* Exim - an Internet mail transport agent *
*************************************************/
+/* Copyright (c) The Exim maintainers 2019 - 2022 */
/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Exim gets and frees all its store through these functions. In the original
implementation there was a lot of mallocing and freeing of small bits of store.
. There is a separate pool (POOL_SEARCH) that is used only for lookup storage.
This means it can be freed when search_tidyup() is called to close down all
the lookup caching.
+
+- There is another pool (POOL_MESSAGE) used for medium-lifetime objects; within
+ 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.
+
+- There are pools for each active combination of lookup-quoting, dynamically created.
+
+. Orthogonal to the four main 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,
+ it can expand an untainted value to return a tainted result). The classes
+ are implemented by duplicating the four pool types. Pool resets are requested
+ against the nontainted sibling and apply to both siblings.
+
+ Only memory blocks requested for tainted use are regarded as tainted; anything
+ else (including stack auto variables) is untainted. Care is needed when coding
+ to not copy untrusted data into untainted memory, as downstream taint-checks
+ would be avoided.
+
+ Intermediate layers (eg. the string functions) can test for taint, and use this
+ for ensurinng that results have proper state. For example the
+ string_vformat_trc() routing supporting the string_sprintf() interface will
+ recopy a string being built into a tainted allocation if it meets a %s for a
+ tainted argument. Any intermediate-layer function that (can) return a new
+ allocation should behave this way; returning a tainted result if any tainted
+ content is used. Intermediate-layer functions (eg. Ustrncpy) that modify
+ existing allocations fail if tainted data is written into an untainted area.
+ Users of functions that modify existing allocations should check if a tainted
+ source and an untainted destination is used, and fail instead (sprintf() being
+ the classic case).
*/
/* keep config.h before memcheck.h, for NVALGRIND */
#include "config.h"
+#include <sys/mman.h>
#include "memcheck.h"
appears (I checked that gcc does do this). */
#define alignment \
- ((sizeof(void *) > sizeof(double))? sizeof(void *) : sizeof(double))
-
-/* Size of block to get from malloc to carve up into smaller ones. This
-must be a multiple of the alignment. We assume that 8192 is going to be
-suitably aligned. */
-
-#define STORE_BLOCK_SIZE 8192
+ (sizeof(void *) > sizeof(double) ? sizeof(void *) : sizeof(double))
/* store_reset() will not free the following block if the last used block has
less than this much left in it. */
size_t length;
} storeblock;
+/* Pool descriptor struct */
+
+typedef struct pooldesc {
+ storeblock * chainbase; /* list of blocks in pool */
+ storeblock * current_block; /* top block, still with free space */
+ void * next_yield; /* next allocation point */
+ int yield_length; /* remaining space in current block */
+ unsigned store_block_order; /* log2(size) block allocation size */
+
+ /* This variable is set by store_get() to its yield, and by store_reset() to
+ NULL. This enables string_cat() to optimize its store handling for very long
+ strings. That's why the variable is global. */
+
+ void * store_last_get;
+
+ /* These are purely for stats-gathering */
+
+ int nbytes;
+ int maxbytes;
+ int nblocks;
+ int maxblocks;
+ unsigned maxorder;
+} pooldesc;
+
+/* Enhanced pool descriptor for quoted pools */
+
+typedef struct quoted_pooldesc {
+ pooldesc pool;
+ unsigned quoter;
+ struct quoted_pooldesc * next;
+} quoted_pooldesc;
+
/* Just in case we find ourselves on a system where the structure above has a
length that is not a multiple of the alignment, set up a macro for the padded
length. */
#define ALIGNED_SIZEOF_STOREBLOCK \
(((sizeof(storeblock) + alignment - 1) / alignment) * alignment)
+/* Size of block to get from malloc to carve up into smaller ones. This
+must be a multiple of the alignment. We assume that 4096 is going to be
+suitably aligned. Double the size per-pool for every malloc, to mitigate
+certain denial-of-service attacks. Don't bother to decrease on block frees.
+We waste average half the current alloc size per pool. This could be several
+hundred kB now, vs. 4kB with a constant-size block size. But the search time
+for is_tainted(), linear in the number of blocks for the pool, is O(n log n)
+rather than O(n^2).
+A test of 2000 RCPTs and just accept ACL had 370kB in 21 blocks before,
+504kB in 6 blocks now, for the untainted-main (largest) pool.
+Builds for restricted-memory system can disable the expansion by
+defining RESTRICTED_MEMORY */
+/*XXX should we allow any for malloc's own overhead? But how much? */
+
+/* #define RESTRICTED_MEMORY */
+#define STORE_BLOCK_SIZE(order) ((1U << (order)) - ALIGNED_SIZEOF_STOREBLOCK)
+
/* Variables holding data for the local pools of store. The current pool number
is held in store_pool, which is global so that it can be changed from outside.
