Copyright (C) Andrew Tridgell 1999-2005
Copyright (C) Paul `Rusty' Russell 2000
Copyright (C) Jeremy Allison 2000-2003
-
+
** NOTE! The following LGPL license applies to the tdb
** library. This does NOT imply that all of Samba is released
** under the LGPL
-
+
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
/* check for an out of bounds access - if it is out of bounds then
see if the database has been expanded by someone else and expand
if necessary
- note that "len" is the minimum length needed for the db
*/
-static int tdb_oob(struct tdb_context *tdb, tdb_off_t len, int probe)
+static int tdb_oob(struct tdb_context *tdb, tdb_off_t off, tdb_len_t len,
+ int probe)
{
struct stat st;
- if (len <= tdb->map_size)
+ if (len + off < len) {
+ if (!probe) {
+ /* Ensure ecode is set for log fn. */
+ tdb->ecode = TDB_ERR_IO;
+ TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_oob off %d len %d wrap\n",
+ (int)off, (int)len));
+ }
+ return -1;
+ }
+
+ if (off + len <= tdb->map_size)
return 0;
if (tdb->flags & TDB_INTERNAL) {
if (!probe) {
/* Ensure ecode is set for log fn. */
tdb->ecode = TDB_ERR_IO;
- TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_oob len %d beyond internal malloc size %d\n",
- (int)len, (int)tdb->map_size));
+ TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_oob len %u beyond internal malloc size %u\n",
+ (int)(off + len), (int)tdb->map_size));
}
return -1;
}
return -1;
}
- if (st.st_size < (size_t)len) {
+ if (st.st_size < (size_t)off + len) {
if (!probe) {
/* Ensure ecode is set for log fn. */
tdb->ecode = TDB_ERR_IO;
- TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_oob len %d beyond eof at %d\n",
- (int)len, (int)st.st_size));
+ TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_oob len %u beyond eof at %u\n",
+ (int)(off + len), (int)st.st_size));
}
return -1;
}
+ /* Beware >4G files! */
+ if ((tdb_off_t)st.st_size != st.st_size) {
+ /* Ensure ecode is set for log fn. */
+ tdb->ecode = TDB_ERR_IO;
+ TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_oob len %llu too large!\n",
+ (long long)st.st_size));
+ return -1;
+ }
+
/* Unmap, update size, remap */
if (tdb_munmap(tdb) == -1) {
tdb->ecode = TDB_ERR_IO;
return -1;
}
- if (tdb->methods->tdb_oob(tdb, off + len, 0) != 0)
+ if (tdb->methods->tdb_oob(tdb, off, len, 0) != 0)
return -1;
if (tdb->map_ptr) {
static int tdb_read(struct tdb_context *tdb, tdb_off_t off, void *buf,
tdb_len_t len, int cv)
{
- if (tdb->methods->tdb_oob(tdb, off + len, 0) != 0) {
+ if (tdb->methods->tdb_oob(tdb, off, len, 0) != 0) {
return -1;
}
file and doing the mmap again if necessary */
int tdb_expand(struct tdb_context *tdb, tdb_off_t size)
{
- struct list_struct rec;
- tdb_off_t offset, new_size;
+ struct tdb_record rec;
+ tdb_off_t offset, new_size, top_size, map_size;
if (tdb_lock(tdb, -1, F_WRLCK) == -1) {
TDB_LOG((tdb, TDB_DEBUG_ERROR, "lock failed in tdb_expand\n"));
}
/* must know about any previous expansions by another process */
- tdb->methods->tdb_oob(tdb, tdb->map_size + 1, 1);
+ tdb->methods->tdb_oob(tdb, tdb->map_size, 1, 1);
+
+ /* limit size in order to avoid using up huge amounts of memory for
+ * in memory tdbs if an oddball huge record creeps in */
+ if (size > 100 * 1024) {
+ top_size = tdb->map_size + size * 2;
+ } else {
+ top_size = tdb->map_size + size * 100;
+ }
+
+ /* always make room for at least top_size more records, and at
+ least 25% more space. if the DB is smaller than 100MiB,
+ otherwise grow it by 10% only. */
+ if (tdb->map_size > 100 * 1024 * 1024) {
+ map_size = tdb->map_size * 1.10;
+ } else {
+ map_size = tdb->map_size * 1.25;
+ }
- /* always make room for at least 100 more records, and at
- least 25% more space. Round the database up to a multiple
- of the page size */
- new_size = MAX(tdb->map_size + size*100, tdb->map_size * 1.25);
+ /* Round the database up to a multiple of the page size */
+ new_size = MAX(top_size, map_size);
size = TDB_ALIGN(new_size, tdb->page_size) - tdb->map_size;
if (!(tdb->flags & TDB_INTERNAL))
* Optimize by avoiding the malloc/memcpy/free, point the
* parser directly at the mmap area.
*/
- if (tdb->methods->tdb_oob(tdb, offset+len, 0) != 0) {
+ if (tdb->methods->tdb_oob(tdb, offset, len, 0) != 0) {
return -1;
}
data.dptr = offset + (unsigned char *)tdb->map_ptr;
}
/* read/write a record */
-int tdb_rec_read(struct tdb_context *tdb, tdb_off_t offset, struct list_struct *rec)
+int tdb_rec_read(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec)
{
if (tdb->methods->tdb_read(tdb, offset, rec, sizeof(*rec),DOCONV()) == -1)
return -1;
TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_rec_read bad magic 0x%x at offset=%d\n", rec->magic, offset));
return -1;
}
- return tdb->methods->tdb_oob(tdb, rec->next+sizeof(*rec), 0);
+ return tdb->methods->tdb_oob(tdb, rec->next, sizeof(*rec), 0);
}
-int tdb_rec_write(struct tdb_context *tdb, tdb_off_t offset, struct list_struct *rec)
+int tdb_rec_write(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec)
{
- struct list_struct r = *rec;
+ struct tdb_record r = *rec;
return tdb->methods->tdb_write(tdb, offset, CONVERT(r), sizeof(r));
}
tdb_next_hash_chain,
tdb_oob,
tdb_expand_file,
- tdb_brlock
};
/*
git.samba.org / mat / samba.git / blobdiff