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expand_name fixes:

Browse Source 
.) don't use MAXPATHLEN + 1, fix logic to compensate.
.) style(9) function parameters.
.) fix line wrapping.
.) remove duplicated error and string handling code.
.) don't NUL terminate already NUL terminated string.
.) all string length variables changed from int to size_t.
.) constify variables.
.) catch when corename would be truncated.
.) cast pid_t and uid_t args for format string.
.) add parens around return arguments.

Help and suggestions from: bde
This commit is contained in:
Alfred Perlstein 2002-05-08 09:06:47 +00:00
parent 7098979e16
commit 8b43b53530
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=96215
1 changed files with 32 additions and 38 deletions
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70
sys/kern/kern_sig.c
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@ -1879,68 +1879,62 @@ SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RW, corefilename,
static char *
expand_name(name, uid, pid)
const char *name; uid_t uid; pid_t pid; {
const char *name;
uid_t uid;
pid_t pid;
{
const char *format, *appendstr;
char *temp;
char buf[11]; /* Buffer for pid/uid -- max 4B */
int i, n;
char *format = corefilename;
size_t namelen;
size_t i, l, n;
temp = malloc(MAXPATHLEN + 1, M_TEMP, M_NOWAIT | M_ZERO);
format = corefilename;
temp = malloc(MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO);
if (temp == NULL)
return NULL;
namelen = strlen(name);
return (NULL);
for (i = 0, n = 0; n < MAXPATHLEN && format[i]; i++) {
int l;
switch (format[i]) {
case '%': /* Format character */
i++;
switch (format[i]) {
case '%':
temp[n++] = '%';
appendstr = "%";
break;
case 'N': /* process name */
if ((n + namelen) > MAXPATHLEN) {
log(LOG_ERR, "pid %d (%s), uid (%u): Path `%s%s' is too long\n",
pid, name, uid, temp, name);
free(temp, M_TEMP);
return NULL;
}
memcpy(temp+n, name, namelen);
n += namelen;
appendstr = name;
break;
case 'P': /* process id */
l = sprintf(buf, "%u", pid);
if ((n + l) > MAXPATHLEN) {
log(LOG_ERR, "pid %d (%s), uid (%u): Path `%s%s' is too long\n",
pid, name, uid, temp, name);
free(temp, M_TEMP);
return NULL;
}
memcpy(temp+n, buf, l);
n += l;
sprintf(buf, "%u", pid);
appendstr = buf;
break;
case 'U': /* user id */
l = sprintf(buf, "%u", uid);
if ((n + l) > MAXPATHLEN) {
log(LOG_ERR, "pid %d (%s), uid (%u): Path `%s%s' is too long\n",
pid, name, uid, temp, name);
free(temp, M_TEMP);
return NULL;
}
memcpy(temp+n, buf, l);
n += l;
sprintf(buf, "%u", uid);
appendstr = buf;
break;
default:
log(LOG_ERR, "Unknown format character %c in `%s'\n", format[i], format);
appendstr = "";
log(LOG_ERR,
"Unknown format character %c in `%s'\n",
format[i], format);
}
l = strlen(appendstr);
if ((n + l) >= MAXPATHLEN)
goto toolong;
memcpy(temp + n, appendstr, l);
n += l;
break;
default:
temp[n++] = format[i];
}
}
temp[n] = '\0';
return temp;
if (format[i] != '\0')
goto toolong;
return (temp);
toolong:
log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too long\n",
(long)pid, name, (u_long)uid);
free(temp, M_TEMP);
return (NULL);
}
/*