Setting the initial length values to -1 forces a malloc for the first call,
even if the length is zero (which is used for getting a point to reset to). */
-int store_pool = POOL_PERM;
+int store_pool = POOL_MAIN;
+
+pooldesc paired_pools[N_PAIRED_POOLS];
+quoted_pooldesc * quoted_pools = NULL;
-static storeblock *chainbase[3] = { NULL, NULL, NULL };
-static storeblock *current_block[3] = { NULL, NULL, NULL };
-static void *next_yield[3] = { NULL, NULL, NULL };
-static int yield_length[3] = { -1, -1, -1 };
+static int n_nonpool_blocks; /* current number of direct store_malloc() blocks */
+static int max_nonpool_blocks;
+static int max_pool_malloc; /* max value for pool_malloc */
+static int max_nonpool_malloc; /* max value for nonpool_malloc */
/* pool_malloc holds the amount of memory used by the store pools; this goes up
and down as store is reset or released. nonpool_malloc is the total got by
malloc from other calls; this doesn't go down because it is just freed by
pointer. */
-static int pool_malloc = 0;
-static int nonpool_malloc = 0;
+static int pool_malloc;
+static int nonpool_malloc;
-/* This variable is set by store_get() to its yield, and by store_reset() to
-NULL. This enables string_cat() to optimize its store handling for very long
-strings. That's why the variable is global. */
-void *store_last_get[3] = { NULL, NULL, NULL };
+#ifndef COMPILE_UTILITY
+static const uschar * pooluse[N_PAIRED_POOLS] = {
+[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_CONFIG] = US"config",
+[POOL_TAINT_SEARCH] = US"search",
+[POOL_TAINT_MESSAGE] = US"message",
+};
+static const uschar * poolclass[N_PAIRED_POOLS] = {
+[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",
+};
+#endif
+static void * internal_store_malloc(size_t, const char *, int);
+static void internal_store_free(void *, const char *, int linenumber);
-/*************************************************
-* Get a block from the current pool *
-*************************************************/
+/******************************************************************************/
-/* Running out of store is a total disaster. This function is called via the
-macro store_get(). It passes back a block of store within the current big
-block, getting a new one if necessary. The address is saved in
-store_last_was_get.
+static void
+pool_init(pooldesc * pp)
+{
+memset(pp, 0, sizeof(*pp));
+pp->yield_length = -1;
+pp->store_block_order = 12; /* log2(allocation_size) ie. 4kB */
+}
-Arguments:
- size amount wanted
- filename source file from which called
- linenumber line number in source file.
+/* Initialisation, for things fragile with parameter channges when using
+static initialisers. */
-Returns: pointer to store (panic on malloc failure)
+void
+store_init(void)
+{
+for (pooldesc * pp = paired_pools; pp < paired_pools + N_PAIRED_POOLS; pp++)
+ pool_init(pp);
+}
+
+/******************************************************************************/
+/* Locating elements given memory pointer */
+
+static BOOL
+is_pointer_in_block(const storeblock * b, const void * p)
+{
+uschar * bc = US b + ALIGNED_SIZEOF_STOREBLOCK;
+return US p >= bc && US p < bc + b->length;
+}
+
+static pooldesc *
+pool_current_for_pointer(const void * p)
+{
+storeblock * b;
+
+for (quoted_pooldesc * qp = quoted_pools; qp; qp = qp->next)
+ if ((b = qp->pool.current_block) && is_pointer_in_block(b, p))
+ return &qp->pool;
+
+for (pooldesc * pp = paired_pools; pp < paired_pools + N_PAIRED_POOLS; pp++)
+ if ((b = pp->current_block) && is_pointer_in_block(b, p))
+ return pp;
+return NULL;
+}
+
+static pooldesc *
+pool_for_pointer(const void * p, const char * func, int linenumber)
+{
+pooldesc * pp;
+storeblock * b;
+
+if ((pp = pool_current_for_pointer(p))) return pp;
+
+for (quoted_pooldesc * qp = quoted_pools; qp; qp = qp->next)
+ for (b = qp->pool.chainbase; b; b = b->next)
+ if (is_pointer_in_block(b, p)) return &qp->pool;
+
+for (pp = paired_pools; pp < paired_pools + N_PAIRED_POOLS; pp++)
+ for (b = pp->chainbase; b; b = b->next)
+ if (is_pointer_in_block(b, p)) return pp;
+
+#ifndef COMPILE_UTILITY
+stackdump();
+#endif
+log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "bad memory reference; pool not found, at %s %d", func, linenumber);
+return NULL;
+}
+
+/******************************************************************************/
+/* Test if a pointer refers to tainted memory.
+
+Slower version check, for use when platform intermixes malloc and mmap area
+addresses. Test against the current-block of all tainted pools first, then all
+blocks of all tainted pools.
+
+Return: TRUE iff tainted
*/
-void *
-store_get_3(int size, const char *filename, int linenumber)
+BOOL
+is_tainted_fn(const void * p)
+{
+storeblock * b;
+
+if (p == GET_UNTAINTED) return FALSE;
+if (p == GET_TAINTED) return TRUE;
+
+for (pooldesc * pp = paired_pools + POOL_TAINT_BASE;
+ pp < paired_pools + N_PAIRED_POOLS; pp++)
+ if ((b = pp->current_block))
+ if (is_pointer_in_block(b, p)) return TRUE;
+
+for (quoted_pooldesc * qp = quoted_pools; qp; qp = qp->next)
+ if (b = qp->pool.current_block)
+ if (is_pointer_in_block(b, p)) return TRUE;
+
+for (pooldesc * pp = paired_pools + POOL_TAINT_BASE;
+ pp < paired_pools + N_PAIRED_POOLS; pp++)
+ for (b = pp->chainbase; b; b = b->next)
+ if (is_pointer_in_block(b, p)) return TRUE;
+
+for (quoted_pooldesc * qp = quoted_pools; qp; qp = qp->next)
+ for (b = qp->pool.chainbase; b; b = b->next)
+ if (is_pointer_in_block(b, p)) return TRUE;
+
+return FALSE;
+}
+
+
+void
+die_tainted(const uschar * msg, const uschar * func, int line)
{
+log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Taint mismatch, %s: %s %d\n",
+ msg, func, line);
+}
+
+
+#ifndef COMPILE_UTILITY
+/* Return the pool for the given quoter, or null */
+
+static pooldesc *
+pool_for_quoter(unsigned quoter)
+{
+for (quoted_pooldesc * qp = quoted_pools; qp; qp = qp->next)
+ if (qp->quoter == quoter)
+ return &qp->pool;
+return NULL;
+}
+
+/* Allocate/init a new quoted-pool and return the pool */
+
+static pooldesc *
+quoted_pool_new(unsigned quoter)
+{
+// debug_printf("allocating quoted-pool\n");
+quoted_pooldesc * qp = store_get_perm(sizeof(quoted_pooldesc), GET_UNTAINTED);
+
+pool_init(&qp->pool);
+qp->quoter = quoter;
+qp->next = quoted_pools;
+quoted_pools = qp;
+return &qp->pool;
+}
+#endif
+
+
+/******************************************************************************/
+void
+store_writeprotect(int pool)
+{
+#if !defined(COMPILE_UTILITY) && !defined(MISSING_POSIX_MEMALIGN)
+for (storeblock * b = paired_pools[pool].chainbase; 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
+}
+
+/******************************************************************************/
+
+static void *
+pool_get(pooldesc * pp, int size, BOOL align_mem, const char * func, int linenumber)
+{
+/* Ensure we've been asked to allocate memory.
