* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2016 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim maintainers 2019 */
/* See the file NOTICE for conditions of use and distribution. */
/* Exim gets and frees all its store through these functions. In the original
. 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.
+
+. 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,
+ it can expand an untainted value to return a tainted result). The classes
+ are implemented by duplicating the three 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.
+
+ Internally we currently use malloc for nontainted pools, and mmap for tainted
+ pools. The disparity is for speed of testing the taintedness of pointers;
+ because Linux appears to use distinct non-overlapping address allocations for
+ mmap vs. everything else, which means only two pointer-compares suffice for the
+ test. Other OS' cannot use that optimisation, and a more lengthy test against
+ the limits of tainted-pool allcations has to be done.
+
+ 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. */
#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 8192 is going to be
+suitably aligned. */
+
+#define STORE_BLOCK_SIZE (8192 - 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;
+
+#define NPOOLS 6
+static storeblock *chainbase[NPOOLS];
+static storeblock *current_block[NPOOLS];
+static void *next_yield[NPOOLS];
+static int yield_length[NPOOLS] = { -1, -1, -1, -1, -1, -1 };
-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 };
+/* The limits of the tainted pools. Tracking these on new allocations enables
+a fast is_tainted implementation. We assume the kernel only allocates mmaps using
+one side or the other of data+heap, not both. */
+
+void * tainted_base = (void *)-1;
+void * tainted_top = (void *)0;
/* 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 };
+void *store_last_get[NPOOLS];
+
+/* These are purely for stats-gathering */
+
+static int nbytes[NPOOLS]; /* current bytes allocated */
+static int maxbytes[NPOOLS]; /* max number reached */
+static int nblocks[NPOOLS]; /* current number of blocks allocated */
+static int maxblocks[NPOOLS];
+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 */
+
+
+#ifndef COMPILE_UTILITY
+static const uschar * pooluse[NPOOLS] = {
+[POOL_MAIN] = US"main",
+[POOL_PERM] = US"perm",
+[POOL_SEARCH] = US"search",
+[POOL_TAINT_MAIN] = US"main",
+[POOL_TAINT_PERM] = US"perm",
+[POOL_TAINT_SEARCH] = US"search",
+};
+static const uschar * poolclass[NPOOLS] = {
+[POOL_MAIN] = US"untainted",
+[POOL_PERM] = US"untainted",
+[POOL_SEARCH] = US"untainted",
+[POOL_TAINT_MAIN] = US"tainted",
+[POOL_TAINT_PERM] = US"tainted",
+[POOL_TAINT_SEARCH] = US"tainted",
+};
+#endif
+
+
+static void * store_mmap(int, const char *, int);
+static void * internal_store_malloc(int, const char *, int);
+static void internal_untainted_free(void *, const char *, int linenumber);
+static void internal_tainted_free(storeblock *, const char *, int linenumber);
+
+/******************************************************************************/
+
+/* 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
+*/
+
+BOOL
+is_tainted_fn(const void * p)
+{
+storeblock * b;
+
+for (int pool = POOL_TAINT_BASE; pool < nelem(chainbase); pool++)
+ if ((b = current_block[pool]))
+ {
+ uschar * bc = US b + ALIGNED_SIZEOF_STOREBLOCK;
+ if (US p >= bc && US p <= bc + b->length) return TRUE;
+ }
+
+for (int pool = POOL_TAINT_BASE; pool < nelem(chainbase); pool++)
+ for (b = chainbase[pool]; b; b = b->next)
+ {
+ uschar * bc = US b + ALIGNED_SIZEOF_STOREBLOCK;
+ if (US p >= bc && US p <= bc + b->length) 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);
+}
+
+static void
+use_slow_taint_check(void)
+{
+#ifndef COMPILE_UTILITY
+DEBUG(D_any) debug_printf("switching to slow-mode taint checking\n");
+#endif
+f.taint_check_slow = TRUE;
+}
+
+static void
+verify_all_untainted(void)
+{
+for (int pool = 0; pool < POOL_TAINT_BASE; pool++)
+ for (storeblock * b = chainbase[pool]; b; b = b->next)
+ {
+ uschar * bc = US b + ALIGNED_SIZEOF_STOREBLOCK;
+ if (is_tainted(bc))
+ {
+ use_slow_taint_check();
+ return;
+ }
+ }
+}
store_last_was_get.
