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[script] Remove arbitrary limit on script line lengths

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This commit is contained in:
Michael Brown 2008-06-18 00:43:58 +01:00
parent 0d91c37ce5
commit 0ea821c7b7
2 changed files with 36 additions and 28 deletions
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17
src/arch/i386/include/librm.h
View File

@ -210,6 +210,23 @@ strlen_user ( userptr_t buffer, off_t offset ) {
return strlen ( ( void * ) buffer + offset );
}
/**
* Find character in user buffer
*
* @v buffer User buffer
* @v offset Starting offset within buffer
* @v c Character to search for
* @v len Length of user buffer
* @ret offset Offset of character, or <0 if not found
*/
static inline __attribute__ (( always_inline )) off_t
memchr_user ( userptr_t buffer, off_t offset, int c, size_t len ) {
void *found;
found = memchr ( ( ( void * ) buffer + offset ), c, len );
return ( found ? ( found - ( void * ) buffer ) : -1 );
}
/**
* Convert virtual address to user buffer
*

47
src/image/script.c
View File

@ -37,11 +37,9 @@ struct image_type script_image_type __image_type ( PROBE_NORMAL );
* @ret rc Return status code
*/
static int script_exec ( struct image *image ) {
char cmdbuf[256];
size_t offset = 0;
size_t remaining;
off_t eol;
size_t len;
char *eol;
int rc;
/* Temporarily de-register image, so that a "boot" command
@ -53,36 +51,29 @@ static int script_exec ( struct image *image ) {
while ( offset < image->len ) {
/* Read up to cmdbuf bytes from script into buffer */
remaining = ( image->len - offset );
len = sizeof ( cmdbuf );
if ( len > remaining )
len = remaining;
memset ( cmdbuf, 0, sizeof ( cmdbuf ) );
copy_from_user ( cmdbuf, image->data, offset, len );
/* Find length of next line, excluding any terminating '\n' */
eol = memchr_user ( image->data, offset, '\n',
( image->len - offset ) );
if ( eol < 0 )
eol = image->len;
len = ( eol - offset );
/* Find end of line */
eol = memchr ( cmdbuf, '\n', sizeof ( cmdbuf ) );
if ( ! eol )
eol = memchr ( cmdbuf, '\0', sizeof ( cmdbuf ) );
if ( ! eol ) {
DBG ( "Script line too long (max %zd bytes)\n",
sizeof ( cmdbuf ) );
rc = -ENOEXEC;
goto done;
}
/* Copy line, terminate with NUL, and execute command */
{
char cmdbuf[ len + 1 ];
/* Mark end of line and execute command */
*eol = '\0';
DBG ( "$ %s\n", cmdbuf );
if ( ( rc = system ( cmdbuf ) ) != 0 ) {
DBG ( "Command \"%s\" failed: %s\n",
cmdbuf, strerror ( rc ) );
goto done;
copy_from_user ( cmdbuf, image->data, offset, len );
cmdbuf[len] = '\0';
DBG ( "$ %s\n", cmdbuf );
if ( ( rc = system ( cmdbuf ) ) != 0 ) {
DBG ( "Command \"%s\" failed: %s\n",
cmdbuf, strerror ( rc ) );
goto done;
}
}
/* Move to next line */
offset += ( ( eol - cmdbuf ) + 1 );
offset += ( len + 1 );
}
rc = 0;