i.e. *, ?, [...]) expansion.
*/
@@ -7179,7 +7257,8 @@ expandmeta(struct strlist *str /*, int flag*/)
p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
{
int i = strlen(str->text);
- expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
+//BUGGY estimation of how long expanded name can be
+ expdir = ckmalloc(i < 2048 ? 2048 : i+1);
}
expmeta(expdir, expdir, p);
free(expdir);
@@ -7204,6 +7283,7 @@ expandmeta(struct strlist *str /*, int flag*/)
str = str->next;
}
}
+#endif /* our globbing code */
/*
* Perform variable substitution and command substitution on an argument,