Arguments:
- size amount wanted
- filename source file from which called
- linenumber line number in source file.
+ size amount wanted, bytes
+ tainted class: set to true for untrusted data (eg. from smtp input)
+ 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 char *filename, int linenumber)
+store_get_3(int size, BOOL tainted, const char *func, int linenumber)
{
+int pool = tainted ? store_pool + POOL_TAINT_BASE : store_pool;
+
/* 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 > yield_length[pool])
{
- int length = (size <= STORE_BLOCK_SIZE)? STORE_BLOCK_SIZE : size;
+ int length = size <= STORE_BLOCK_SIZE ? STORE_BLOCK_SIZE : 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 (current_block[store_pool] != NULL &&
- current_block[store_pool]->next != NULL)
+ if ( (newblock = current_block[pool])
+ && (newblock = newblock->next)
+ && newblock->length < length
+ )
{
- newblock = current_block[store_pool]->next;
- if (newblock->length < length)
- {
- /* Give up on this block, because it's too small */
- store_free(newblock);
- newblock = NULL;
- }
+ /* Give up on this block, because it's too small */
+ nblocks[pool]--;
+ if (pool < POOL_TAINT_BASE)
+ internal_untainted_free(newblock, func, linenumber);
+ else
+ internal_tainted_free(newblock, func, linenumber);
+ newblock = NULL;
}
/* If there was no free block, get a new one */
- if (newblock == NULL)
+ if (!newblock)
{
- pool_malloc += mlength; /* Used in pools */
- nonpool_malloc -= mlength; /* Exclude from overall total */
- newblock = store_malloc(mlength);
+ if ((nbytes[pool] += mlength) > maxbytes[pool])
+ maxbytes[pool] = nbytes[pool];
+ if ((pool_malloc += mlength) > max_pool_malloc) /* Used in pools */
+ max_pool_malloc = pool_malloc;
+ nonpool_malloc -= mlength; /* Exclude from overall total */
+ if (++nblocks[pool] > maxblocks[pool])
+ maxblocks[pool] = nblocks[pool];
+
+ newblock = tainted
+ ? store_mmap(mlength, func, linenumber)
+ : internal_store_malloc(mlength, func, linenumber);
newblock->next = NULL;
newblock->length = length;
- if (chainbase[store_pool] == NULL) chainbase[store_pool] = newblock;
- else current_block[store_pool]->next = newblock;
+
+ if (!chainbase[pool])
+ chainbase[pool] = newblock;
+ else
+ current_block[pool]->next = newblock;
}
- current_block[store_pool] = newblock;
- yield_length[store_pool] = newblock->length;
- next_yield[store_pool] =
- (void *)((char *)current_block[store_pool] + ALIGNED_SIZEOF_STOREBLOCK);
- (void) VALGRIND_MAKE_MEM_NOACCESS(next_yield[store_pool], yield_length[store_pool]);
+ current_block[pool] = newblock;
+ yield_length[pool] = newblock->length;
+ next_yield[pool] =
+ (void *)(CS current_block[pool] + ALIGNED_SIZEOF_STOREBLOCK);
+ (void) VALGRIND_MAKE_MEM_NOACCESS(next_yield[pool], yield_length[pool]);
}
/* There's (now) enough room in the current block; the yield is the next
pointer. */
-store_last_get[store_pool] = next_yield[store_pool];
+store_last_get[pool] = next_yield[pool];
/* Cut out the debugging stuff for utilities, but stop picky compilers from
giving warnings. */
#ifdef COMPILE_UTILITY
-filename = filename;
+func = func;
linenumber = linenumber;
#else
DEBUG(D_memory)
- {
- if (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);
- }
+ debug_printf("---%d Get %6p %5d %-14s %4d\n", pool,
+ store_last_get[pool], size, func, linenumber);
#endif /* COMPILE_UTILITY */
-(void) VALGRIND_MAKE_MEM_UNDEFINED(store_last_get[store_pool], size);
+(void) VALGRIND_MAKE_MEM_UNDEFINED(store_last_get[pool], size);
/* Update next pointer and number of bytes left in the current block. */
-next_yield[store_pool] = (void *)((char *)next_yield[store_pool] + size);
-yield_length[store_pool] -= size;
-
-return store_last_get[store_pool];
+next_yield[pool] = (void *)(CS next_yield[pool] + size);
+yield_length[pool] -= size;
+return store_last_get[pool];
}
Arguments:
size amount wanted
- filename source file from which called
- linenumber line number in source file.