+A negative size is a sign of a security problem.
+A zero size might be also suspect, but our internal usage deliberately
+does this to return a current watermark value for a later release of
+allocated store. */
+
+if (size < 0 || size >= INT_MAX/2)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "bad memory allocation requested (%d bytes) from %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
do a reasonable job of optimizing, especially if the value of "alignment" is a
size is STORE_BLOCK_SIZE, and we would expect this to be the norm, since
these functions are mostly called for small amounts of store. */
-if (size > yield_length[store_pool])
+if (size > pp->yield_length)
{
- int length = (size <= STORE_BLOCK_SIZE)? STORE_BLOCK_SIZE : size;
+ int length = MAX(
+ STORE_BLOCK_SIZE(pp->store_block_order) - ALIGNED_SIZEOF_STOREBLOCK,
+ size);
int mlength = length + ALIGNED_SIZEOF_STOREBLOCK;
- storeblock * newblock = NULL;
+ storeblock * newblock;
/* Sometimes store_reset() may leave a block for us; check if we can use it */
- if ( (newblock = current_block[store_pool])
+ if ( (newblock = pp->current_block)
&& (newblock = newblock->next)
&& newblock->length < length
)
{
/* Give up on this block, because it's too small */
- store_free(newblock);
+ pp->nblocks--;
+ internal_store_free(newblock, func, linenumber);
newblock = NULL;
}
if (!newblock)
{
- pool_malloc += mlength; /* Used in pools */
- nonpool_malloc -= mlength; /* Exclude from overall total */
- newblock = store_malloc(mlength);
+ if ((pp->nbytes += mlength) > pp->maxbytes)
+ pp->maxbytes = pp->nbytes;
+ if ((pool_malloc += mlength) > max_pool_malloc) /* Used in pools */
+ max_pool_malloc = pool_malloc;
+ nonpool_malloc -= mlength; /* Exclude from overall total */
+ if (++pp->nblocks > pp->maxblocks)
+ pp->maxblocks = pp->nblocks;
+
+#ifndef MISSING_POSIX_MEMALIGN
+ if (align_mem)
+ {
+ long pgsize = sysconf(_SC_PAGESIZE);
+ int err = posix_memalign((void **)&newblock,
+ pgsize, (mlength + pgsize - 1) & ~(pgsize - 1));
+ if (err)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "failed to alloc (using posix_memalign) %d bytes of memory: '%s'"
+ "called from line %d in %s",
+ size, strerror(err), linenumber, func);
+ }
+ else
+#endif
+ newblock = internal_store_malloc(mlength, func, linenumber);
newblock->next = NULL;
newblock->length = length;
- if (!chainbase[store_pool])
- chainbase[store_pool] = newblock;
+#ifndef RESTRICTED_MEMORY
+ if (pp->store_block_order++ > pp->maxorder)
+ pp->maxorder = pp->store_block_order;
+#endif
+
+ if (! pp->chainbase)
+ pp->chainbase = newblock;
else
- current_block[store_pool]->next = newblock;
+ pp->current_block->next = newblock;
}
- current_block[store_pool] = newblock;
- yield_length[store_pool] = newblock->length;
- next_yield[store_pool] =
- (void *)(CS current_block[store_pool] + ALIGNED_SIZEOF_STOREBLOCK);
- (void) VALGRIND_MAKE_MEM_NOACCESS(next_yield[store_pool], yield_length[store_pool]);
+ pp->current_block = newblock;
+ pp->yield_length = newblock->length;
+ pp->next_yield =
+ (void *)(CS pp->current_block + ALIGNED_SIZEOF_STOREBLOCK);
+ (void) VALGRIND_MAKE_MEM_NOACCESS(pp->next_yield, pp->yield_length);
}
/* There's (now) enough room in the current block; the yield is the next
pointer. */
-store_last_get[store_pool] = next_yield[store_pool];
+pp->store_last_get = pp->next_yield;
-/* Cut out the debugging stuff for utilities, but stop picky compilers from
-giving warnings. */
+(void) VALGRIND_MAKE_MEM_UNDEFINED(pp->store_last_get, size);
+/* Update next pointer and number of bytes left in the current block. */
-#ifdef COMPILE_UTILITY
-filename = filename;
-linenumber = linenumber;
-#else
-DEBUG(D_memory)
- {
- if (f.running_in_test_harness)
- debug_printf("---%d Get %5d\n", store_pool, size);
- else
- debug_printf("---%d Get %6p %5d %-14s %4d\n", store_pool,
- store_last_get[store_pool], size, filename, linenumber);
- }
-#endif /* COMPILE_UTILITY */
+pp->next_yield = (void *)(CS pp->next_yield + size);
+pp->yield_length -= size;
+return pp->store_last_get;
+}
-(void) VALGRIND_MAKE_MEM_UNDEFINED(store_last_get[store_pool], size);
-/* Update next pointer and number of bytes left in the current block. */
+/*************************************************
+* Get a block from the current pool *
+*************************************************/
-next_yield[store_pool] = (void *)(CS next_yield[store_pool] + size);
-yield_length[store_pool] -= size;
+/* Running out of store is a total disaster. This function is called via the
+macro store_get(). The current store_pool is used, adjusting for taint.
+If the protoype is quoted, use a quoted-pool.
