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libroot: randomize position of areas created by mmap()

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When mmap() is invoked without specifying address hint B_RANDOMIZED_ANY_ADDRESS
is used.
Otherwise, unless MAP_FIXED flag is set (which requires mmap() to return an area
positioned exactly at given address), B_RANDOMIZED_BASE_ADDRESS is used.
This commit is contained in:
Pawel Dziepak 2013-03-05 21:37:31 +01:00
parent 02cceebe40
commit 537d84a07c
1 changed files with 5 additions and 1 deletions
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6
src/system/libroot/posix/sys/mman.cpp
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@ -113,9 +113,13 @@ mmap(void* address, size_t length, int protection, int flags, int fd,
int mapping = (flags & MAP_SHARED) != 0 int mapping = (flags & MAP_SHARED) != 0
? REGION_NO_PRIVATE_MAP : REGION_PRIVATE_MAP; ? REGION_NO_PRIVATE_MAP : REGION_PRIVATE_MAP;
uint32 addressSpec = address == NULL ? B_ANY_ADDRESS : B_BASE_ADDRESS; uint32 addressSpec;
if ((flags & MAP_FIXED) != 0) if ((flags & MAP_FIXED) != 0)
addressSpec = B_EXACT_ADDRESS; addressSpec = B_EXACT_ADDRESS;
else if (address != NULL)
addressSpec = B_RANDOMIZED_BASE_ADDRESS;
else
addressSpec = B_RANDOMIZED_ANY_ADDRESS;
uint32 areaProtection = 0; uint32 areaProtection = 0;
if ((protection & PROT_READ) != 0) if ((protection & PROT_READ) != 0)