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Protect mmx2 filter code buffers so they are not executable and writeable at

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the same time (only mmap for now).

Originally committed as revision 29509 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Ramiro Polla 2009-08-13 18:29:54 +00:00
parent b0e1343b85
commit 0728778885
1 changed files with 7 additions and 2 deletions
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9
libswscale/swscale.c
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@ -2814,8 +2814,8 @@ SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat, int d
if (c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR))
{
#ifdef MAP_ANONYMOUS
c->lumMmx2FilterCode = mmap(NULL, MAX_MMX2_FILTER_CODE_SIZE, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
c->chrMmx2FilterCode = mmap(NULL, MAX_MMX2_FILTER_CODE_SIZE, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
c->lumMmx2FilterCode = mmap(NULL, MAX_MMX2_FILTER_CODE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
c->chrMmx2FilterCode = mmap(NULL, MAX_MMX2_FILTER_CODE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
#elif HAVE_VIRTUALALLOC
c->lumMmx2FilterCode = VirtualAlloc(NULL, MAX_MMX2_FILTER_CODE_SIZE, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
c->chrMmx2FilterCode = VirtualAlloc(NULL, MAX_MMX2_FILTER_CODE_SIZE, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
@ -2831,6 +2831,11 @@ SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat, int d
initMMX2HScaler( dstW, c->lumXInc, c->lumMmx2FilterCode, c->lumMmx2Filter, c->lumMmx2FilterPos, 8);
initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode, c->chrMmx2Filter, c->chrMmx2FilterPos, 4);
#ifdef MAP_ANONYMOUS
mprotect(c->lumMmx2FilterCode, MAX_MMX2_FILTER_CODE_SIZE, PROT_EXEC | PROT_READ);
mprotect(c->chrMmx2FilterCode, MAX_MMX2_FILTER_CODE_SIZE, PROT_EXEC | PROT_READ);
#endif
}
#endif /* defined(COMPILE_MMX2) */
} // initialize horizontal stuff