+Return a block of store within the current big block of the pool, getting a new
+one if necessary. The address is saved in store_last_get for the pool.
-return store_last_get[store_pool];
+Arguments:
+ size amount wanted, bytes
+ proto_mem class: get store conformant to this
+ Special values: 0 forces untainted, 1 forces tainted
+ func function from which called
+ linenumber line number in source file
+
+Returns: pointer to store (panic on malloc failure)
+*/
+
+void *
+store_get_3(int size, const void * proto_mem, const char * func, int linenumber)
+{
+#ifndef COMPILE_UTILITY
+int quoter = quoter_for_address(proto_mem);
+#endif
+pooldesc * pp;
+void * yield;
+
+#ifndef COMPILE_UTILITY
+if (!is_real_quoter(quoter))
+#endif
+ {
+ BOOL tainted = is_tainted(proto_mem);
+ int pool = tainted ? store_pool + POOL_TAINT_BASE : store_pool;
+ pp = paired_pools + pool;
+ yield = pool_get(pp, size, (pool == POOL_CONFIG), func, linenumber);
+
+ /* Cut out the debugging stuff for utilities, but stop picky compilers from
+ giving warnings. */
+
+#ifndef COMPILE_UTILITY
+ DEBUG(D_memory)
+ debug_printf("---%d Get %6p %5d %-14s %4d\n", pool,
+ pp->store_last_get, size, func, linenumber);
+#endif
+ }
+#ifndef COMPILE_UTILITY
+else
+ {
+ DEBUG(D_memory)
+ debug_printf("allocating quoted-block for quoter %u (from %s %d)\n",
+ quoter, func, linenumber);
+ if (!(pp = pool_for_quoter(quoter))) pp = quoted_pool_new(quoter);
+ yield = pool_get(pp, size, FALSE, func, linenumber);
+ DEBUG(D_memory)
+ debug_printf("---QQ Get %6p %5d %-14s %4d\n",
+ pp->store_last_get, size, func, linenumber);
+ }
+#endif
+return yield;
}
Arguments:
size amount wanted
- filename source file from which called
- linenumber line number in source file.
+ proto_mem class: get store conformant to this
+ func function from which called
+ linenumber line number in source file
Returns: pointer to store (panic on malloc failure)
*/
void *
-store_get_perm_3(int size, const char *filename, int linenumber)
+store_get_perm_3(int size, const void * proto_mem, const char * func, int linenumber)
{
-void *yield;
+void * yield;
int old_pool = store_pool;
store_pool = POOL_PERM;
-yield = store_get_3(size, filename, linenumber);
+yield = store_get_3(size, proto_mem, func, linenumber);
store_pool = old_pool;
return yield;
}
+#ifndef COMPILE_UTILITY
+/*************************************************
+* Get a block annotated as being lookup-quoted *
+*************************************************/
+
+/* Allocate from pool a pool consistent with the proto_mem augmented by the
+requested quoter type.
+
+XXX currently not handling mark/release
+
+Args: size number of bytes to allocate
+ quoter id for the quoting type
+ func caller, for debug
+ linenumber caller, for debug
+
+Return: allocated memory block
+*/
+
+static void *
+store_force_get_quoted(int size, unsigned quoter,
+ const char * func, int linenumber)
+{
+pooldesc * pp = pool_for_quoter(quoter);
+void * yield;
+
+DEBUG(D_memory)
+ debug_printf("allocating quoted-block for quoter %u (from %s %d)\n", quoter, func, linenumber);
+
+if (!pp) pp = quoted_pool_new(quoter);
+yield = pool_get(pp, size, FALSE, func, linenumber);
+
+DEBUG(D_memory)
+ debug_printf("---QQ Get %6p %5d %-14s %4d\n",
+ pp->store_last_get, size, func, linenumber);
+
+return yield;
+}
+
+/* Maybe get memory for the specified quoter, but only if the
+prototype memory is tainted. Otherwise, get plain memory.
+*/
+void *
+store_get_quoted_3(int size, const void * proto_mem, unsigned quoter,
+ const char * func, int linenumber)
+{
+// debug_printf("store_get_quoted_3: quoter %u\n", quoter);
+return is_tainted(proto_mem)
+ ? store_force_get_quoted(size, quoter, func, linenumber)
+ : store_get_3(size, proto_mem, func, linenumber);
+}
+
+/* Return quoter for given address, or -1 if not in a quoted-pool. */
+int
+quoter_for_address(const void * p)
+{
+for (quoted_pooldesc * qp = quoted_pools; qp; qp = qp->next)
+ {
+ pooldesc * pp = &qp->pool;
+ storeblock * b;
+
+ if (b = pp->current_block)
+ if (is_pointer_in_block(b, p))
+ return qp->quoter;
+
+ for (b = pp->chainbase; b; b = b->next)
+ if (is_pointer_in_block(b, p))
+ return qp->quoter;
+ }
+return -1;
+}
+
+/* Return TRUE iff the given address is quoted for the given type.
+There is extra complexity to handle lookup providers with multiple
+find variants but shared quote functions. */
+BOOL
+is_quoted_like(const void * p, unsigned quoter)
+{
+int pq = quoter_for_address(p);
+BOOL y =
+ is_real_quoter(pq) && lookup_list[pq]->quote == lookup_list[quoter]->quote;
+/* debug_printf("is_quoted(%p, %u): %c\n", p, quoter, y?'T':'F'); */
+return y;
+}
+
+/* Return TRUE if the quoter value indicates an actual quoter */
+BOOL
+is_real_quoter(int quoter)
+{
+return quoter >= 0;
+}
+
+/* Return TRUE if the "new" data requires that the "old" data
+be recopied to new-class memory. We order the classes as
+
+ 2: tainted, not quoted
+ 1: quoted (which is also tainted)
+ 0: untainted
+
+If the "new" is higher-order than the "old", they are not compatible
+and a copy is needed. If both are quoted, but the quoters differ,
+not compatible. Otherwise they are compatible.