+ 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, BOOL tainted, const char *func, int linenumber)
{
void *yield;
int old_pool = store_pool;
store_pool = POOL_PERM;
-yield = store_get_3(size, filename, linenumber);
+yield = store_get_3(size, tainted, func, linenumber);
store_pool = old_pool;
return yield;
}
/* 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
*/
BOOL
-store_extend_3(void *ptr, int oldsize, int newsize, const char *filename,
- int linenumber)
+store_extend_3(void *ptr, BOOL tainted, int oldsize, int newsize,
+ const char *func, int linenumber)
{
+int pool = tainted ? store_pool + POOL_TAINT_BASE : store_pool;
int inc = newsize - oldsize;
int rounded_oldsize = oldsize;
+/* Check that the block being extended was already of the required taint status;
+refuse to extend if not. */
+
+if (is_tainted(ptr) != tainted)
+ return FALSE;
+
if (rounded_oldsize % alignment != 0)
rounded_oldsize += alignment - (rounded_oldsize % alignment);
-if ((char *)ptr + rounded_oldsize != (char *)(next_yield[store_pool]) ||
- inc > yield_length[store_pool] + rounded_oldsize - oldsize)
+if (CS ptr + rounded_oldsize != CS (next_yield[pool]) ||
+ inc > yield_length[pool] + rounded_oldsize - oldsize)
return FALSE;
/* Cut out the debugging stuff for utilities, but stop picky compilers from
giving warnings. */
#ifdef COMPILE_UTILITY
-filename = filename;
+func = func;
linenumber = linenumber;
#else
DEBUG(D_memory)
- {
- if (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);
- }
+ debug_printf("---%d Ext %6p %5d %-14s %4d\n", pool, ptr, newsize,
+ func, linenumber);
#endif /* COMPILE_UTILITY */
if (newsize % alignment != 0) newsize += alignment - (newsize % alignment);
-next_yield[store_pool] = (char *)ptr + newsize;
-yield_length[store_pool] -= newsize - rounded_oldsize;
+next_yield[pool] = CS ptr + newsize;
+yield_length[pool] -= newsize - rounded_oldsize;
(void) VALGRIND_MAKE_MEM_UNDEFINED(ptr + oldsize, inc);
return TRUE;
}
*************************************************/
/* 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.
