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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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| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
96b6a98e5e4cb0ddbfcd78b05bfbfcd8 |
| User & Date: | mistachkin 2017-02-20 19:13:37 |
Context
|
2017-02-20
| ||
| 23:32 | Correct a harmless typo in the previous check-in. check-in: 1589db01 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: 96b6a98e user: mistachkin tags: trunk | |
| 14:30 | Small grammar simplification. check-in: 0d8a868a user: drh tags: trunk | |
Changes
Changes to src/os_win.c.
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* 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 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
/*
* 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) + 4194304)
#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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* 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. */ |