+*/
+BOOL
+is_incompatible_fn(const void * old, const void * new)
+{
+int oq, nq;
+unsigned oi, ni;
+
+ni = is_real_quoter(nq = quoter_for_address(new)) ? 1 : is_tainted(new) ? 2 : 0;
+oi = is_real_quoter(oq = quoter_for_address(old)) ? 1 : is_tainted(old) ? 2 : 0;
+return ni > oi || ni == oi && nq != oq;
+}
+
+#endif /*!COMPILE_UTILITY*/
/*************************************************
* Extend a block if it is at the top *
/* While reading strings of unknown length, it is often the case that the
string is being read into the block at the top of the stack. If it needs to be
-extended, it is more efficient just to extend the top block rather than
+extended, it is more efficient just to extend within the top block rather than
allocate a new block and then have to copy the data. This function is provided
for the use of string_cat(), but of course can be used elsewhere too.
+The block itself is not expanded; only the top allocation from it.
Arguments:
ptr pointer to store block
oldsize current size of the block, as requested by user
newsize new size required
- filename source file from which called
+ func function from which called
linenumber line number in source file
Returns: TRUE if the block is at the top of the stack and has been
extended; FALSE if it isn't at the top of the stack, or cannot
be extended
+
+XXX needs extension for quoted-tracking. This assumes that the global store_pool
+is the one to alloc from, which breaks with separated pools.
*/
BOOL
-store_extend_3(void *ptr, int oldsize, int newsize, const char *filename,
- int linenumber)
+store_extend_3(void * ptr, int oldsize, int newsize,
+ const char * func, int linenumber)
{
+pooldesc * pp = pool_for_pointer(ptr, func, linenumber);
int inc = newsize - oldsize;
int rounded_oldsize = oldsize;
+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);
+
if (rounded_oldsize % alignment != 0)
rounded_oldsize += alignment - (rounded_oldsize % alignment);
-if (CS ptr + rounded_oldsize != CS (next_yield[store_pool]) ||
- inc > yield_length[store_pool] + rounded_oldsize - oldsize)
+if (CS ptr + rounded_oldsize != CS (pp->next_yield) ||
+ inc > pp->yield_length + rounded_oldsize - oldsize)
return FALSE;
/* Cut out the debugging stuff for utilities, but stop picky compilers from
giving warnings. */
-#ifdef COMPILE_UTILITY
-filename = filename;
-linenumber = linenumber;
-#else
+#ifndef COMPILE_UTILITY
DEBUG(D_memory)
{
- if (f.running_in_test_harness)
- debug_printf("---%d Ext %5d\n", store_pool, newsize);
- else
- debug_printf("---%d Ext %6p %5d %-14s %4d\n", store_pool, ptr, newsize,
- filename, linenumber);
+ quoted_pooldesc * qp;
+ for (qp = quoted_pools; qp; qp = qp->next)
+ if (pp == &qp->pool)
+ {
+ debug_printf("---Q%d Ext %6p %5d %-14s %4d\n",
+ (int)(qp - quoted_pools),
+ ptr, newsize, func, linenumber);
+ break;
+ }
+ if (!qp)
+ debug_printf("---%d Ext %6p %5d %-14s %4d\n",
+ (int)(pp - paired_pools),
+ ptr, newsize, func, linenumber);
}
#endif /* COMPILE_UTILITY */
if (newsize % alignment != 0) newsize += alignment - (newsize % alignment);
-next_yield[store_pool] = CS ptr + newsize;
-yield_length[store_pool] -= newsize - rounded_oldsize;
+pp->next_yield = CS ptr + newsize;
+pp->yield_length -= newsize - rounded_oldsize;
(void) VALGRIND_MAKE_MEM_UNDEFINED(ptr + oldsize, inc);
return TRUE;
}
+static BOOL
+is_pwr2_size(int len)
+{
+unsigned x = len;
+return (x & (x - 1)) == 0;
+}
+
+
/*************************************************
* Back up to a previous point on the stack *
*************************************************/
/* This function resets the next pointer, freeing any subsequent whole blocks
-that are now unused. Normally it is given a pointer that was the yield of a
-call to store_get, and is therefore aligned, but it may be given an offset
-after such a pointer in order to release the end of a block and anything that
-follows.
+that are now unused. Call with a cookie obtained from store_mark() only; do
+not call with a pointer returned by store_get(). Both the untainted and tainted
+pools corresposding to store_pool are reset.
+
+Quoted pools are not handled.