Arguments:
- ptr place to back up to
- filename source file from which called
+ r place to back up to
+ 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];
-char *bc = (char *)b + ALIGNED_SIZEOF_STOREBLOCK;
-int newlength;
+storeblock * bb;
+storeblock * b = current_block[pool];
+char * bc = CS b + ALIGNED_SIZEOF_STOREBLOCK;
+int newlength, count;
+#ifndef COMPILE_UTILITY
+int oldmalloc = pool_malloc;
+#endif
/* Last store operation was not a get */
-store_last_get[store_pool] = NULL;
+store_last_get[pool] = 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 ((char *)ptr < bc || (char *)ptr > bc + b->length)
+if (CS ptr < bc || CS ptr > bc + b->length)
{
- for (b = chainbase[store_pool]; b != NULL; b = b->next)
+ for (b = chainbase[pool]; b; b = b->next)
{
- bc = (char *)b + ALIGNED_SIZEOF_STOREBLOCK;
- if ((char *)ptr >= bc && (char *)ptr <= bc + b->length) break;
+ bc = CS b + ALIGNED_SIZEOF_STOREBLOCK;
+ if (CS ptr >= bc && CS ptr <= bc + b->length) break;
}
- if (b == NULL)
+ 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
the released memory. */
-newlength = bc + b->length - (char *)ptr;
+newlength = bc + b->length - CS ptr;
#ifndef COMPILE_UTILITY
-if (running_in_test_harness)
+if (debug_store)
{
- (void) VALGRIND_MAKE_MEM_DEFINED(ptr, newlength);
- memset(ptr, 0xF0, newlength);
+ 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);
-yield_length[store_pool] = newlength - (newlength % alignment);
-next_yield[store_pool] = (char *)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 != NULL &&
- b->next->length == STORE_BLOCK_SIZE)
+next_yield[pool] = CS ptr + (newlength % alignment);
+count = yield_length[pool];
+count = (yield_length[pool] = newlength - (newlength % alignment)) - count;
+current_block[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[pool] < STOREPOOL_MIN_SIZE
+ && b->next
+ && b->next->length == STORE_BLOCK_SIZE)
{
b = b->next;
- (void) VALGRIND_MAKE_MEM_NOACCESS((char *)b + ALIGNED_SIZEOF_STOREBLOCK,
+#ifndef COMPILE_UTILITY
+ if (debug_store)
+ assert_no_variables(b, b->length + ALIGNED_SIZEOF_STOREBLOCK,
+ func, linenumber);
+#endif
+ (void) VALGRIND_MAKE_MEM_NOACCESS(CS b + ALIGNED_SIZEOF_STOREBLOCK,
b->length - ALIGNED_SIZEOF_STOREBLOCK);
}
bb = b->next;
b->next = NULL;
-while (bb != NULL)
+while ((b = bb))
{
- b = bb;
+ int siz = b->length + ALIGNED_SIZEOF_STOREBLOCK;
+#ifndef COMPILE_UTILITY
+ if (debug_store)
+ assert_no_variables(b, b->length + ALIGNED_SIZEOF_STOREBLOCK,
+ func, linenumber);
+#endif
bb = bb->next;
- pool_malloc -= b->length + ALIGNED_SIZEOF_STOREBLOCK;
- store_free_3(b, filename, linenumber);
+ nbytes[pool] -= siz;
+ pool_malloc -= siz;
+ nblocks[pool]--;
+ if (pool < POOL_TAINT_BASE)
+ internal_untainted_free(b, func, linenumber);
+ else
+ internal_tainted_free(b, func, linenumber);
}
/* Cut out the debugging stuff for utilities, but stop picky compilers from
giving warnings. */
#ifdef COMPILE_UTILITY
-filename = filename;
+func = func;
linenumber = linenumber;
#else
DEBUG(D_memory)
+ debug_printf("---%d Rst %6p %5d %-14s %4d %d\n", pool, ptr,
+ count + oldmalloc - pool_malloc,
+ func, linenumber, pool_malloc);
+#endif /* COMPILE_UTILITY */
+}
+
+
+rmark
+store_reset_3(rmark r, int pool, const char *func, int linenumber)
+{
+void ** ptr = r;
+
+if (pool >= POOL_TAINT_BASE)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "store_reset called for pool %d: %s %d\n", 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, pool + POOL_TAINT_BASE, func, linenumber);
+internal_store_reset(ptr, 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)
+{
+/* Search all pools' "current" blocks. If it isn't one of those,
+ignore it (it usually will be). */
+
+for (int pool = 0; pool < nelem(current_block); pool++)
{
- if (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 = current_block[pool];
