*************************************************/
/* Copyright (c) University of Cambridge 1995 - 2018 */
-/* Copyright (c) The Exim maintainers 2019 - 2020 */
+/* Copyright (c) The Exim maintainers 2019 - 2021 */
/* See the file NOTICE for conditions of use and distribution. */
/* Exim gets and frees all its store through these functions. In the original
a single message transaction but needed for longer than the use of the main
pool permits. Currently this means only receive-time DKIM information.
+- There is a dedicated pool for configuration data read from the config file(s).
+ Once complete, it is made readonly.
+
. Orthogonal to the three pool types, there are two classes of memory: untainted
and tainted. The latter is used for values derived from untrusted input, and
the string-expansion mechanism refuses to operate on such values (obviously,
static const uschar * pooluse[NPOOLS] = {
[POOL_MAIN] = US"main",
[POOL_PERM] = US"perm",
+[POOL_CONFIG] = US"config",
[POOL_SEARCH] = US"search",
[POOL_MESSAGE] = US"message",
[POOL_TAINT_MAIN] = US"main",
[POOL_TAINT_PERM] = US"perm",
-[POOL_TAINT_SEARCH] = US"search",
+[POOL_TAINT_CONFIG] = US"config",
[POOL_TAINT_SEARCH] = US"search",
[POOL_TAINT_MESSAGE] = US"message",
};
static const uschar * poolclass[NPOOLS] = {
[POOL_MAIN] = US"untainted",
[POOL_PERM] = US"untainted",
+[POOL_CONFIG] = US"untainted",
[POOL_SEARCH] = US"untainted",
[POOL_MESSAGE] = US"untainted",
[POOL_TAINT_MAIN] = US"tainted",
[POOL_TAINT_PERM] = US"tainted",
+[POOL_TAINT_CONFIG] = US"tainted",
[POOL_TAINT_SEARCH] = US"tainted",
[POOL_TAINT_MESSAGE] = US"tainted",
};
+/******************************************************************************/
+void
+store_writeprotect(int pool)
+{
+#if !defined(COMPILE_UTILITY) && !defined(MISSING_POSIX_MEMALIGN)
+for (storeblock * b = chainbase[pool]; b; b = b->next)
+ if (mprotect(b, ALIGNED_SIZEOF_STOREBLOCK + b->length, PROT_READ) != 0)
+ DEBUG(D_any) debug_printf("config block mprotect: (%d) %s\n", errno, strerror(errno));
+#endif
+}
+
+/******************************************************************************/
+
/*************************************************
* Get a block from the current pool *
*************************************************/
does this to return a current watermark value for a later release of
allocated store. */
-if (size < 0)
- {
+if (size < 0 || size >= INT_MAX/2)
log_write(0, LOG_MAIN|LOG_PANIC_DIE,
"bad memory allocation requested (%d bytes) at %s %d",
size, func, linenumber);
- }
/* Round up the size to a multiple of the alignment. Although this looks a
messy statement, because "alignment" is a constant expression, the compiler can
if (++nblocks[pool] > maxblocks[pool])
maxblocks[pool] = nblocks[pool];
- newblock = internal_store_malloc(mlength, func, linenumber);
+#ifndef MISSING_POSIX_MEMALIGN
+ if (pool == POOL_CONFIG)
+ {
+ long pgsize = sysconf(_SC_PAGESIZE);
+ posix_memalign((void **)&newblock, pgsize, (mlength + pgsize - 1) & ~(pgsize - 1));
+ }
+ else
+#endif
+ newblock = internal_store_malloc(mlength, func, linenumber);
newblock->next = NULL;
newblock->length = length;
#ifndef RESTRICTED_MEMORY
int inc = newsize - oldsize;
int rounded_oldsize = oldsize;
-if (newsize < 0)
- {
+if (oldsize < 0 || newsize < oldsize || newsize >= INT_MAX/2)
log_write(0, LOG_MAIN|LOG_PANIC_DIE,
"bad memory extension requested (%d -> %d bytes) at %s %d",
oldsize, newsize, func, linenumber);
- }
/* Check that the block being extended was already of the required taint status;
refuse to extend if not. */
pools corresposding to store_pool are reset.
Arguments:
- r place to back up to
+ ptr place to back up to
+ pool pool holding the pointer
func function from which called
linenumber line number in source file
}
bb = b->next;
-b->next = NULL;
+if (pool != POOL_CONFIG)
+ b->next = NULL;
while ((b = bb))
{
nbytes[pool] -= siz;
pool_malloc -= siz;
nblocks[pool]--;
- internal_store_free(b, func, linenumber);
+ if (pool != POOL_CONFIG)
+ internal_store_free(b, func, linenumber);
#ifndef RESTRICTED_MEMORY
if (store_block_order[pool] > 13) store_block_order[pool]--;
die_tainted(US"store_newblock", CUS func, linenumber);
#endif
+if (len < 0 || len > newsize)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "bad memory extension requested (%d -> %d bytes) at %s %d",
+ len, newsize, func, linenumber);
+
newtext = store_get(newsize, tainted);
memcpy(newtext, block, len);
if (release_ok) store_release_3(block, pool, func, linenumber);
{
void * yield;
+if (size < 0 || size >= INT_MAX/2)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "bad memory allocation requested (%d bytes) at %s %d",
+ size, func, line);
+
size += sizeof(int); /* space to store the size, used under debug */
if (size < 16) size = 16;