Arguments:
ptr place to back up to
- filename source file from which called
+ pool pool holding the pointer
+ func function from which called
linenumber line number in source file
Returns: nothing
*/
-void
-store_reset_3(void *ptr, const char *filename, int linenumber)
+static void
+internal_store_reset(void * ptr, int pool, const char *func, int linenumber)
{
storeblock * bb;
-storeblock * b = current_block[store_pool];
+pooldesc * pp = paired_pools + pool;
+storeblock * b = pp->current_block;
char * bc = CS b + ALIGNED_SIZEOF_STOREBLOCK;
-int newlength;
+int newlength, count;
+#ifndef COMPILE_UTILITY
+int oldmalloc = pool_malloc;
+#endif
+
+if (!b) return; /* exim_dumpdb gets this, becuse it has never used tainted mem */
/* Last store operation was not a get */
-store_last_get[store_pool] = NULL;
+pp->store_last_get = NULL;
/* See if the place is in the current block - as it often will be. Otherwise,
search for the block in which it lies. */
if (CS ptr < bc || CS ptr > bc + b->length)
{
- for (b = chainbase[store_pool]; b; b = b->next)
+ for (b = pp->chainbase; b; b = b->next)
{
bc = CS b + ALIGNED_SIZEOF_STOREBLOCK;
if (CS ptr >= bc && CS ptr <= bc + b->length) break;
}
if (!b)
log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal error: store_reset(%p) "
- "failed: pool=%d %-14s %4d", ptr, store_pool, filename, linenumber);
+ "failed: pool=%d %-14s %4d", ptr, pool, func, linenumber);
}
/* Back up, rounding to the alignment if necessary. When testing, flatten
#ifndef COMPILE_UTILITY
if (debug_store)
{
- assert_no_variables(ptr, newlength, filename, linenumber);
+ assert_no_variables(ptr, newlength, func, linenumber);
if (f.running_in_test_harness)
{
(void) VALGRIND_MAKE_MEM_DEFINED(ptr, newlength);
}
#endif
(void) VALGRIND_MAKE_MEM_NOACCESS(ptr, newlength);
-yield_length[store_pool] = newlength - (newlength % alignment);
-next_yield[store_pool] = CS ptr + (newlength % alignment);
-current_block[store_pool] = b;
-
-/* Free any subsequent block. Do NOT free the first successor, if our
-current block has less than 256 bytes left. This should prevent us from
-flapping memory. However, keep this block only when it has the default size. */
-
-if (yield_length[store_pool] < STOREPOOL_MIN_SIZE &&
- b->next &&
- b->next->length == STORE_BLOCK_SIZE)
+pp->next_yield = CS ptr + (newlength % alignment);
+count = pp->yield_length;
+count = (pp->yield_length = newlength - (newlength % alignment)) - count;
+pp->current_block = b;
+
+/* Free any subsequent block. Do NOT free the first
+successor, if our current block has less than 256 bytes left. This should
+prevent us from flapping memory. However, keep this block only when it has
+a power-of-two size so probably is not a custom inflated one. */
+
+if ( pp->yield_length < STOREPOOL_MIN_SIZE
+ && b->next
+ && is_pwr2_size(b->next->length + ALIGNED_SIZEOF_STOREBLOCK))
{
b = b->next;
#ifndef COMPILE_UTILITY
if (debug_store)
assert_no_variables(b, b->length + ALIGNED_SIZEOF_STOREBLOCK,
- filename, linenumber);
+ func, linenumber);
#endif
(void) VALGRIND_MAKE_MEM_NOACCESS(CS b + ALIGNED_SIZEOF_STOREBLOCK,
b->length - ALIGNED_SIZEOF_STOREBLOCK);
}
bb = b->next;
-b->next = NULL;
+if (pool != POOL_CONFIG)
+ b->next = NULL;
while ((b = bb))
{
+ int siz = b->length + ALIGNED_SIZEOF_STOREBLOCK;
+
#ifndef COMPILE_UTILITY
if (debug_store)
assert_no_variables(b, b->length + ALIGNED_SIZEOF_STOREBLOCK,
- filename, linenumber);
+ func, linenumber);
#endif
bb = bb->next;
- pool_malloc -= b->length + ALIGNED_SIZEOF_STOREBLOCK;
- store_free_3(b, filename, linenumber);
+ pp->nbytes -= siz;
+ pool_malloc -= siz;
+ pp->nblocks--;
+ if (pool != POOL_CONFIG)
+ internal_store_free(b, func, linenumber);
+
+#ifndef RESTRICTED_MEMORY
+ if (pp->store_block_order > 13) pp->store_block_order--;
+#endif
}
/* Cut out the debugging stuff for utilities, but stop picky compilers from
giving warnings. */
-#ifdef COMPILE_UTILITY
-filename = filename;
-linenumber = linenumber;
-#else
+#ifndef COMPILE_UTILITY
DEBUG(D_memory)
+ debug_printf("---%d Rst %6p %5d %-14s %4d\tpool %d\n", pool, ptr,
+ count + oldmalloc - pool_malloc,
+ func, linenumber, pool_malloc);
+#endif /* COMPILE_UTILITY */
+}
+
+
+/* Back up the pool pair, untainted and tainted, of the store_pool setting.
+Quoted pools are not handled.
+*/
+
+rmark
+store_reset_3(rmark r, const char * func, int linenumber)
+{
+void ** ptr = r;
+
+if (store_pool >= POOL_TAINT_BASE)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "store_reset called for pool %d: %s %d\n", store_pool, func, linenumber);
+if (!r)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "store_reset called with bad mark: %s %d\n", func, linenumber);
+
+internal_store_reset(*ptr, store_pool + POOL_TAINT_BASE, func, linenumber);
+internal_store_reset(ptr, store_pool, func, linenumber);
+return NULL;
+}
+
+
+/**************/
+
+/* Free tail-end unused allocation. This lets us allocate a big chunk
+early, for cases when we only discover later how much was really needed.
+
+Can be called with a value from store_get(), or an offset after such. Only
+the tainted or untainted pool that serviced the store_get() will be affected.
+
+This is mostly a cut-down version of internal_store_reset().