+ char * bc;
+ int count, newlength;
+
+ if (!b)
+ continue;
+
+ bc = CS b + ALIGNED_SIZEOF_STOREBLOCK;
+ if (CS ptr < bc || CS ptr > bc + b->length)
+ continue;
+
+ /* Last store operation was not a get */
+
+ store_last_get[pool] = NULL;
+
+ /* Back up, rounding to the alignment if necessary. When testing, flatten
+ the released memory. */
+
+ newlength = bc + 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);
+ next_yield[pool] = CS ptr + (newlength % alignment);
+ count = yield_length[pool];
+ count = (yield_length[pool] = newlength - (newlength % alignment)) - count;
+
+ /* Cut out the debugging stuff for utilities, but stop picky compilers from
+ giving warnings. */
+
+#ifdef COMPILE_UTILITY
+ func = func;
+ linenumber = linenumber;
+#else
+ DEBUG(D_memory)
+ debug_printf("---%d Rel %6p %5d %-14s %4d %d\n", pool, 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;
+
+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 *), FALSE, func, linenumber);
+*p = store_get_3(0, TRUE, func, linenumber);
+return p;
+}
+
+
/************************************************
* Release store *
************************************************/
-/* This function is specifically provided for use when reading very
-long strings, e.g. header lines. When the string gets longer than a
-complete block, it gets copied to a new block. It is helpful to free
-the old block iff the previous copy of the string is at its start,
-and therefore the only thing in it. Otherwise, for very long strings,
-dead store can pile up somewhat disastrously. This function checks that
-the pointer it is given is the first thing in a block, and if so,
-releases that block.
+/* This function checks that the pointer it is given is the first thing in a
+block, and if so, releases that block.
Arguments:
block block of store to consider
- filename source file from which called
+ func function from which called
linenumber line number in source file
Returns: nothing
*/
-void
-store_release_3(void *block, const char *filename, int linenumber)
+static void
+store_release_3(void * block, int pool, const char * func, int linenumber)
{
-storeblock *b;
-
/* It will never be the first block, so no need to check that. */
-for (b = chainbase[store_pool]; b != NULL; b = b->next)
+for (storeblock * b = chainbase[pool]; b; b = b->next)
{
- storeblock *bb = b->next;
- if (bb != NULL && (char *)block == (char *)bb + ALIGNED_SIZEOF_STOREBLOCK)
+ 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;
+ nbytes[pool] -= siz;
+ pool_malloc -= siz;
+ nblocks[pool]--;
/* Cut out the debugging stuff for utilities, but stop picky compilers
from giving warnings. */
- #ifdef COMPILE_UTILITY
- filename = filename;
+#ifdef COMPILE_UTILITY
+ func = func;
linenumber = linenumber;
- #else
+#else
DEBUG(D_memory)
- {
- if (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);
- }
- if (running_in_test_harness)
+ 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 */
+#endif /* COMPILE_UTILITY */
free(bb);
return;
}
+/************************************************
+* Move store *
+************************************************/
+/* Allocate a new block big enough to expend to the given size and
+copy the current data into it. Free the old one if possible.
+
+This function is specifically provided for use when reading very
+long strings, e.g. header lines. When the string gets longer than a
+complete block, it gets copied to a new block. It is helpful to free
+the old block iff the previous copy of the string is at its start,
+and therefore the only thing in it. Otherwise, for very long strings,
+dead store can pile up somewhat disastrously. This function checks that
+the pointer it is given is the first thing in a block, and that nothing
+has been allocated since. If so, releases that block.
