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Overview
| Comment: | Avoid unsigned integer overflows for SQLITE_WIN32_HEAP_INIT_SIZE when the Win32 heap subsystem is used with very large values of SQLITE_DEFAULT_CACHE_SIZE and/or SQLITE_DEFAULT_PAGE_SIZE. |
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| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
96b6a98e5e4cb0ddbfcd78b05bfbfcd8 |
| User & Date: | mistachkin 2017-02-20 19:13:37.359 |
Context
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2017-02-20
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| 23:32 | Correct a harmless typo in the previous check-in. (check-in: 1589db012e user: mistachkin tags: trunk) | |
| 19:13 | Avoid unsigned integer overflows for SQLITE_WIN32_HEAP_INIT_SIZE when the Win32 heap subsystem is used with very large values of SQLITE_DEFAULT_CACHE_SIZE and/or SQLITE_DEFAULT_PAGE_SIZE. (check-in: 96b6a98e5e user: mistachkin tags: trunk) | |
| 14:30 | Small grammar simplification. (check-in: 0d8a868acd user: drh tags: trunk) | |
Changes
Changes to src/os_win.c.
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348 349 350 351 352 353 354 | * winMemShutdown function is called (e.g. by the sqlite3_shutdown * function), all data that was allocated using the isolated heap will * be freed immediately and any attempt to access any of that freed * data will almost certainly result in an immediate access violation. ****************************************************************************** */ #ifndef SQLITE_WIN32_HEAP_CREATE | | > > > > > > > > > > > > > > > > > > > > > > > > > > > | | > > > > > > > > > > | | > | | | 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 |
* winMemShutdown function is called (e.g. by the sqlite3_shutdown
* function), all data that was allocated using the isolated heap will
* be freed immediately and any attempt to access any of that freed
* data will almost certainly result in an immediate access violation.
******************************************************************************
*/
#ifndef SQLITE_WIN32_HEAP_CREATE
# define SQLITE_WIN32_HEAP_CREATE (TRUE)
#endif
/*
* This is the maximum possible initial size of the Win32-specific heap, in
* bytes.
*/
#ifndef SQLITE_WIN32_HEAP_MAX_INIT_SIZE
# define SQLITE_WIN32_HEAP_MAX_INIT_SIZE (4294967295U)
#endif
/*
* This is the extra space for the initial size of the Win32-specific heap,
* in bytes. This value may be zero.
*/
#ifndef SQLITE_WIN32_HEAP_INIT_EXTRA
# define SQLITE_WIN32_HEAP_INIT_EXTRA (4194304)
#endif
/*
* Calculate the maximum legal cache size, in pages, based on the maximum
* possible initial heap size and the default page size, setting aside the
* needed extra space.
*/
#ifndef SQLITE_WIN32_MAX_CACHE_SIZE
# define SQLITE_WIN32_MAX_CACHE_SIZE (((SQLITE_WIN32_HEAP_MAX_INIT_SIZE) - \
(SQLITE_WIN32_HEAP_INIT_EXTRA)) / \
(SQLITE_DEFAULT_PAGE_SIZE))
#endif
/*
* This is cache size used in the calculation of the initial size of the
* Win32-specific heap. It cannot be negative.
*/
#ifndef SQLITE_WIN32_CACHE_SIZE
# if SQLITE_DEFAULT_CACHE_SIZE>=0
# define SQLITE_WIN32_CACHE_SIZE (SQLITE_DEFAULT_CACHE_SIZE)
# else
# define SQLITE_WIN32_CACHE_SIZE (-(SQLITE_DEFAULT_CACHE_SIZE))
# endif
#endif
/*
* Make sure that the calculated cache size, in pages, cannot cause the
* initial size of the Win32-specific heap to exceed the maximum amount
* of memory that can be specified in the call to HeapCreate.
*/
#if SQLITE_WIN32_CACHE_SIZE>=SQLITE_WIN32_MAX_CACHE_SIZE
# undef SQLITE_WIN32_CACHE_SIZE
# define SQLITE_WIN32_CACHE_SIZE (2000)
#endif
/*
* The initial size of the Win32-specific heap. This value may be zero.
*/
#ifndef SQLITE_WIN32_HEAP_INIT_SIZE
# define SQLITE_WIN32_HEAP_INIT_SIZE ((SQLITE_WIN32_CACHE_SIZE) * \
(SQLITE_DEFAULT_PAGE_SIZE) + \
(SQLITE_WIN32_HEAP_INIT_EXTRA))
#endif
/*
* The maximum size of the Win32-specific heap. This value may be zero.
*/
#ifndef SQLITE_WIN32_HEAP_MAX_SIZE
# define SQLITE_WIN32_HEAP_MAX_SIZE (0)
#endif
/*
* The extra flags to use in calls to the Win32 heap APIs. This value may be
* zero for the default behavior.
*/
#ifndef SQLITE_WIN32_HEAP_FLAGS
# define SQLITE_WIN32_HEAP_FLAGS (0)
#endif
/*
** The winMemData structure stores information required by the Win32-specific
** sqlite3_mem_methods implementation.
*/
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