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Better handling of really long commands.

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Commands in the range of 16k-32k should now work, and commands longer than that should cause hush to die with an error message instead of corrupting stuff (at least in the simple cases I tested).

It would be possible to eliminate the 32k limit by using a type larger than "int" for lengths, but that would be a more invasive change.
This commit is contained in:
Stephen Heumann 2015-01-16 21:33:13 -06:00
parent 24b49d61e7
commit 2eafa59ebc
1 changed files with 20 additions and 4 deletions
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24
shell/hush.c
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@ -2399,10 +2399,20 @@ static ALWAYS_INLINE void o_free_unsafe(o_string *o)
free(o->data);
}
static const char *command_too_long_msg = "command too long";
static void o_grow_by(o_string *o, int len)
{
if (o->length + len > o->maxlen) {
o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
size_t length_needed = (size_t)o->length + len;
if (length_needed > o->maxlen) {
size_t new_maxlen = o->maxlen + (2*(size_t)len > B_CHUNK ? 2*(size_t)len : B_CHUNK);
if (new_maxlen >= INT_MAX) {
if (length_needed < INT_MAX)
new_maxlen = INT_MAX - 1;
else
bb_perror_msg_and_die(command_too_long_msg);
}
o->maxlen = new_maxlen;
o->data = xrealloc(o->data, 1 + o->maxlen);
}
}
@ -2426,7 +2436,10 @@ static void o_addblock(o_string *o, const char *str, int len)
static void o_addstr(o_string *o, const char *str)
{
o_addblock(o, str, strlen(str));
size_t len = strlen(str);
if (len > INT_MAX)
bb_perror_msg_and_die(command_too_long_msg);
o_addblock(o, str, len);
}
#if !BB_MMU
@ -2441,7 +2454,10 @@ static void nommu_addchr(o_string *o, int ch)
static void o_addstr_with_NUL(o_string *o, const char *str)
{
o_addblock(o, str, strlen(str) + 1);
size_t len = strlen(str) + 1;
if (len > INT_MAX)
bb_perror_msg_and_die(command_too_long_msg);
o_addblock(o, str, len);
}
/*