+
+Arguments:
+ block
+ newsize
+ len
+
+Returns: new location of data
+*/
+
+void *
+store_newblock_3(void * block, BOOL tainted, int newsize, int len,
+ const char * func, int linenumber)
+{
+int pool = tainted ? store_pool + POOL_TAINT_BASE : store_pool;
+BOOL release_ok = !tainted && store_last_get[pool] == block;
+uschar * newtext;
+
+#if !defined(MACRO_PREDEF) && !defined(COMPILE_UTILITY)
+if (is_tainted(block) != tainted)
+ die_tainted(US"store_newblock", CUS func, linenumber);
+#endif
+
+newtext = store_get(newsize, tainted);
+memcpy(newtext, block, len);
+if (release_ok) store_release_3(block, pool, func, linenumber);
+return (void *)newtext;
+}
+
+
+
+
+/******************************************************************************/
+static void *
+store_alloc_tail(void * yield, int size, const char * func, int line,
+ const uschar * type)
+{
+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
+func = func; line = line; type = type;
+#else
+
+/* 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("--%6s %6p %5d bytes\t%-14s %4d\tpool %5d nonpool %5d\n",
+ type, yield, size, func, line, pool_malloc, nonpool_malloc);
+#endif /* COMPILE_UTILITY */
+
+return yield;
+}
+
+/*************************************************
+* Mmap store *
+*************************************************/
+
+static void *
+store_mmap(int size, const char * func, int line)
+{
+void * yield, * top;
+
+if (size < 16) size = 16;
+
+if (!(yield = mmap(NULL, (size_t)size,
+ PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)))
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to mmap %d bytes of memory: "
+ "called from line %d of %s", size, line, func);
+
+if (yield < tainted_base) tainted_base = yield;
+if ((top = US yield + size) > tainted_top) tainted_top = top;
+if (!f.taint_check_slow) use_slow_taint_check();
+
+return store_alloc_tail(yield, size, func, line, US"Mmap");
+}
/*************************************************
* Malloc store *
Arguments:
size amount of store wanted
- filename source file from which called
+ func function from which called
linenumber 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(int size, const char *func, int linenumber)
{
-void *yield;
+void * yield;
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);
-
-nonpool_malloc += size;
+ "called from line %d in %s", size, linenumber, func);
-/* Cut out the debugging stuff for utilities, but stop picky compilers from
-giving warnings. */
-
-#ifdef COMPILE_UTILITY
-filename = filename;
-linenumber = linenumber;
-#else
+/* If malloc ever returns apparently tainted memory, which glibc
+malloc will as it uses mmap for larger requests, we must switch to
+the slower checking for tainting (checking an address against all
+the tainted pool block spans, rather than just the mmap span) */
-/* 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.taint_check_slow && is_tainted(yield))
+ use_slow_taint_check();
-if (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);
- }
-#endif /* COMPILE_UTILITY */
+return store_alloc_tail(yield, size, func, linenumber, US"Malloc");
+}
-return yield;
+void *
+store_malloc_3(int 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);
}
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
*/
-void
-store_free_3(void *block, const char *filename, int linenumber)
+static void
+internal_untainted_free(void * block, const char * func, int linenumber)
{
#ifdef COMPILE_UTILITY
-filename = filename;
+func = func;
linenumber = linenumber;
#else
DEBUG(D_memory)
- {
- if (running_in_test_harness)
- debug_printf("----Free\n");
- else
- debug_printf("----Free %6p %-20s %4d\n", block, filename, linenumber);
- }
+ debug_printf("----Free %6p %-20s %4d\n", block, func, linenumber);
#endif /* COMPILE_UTILITY */
free(block);
}
+void
+store_free_3(void * block, const char * func, int linenumber)
+{
+n_nonpool_blocks--;
+internal_untainted_free(block, func, linenumber);
+}
+
+/******************************************************************************/
+static void
+internal_tainted_free(storeblock * block, const char * func, int linenumber)
+{
+#ifdef COMPILE_UTILITY
+func = func;
+linenumber = linenumber;
+#else
+DEBUG(D_memory)
+ debug_printf("---Unmap %6p %-20s %4d\n", block, func, linenumber);
+#endif
+munmap((void *)block, block->length + ALIGNED_SIZEOF_STOREBLOCK);
+}
+
+/******************************************************************************/
+/* Stats output on process exit */
+void
+store_exit(void)
+{
+#ifndef COMPILE_UTILITY
+DEBUG(D_memory)
+ {
+ 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 (int i = 0; i < NPOOLS; i++)
+ debug_printf("----Exit pool %d max: %3d kB in %d blocks\t%s %s\n",
+ i, maxbytes[i]/1024, maxblocks[i], poolclass[i], pooluse[i]);
+ }
+#endif
+}
+
/* End of store.c */
projects / exim.git / blobdiff