+XXX needs rationalising
+*/
+
+void
+store_release_above_3(void * ptr, const char * func, int linenumber)
+{
+pooldesc * pp;
+
+/* Search all pools' "current" blocks. If it isn't one of those,
+ignore it (it usually will be). */
+
+if ((pp = pool_current_for_pointer(ptr)))
{
- if (f.running_in_test_harness)
- debug_printf("---%d Rst ** %d\n", store_pool, pool_malloc);
- else
- debug_printf("---%d Rst %6p ** %-14s %4d %d\n", store_pool, ptr,
- filename, linenumber, pool_malloc);
+ storeblock * b = pp->current_block;
+ int count, newlength;
+
+ /* Last store operation was not a get */
+
+ pp->store_last_get = NULL;
+
+ /* Back up, rounding to the alignment if necessary. When testing, flatten
+ the released memory. */
+
+ newlength = (CS b + ALIGNED_SIZEOF_STOREBLOCK) + b->length - CS ptr;
+#ifndef COMPILE_UTILITY
+ if (debug_store)
+ {
+ assert_no_variables(ptr, newlength, func, linenumber);
+ if (f.running_in_test_harness)
+ {
+ (void) VALGRIND_MAKE_MEM_DEFINED(ptr, newlength);
+ memset(ptr, 0xF0, newlength);
+ }
+ }
+#endif
+ (void) VALGRIND_MAKE_MEM_NOACCESS(ptr, newlength);
+ pp->next_yield = CS ptr + (newlength % alignment);
+ count = pp->yield_length;
+ count = (pp->yield_length = newlength - (newlength % alignment)) - count;
+
+ /* Cut out the debugging stuff for utilities, but stop picky compilers from
+ giving warnings. */
+
+#ifndef COMPILE_UTILITY
+ DEBUG(D_memory)
+ {
+ quoted_pooldesc * qp;
+ for (qp = quoted_pools; qp; qp = qp->next)
+ if (pp == &qp->pool)
+ debug_printf("---Q%d Rel %6p %5d %-14s %4d\tpool %d\n",
+ (int)(qp - quoted_pools),
+ ptr, count, func, linenumber, pool_malloc);
+ if (!qp)
+ debug_printf("---%d Rel %6p %5d %-14s %4d\tpool %d\n",
+ (int)(pp - paired_pools), ptr, count,
+ func, linenumber, pool_malloc);
+ }
+#endif
+ return;
}
-#endif /* COMPILE_UTILITY */
+#ifndef COMPILE_UTILITY
+DEBUG(D_memory)
+ debug_printf("non-last memory release try: %s %d\n", func, linenumber);
+#endif
}
+rmark
+store_mark_3(const char * func, int linenumber)
+{
+void ** p;
+
+#ifndef COMPILE_UTILITY
+DEBUG(D_memory)
+ debug_printf("---%d Mrk %-14s %4d\tpool %d\n",
+ store_pool, func, linenumber, pool_malloc);
+#endif /* COMPILE_UTILITY */
+
+if (store_pool >= POOL_TAINT_BASE)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "store_mark called for pool %d: %s %d\n", store_pool, func, linenumber);
+
+/* Stash a mark for the tainted-twin release, in the untainted twin. Return
+a cookie (actually the address in the untainted pool) to the caller.
+Reset uses the cookie to recover the t-mark, winds back the tainted pool with it
+and winds back the untainted pool with the cookie. */
+
+p = store_get_3(sizeof(void *), GET_UNTAINTED, func, linenumber);
+*p = store_get_3(0, GET_TAINTED, func, linenumber);
+return p;
+}
+
+
/************************************************
Arguments:
block block of store to consider
- filename source file from which called
+ pp pool containing the block
+ func function from which called
linenumber line number in source file
Returns: nothing
*/
static void
-store_release_3(void * block, const char * filename, int linenumber)
+store_release_3(void * block, pooldesc * pp, const char * func, int linenumber)
{
/* It will never be the first block, so no need to check that. */
-for (storeblock * b = chainbase[store_pool]; b; b = b->next)
+for (storeblock * b = pp->chainbase; b; b = b->next)
{
storeblock * bb = b->next;
if (bb && CS block == CS bb + ALIGNED_SIZEOF_STOREBLOCK)
{
+ int siz = bb->length + ALIGNED_SIZEOF_STOREBLOCK;
b->next = bb->next;
- pool_malloc -= bb->length + ALIGNED_SIZEOF_STOREBLOCK;
+ pp->nbytes -= siz;
+ pool_malloc -= siz;
+ pp->nblocks--;
/* Cut out the debugging stuff for utilities, but stop picky compilers
from giving warnings. */
-#ifdef COMPILE_UTILITY
- filename = filename;
- linenumber = linenumber;
-#else
+#ifndef COMPILE_UTILITY
DEBUG(D_memory)
- if (f.running_in_test_harness)
- debug_printf("-Release %d\n", pool_malloc);
- else
- debug_printf("-Release %6p %-20s %4d %d\n", (void *)bb, filename,
- linenumber, pool_malloc);
+ debug_printf("-Release %6p %-20s %4d %d\n", (void *)bb, func,
+ linenumber, pool_malloc);
if (f.running_in_test_harness)
memset(bb, 0xF0, bb->length+ALIGNED_SIZEOF_STOREBLOCK);
#endif /* COMPILE_UTILITY */
- free(bb);
+ internal_store_free(bb, func, linenumber);
return;
}
}
has been allocated since. If so, releases that block.
Arguments:
- block
- newsize
- len
+ oldblock
+ newsize requested size
+ len current size
Returns: new location of data
*/
void *
-store_newblock_3(void * block, int newsize, int len,
- const char * filename, int linenumber)
+store_newblock_3(void * oldblock, int newsize, int len,
+ const char * func, int linenumber)
{
-BOOL release_ok = store_last_get[store_pool] == block;
-uschar * newtext = store_get(newsize);
-
-memcpy(newtext, block, len);
-if (release_ok) store_release_3(block, filename, linenumber);
-return (void *)newtext;
+pooldesc * pp = pool_for_pointer(oldblock, func, linenumber);
+BOOL release_ok = !is_tainted(oldblock) && pp->store_last_get == oldblock; /*XXX why tainted not handled? */
+uschar * newblock;
+
+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);
+
+newblock = store_get(newsize, oldblock);
+memcpy(newblock, oldblock, len);
+if (release_ok) store_release_3(oldblock, pp, func, linenumber);
+return (void *)newblock;
}
Arguments:
size amount of store wanted
- filename source file from which called
- linenumber line number in source file
+ func function from which called
+ line line number in source file
Returns: pointer to gotten store (panic on failure)
*/
-void *
-store_malloc_3(int size, const char *filename, int linenumber)
+static void *
+internal_store_malloc(size_t size, const char *func, int line)
{
-void *yield;
+void * yield;
+
+/* Check specifically for a possibly result of conversion from
+a negative int, to the (unsigned, wider) size_t */
+
+if (size >= INT_MAX/2)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "bad internal_store_malloc request (" SIZE_T_FMT " bytes) from %s %d",
+ size, func, line);
+size += sizeof(size_t); /* space to store the size, used under debug */
if (size < 16) size = 16;
-if (!(yield = malloc((size_t)size)))
- log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to malloc %d bytes of memory: "
- "called from line %d of %s", size, linenumber, filename);
+if (!(yield = malloc(size)))
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to malloc " SIZE_T_FMT " bytes of memory: "
+ "called from line %d in %s", size, line, func);
-nonpool_malloc += size;
+#ifndef COMPILE_UTILITY
+DEBUG(D_any) *(size_t *)yield = size;
+#endif
+yield = US yield + sizeof(size_t);
+
+if ((nonpool_malloc += size) > max_nonpool_malloc)
+ max_nonpool_malloc = nonpool_malloc;
/* Cut out the debugging stuff for utilities, but stop picky compilers from
giving warnings. */
-#ifdef COMPILE_UTILITY
-filename = filename;
-linenumber = linenumber;
-#else
-
+#ifndef COMPILE_UTILITY
/* If running in test harness, spend time making sure all the new store
is not filled with zeros so as to catch problems. */
if (f.running_in_test_harness)
- {
- memset(yield, 0xF0, (size_t)size);
- DEBUG(D_memory) debug_printf("--Malloc %5d %d %d\n", size, pool_malloc,
- nonpool_malloc);
- }
-else
- {
- DEBUG(D_memory) debug_printf("--Malloc %6p %5d %-14s %4d %d %d\n", yield,
- size, filename, linenumber, pool_malloc, nonpool_malloc);
- }
+ memset(yield, 0xF0, size - sizeof(size_t));
+DEBUG(D_memory) debug_printf("--Malloc %6p %5lu bytes\t%-20s %4d\tpool %5d nonpool %5d\n",
+ yield, size, func, line, pool_malloc, nonpool_malloc);
#endif /* COMPILE_UTILITY */
return yield;
}
+void *
+store_malloc_3(size_t size, const char *func, int linenumber)
+{
+if (n_nonpool_blocks++ > max_nonpool_blocks)
+ max_nonpool_blocks = n_nonpool_blocks;
+return internal_store_malloc(size, func, linenumber);
+}
+
/************************************************
* Free store *
Arguments:
block block of store to free
- filename source file from which called
+ func function from which called
linenumber line number in source file
Returns: nothing
*/
+static void
+internal_store_free(void * block, const char * func, int linenumber)
+{
+uschar * p = US block - sizeof(size_t);
+#ifndef COMPILE_UTILITY
+DEBUG(D_any) nonpool_malloc -= *(size_t *)p;
+DEBUG(D_memory) debug_printf("----Free %6p %5ld bytes\t%-20s %4d\n",
+ block, *(size_t *)p, func, linenumber);
+#endif
+free(p);
+}
+
void
-store_free_3(void *block, const char *filename, int linenumber)
+store_free_3(void * block, const char * func, int linenumber)
{
-#ifdef COMPILE_UTILITY
-filename = filename;
-linenumber = linenumber;
-#else
+n_nonpool_blocks--;
+internal_store_free(block, func, linenumber);
+}
+
+/******************************************************************************/
+/* Stats output on process exit */
+void
+store_exit(void)
+{
+#ifndef COMPILE_UTILITY
DEBUG(D_memory)
- {
- if (f.running_in_test_harness)
- debug_printf("----Free\n");
- else
- debug_printf("----Free %6p %-20s %4d\n", block, filename, linenumber);
- }
-#endif /* COMPILE_UTILITY */
-free(block);
+ {
+ int i;
+ debug_printf("----Exit nonpool max: %3d kB in %d blocks\n",
+ (max_nonpool_malloc+1023)/1024, max_nonpool_blocks);
+ debug_printf("----Exit npools max: %3d kB\n", max_pool_malloc/1024);
+
+ for (i = 0; i < N_PAIRED_POOLS; i++)
+ {
+ pooldesc * pp = paired_pools + i;
+ debug_printf("----Exit pool %2d max: %3d kB in %d blocks at order %u\t%s %s\n",
+ i, (pp->maxbytes+1023)/1024, pp->maxblocks, pp->maxorder,
+ poolclass[i], pooluse[i]);
+ }
+ i = 0;
+ for (quoted_pooldesc * qp = quoted_pools; qp; i++, qp = qp->next)
+ {
+ pooldesc * pp = &qp->pool;
+ debug_printf("----Exit pool Q%d max: %3d kB in %d blocks at order %u\ttainted quoted:%s\n",
+ i, (pp->maxbytes+1023)/1024, pp->maxblocks, pp->maxorder, lookup_list[qp->quoter]->name);
+ }
+ }
+#endif
}
+
+/******************************************************************************/
+/* Per-message pool management */
+
+static rmark message_reset_point = NULL;
+
+void
+message_start(void)
+{
+int oldpool = store_pool;
+store_pool = POOL_MESSAGE;
+if (!message_reset_point) message_reset_point = store_mark();
+store_pool = oldpool;
+}
+
+void
+message_tidyup(void)
+{
+int oldpool;
+if (!message_reset_point) return;
+oldpool = store_pool;
+store_pool = POOL_MESSAGE;
+message_reset_point = store_reset(message_reset_point);
+store_pool = oldpool;
+}
+
+/******************************************************************************/
+/* Debug analysis of address */
+
+#ifndef COMPILE_UTILITY
+void
+debug_print_taint(const void * p)
+{
+int q = quoter_for_address(p);
+if (!is_tainted(p)) return;
+debug_printf("(tainted");
+if (is_real_quoter(q)) debug_printf(", quoted:%s", lookup_list[q]->name);
+debug_printf(")\n");
+}
+#endif
+
/* End of store.c */
git://git.exim.org / exim.git / blobdiff