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-updated the memory security checks, now wiiflow shouldn't crash anymore if invalid blocks are given into the memory manager, instead a debug warning will be given if detected

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This commit is contained in:
fix94.1 2013-09-06 14:14:59 +00:00
parent 40f8fe35fe
commit 5886fbdbe4
4 changed files with 27 additions and 18 deletions
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2
portlibs/include/pnglibconf.h
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@ -204,6 +204,6 @@
#define PNG_Z_DEFAULT_NOFILTER_STRATEGY 0 #define PNG_Z_DEFAULT_NOFILTER_STRATEGY 0
#define PNG_Z_DEFAULT_STRATEGY 1 #define PNG_Z_DEFAULT_STRATEGY 1
#define PNG_sCAL_PRECISION 5 #define PNG_sCAL_PRECISION 5
#define PNG_sRGB_PROFILE_CHECKS 2 #define PNG_sRGB_PROFILE_CHECKS 0
/* end of settings */ /* end of settings */
#endif /* PNGLCONF_H */ #endif /* PNGLCONF_H */

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portlibs/lib/libpng.a
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42
source/memory/mem2alloc.cpp
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@ -5,7 +5,7 @@
#include <algorithm> #include <algorithm>
#include <string.h> #include <string.h>
#include "lockMutex.hpp" #include "lockMutex.hpp"
#include "gecko/gecko.hpp"
void CMEM2Alloc::init(void *addr, void *end) void CMEM2Alloc::init(void *addr, void *end)
{ {
m_baseAddress = (SBlock *)(((u32)addr + 31) & ~31); m_baseAddress = (SBlock *)(((u32)addr + 31) & ~31);
@ -38,6 +38,14 @@ unsigned int CMEM2Alloc::usableSize(void *p)
return p == 0 ? 0 : ((SBlock *)p - 1)->s * sizeof (SBlock); return p == 0 ? 0 : ((SBlock *)p - 1)->s * sizeof (SBlock);
} }
bool CMEM2Alloc::is_valid(const SBlock *block)
{
if((u32)block >= (u32)m_baseAddress && (u32)block < (u32)m_endAddress)
return true;
gprintf("WARNING: Found invalid memory location!\n");
return false;
}
void *CMEM2Alloc::allocate(unsigned int s) void *CMEM2Alloc::allocate(unsigned int s)
{ {
if (s == 0) if (s == 0)
@ -92,7 +100,7 @@ void *CMEM2Alloc::allocate(unsigned int s)
j->next = i->next; j->next = i->next;
j->prev = i; j->prev = i;
i->next = j; i->next = j;
if((((u32)j->next) & 0xf0000000) != 0) if(j->next != 0 && is_valid(j->next))
j->next->prev = j; j->next->prev = j;
} }
return (void *)(i + 1); return (void *)(i + 1);
@ -109,24 +117,26 @@ void CMEM2Alloc::release(void *p)
// If there are no other blocks following yet, // If there are no other blocks following yet,
// set the remaining size to free size. - Dimok // set the remaining size to free size. - Dimok
if((((u32)i->next) & 0xf0000000) == 0) if(i->next == 0)
i->s = m_endAddress - i - 1; i->s = m_endAddress - i - 1;
// Merge with previous block // Merge with previous block
if ((((u32)i->prev) & 0xf0000000) != 0 && i->prev->f) if (i->prev != 0 && is_valid(i->prev) && is_valid(i->prev->next) && i->prev->f)
{ {
i = i->prev; i = i->prev;
i->s += i->next->s + 1; i->s += i->next->s + 1;
i->next = i->next->next; if(i->next->next != 0 && is_valid(i->next->next))
if((((u32)i->next) & 0xf0000000) != 0) {
i->next = i->next->next;
i->next->prev = i; i->next->prev = i;
}
} }
// Merge with next block // Merge with next block
if ((((u32)i->next) & 0xf0000000) != 0 && i->next->f) if (i->next != 0 && is_valid(i->next) && i->next->f)
{ {
i->s += i->next->s + 1; i->s += i->next->s + 1;
i->next = i->next->next; i->next = i->next->next;
if((((u32)i->next) & 0xf0000000) != 0) if(i->next != 0 && is_valid(i->next))
i->next->prev = i; i->next->prev = i;
} }
} }
@ -154,18 +164,18 @@ void *CMEM2Alloc::reallocate(void *p, unsigned int s)
} }
// Last block // Last block
if (((((u32)i->next) & 0xf0000000) == 0) && i + s + 1 < m_endAddress) if (i->next == 0 && i + s + 1 < m_endAddress)
{ {
i->s = s; i->s = s;
return p; return p;
} }
// Size <= current size + next block // Size <= current size + next block
if ((((u32)i->next) & 0xf0000000) != 0 && i->s < s && i->next->f && i->s + i->next->s + 1 >= s) if (i->next != 0 && is_valid(i->next) && i->s < s && i->next->f && i->s + i->next->s + 1 >= s)
{ {
// Merge // Merge
i->s += i->next->s + 1; i->s += i->next->s + 1;
i->next = i->next->next; i->next = i->next->next;
if((((u32)i->next) & 0xf0000000) != 0) if(i->next != 0 && is_valid(i->next))
i->next->prev = i; i->next->prev = i;
} }
// Size <= current size // Size <= current size
@ -181,7 +191,7 @@ void *CMEM2Alloc::reallocate(void *p, unsigned int s)
j->next = i->next; j->next = i->next;
j->prev = i; j->prev = i;
i->next = j; i->next = j;
if((((u32)j->next) & 0xf0000000) != 0) if(j->next != 0 && is_valid(j->next))
j->next->prev = j; j->next->prev = j;
} }
return p; return p;
@ -208,13 +218,11 @@ unsigned int CMEM2Alloc::FreeSize()
for(i = m_first; i != 0; i = i->next) for(i = m_first; i != 0; i = i->next)
{ {
if(i->f && (((u32)i->next) & 0xf0000000) != 0) if(i->f && i->next != 0 && is_valid(i->next))
size += i->s; size += i->s;
else if(i->f && i->next == 0)
else if(i->f && (((u32)i->next) & 0xf0000000) == 0)
size += m_endAddress - i - 1; size += m_endAddress - i - 1;
else if(!i->f && i->next == 0)
else if(!i->f && (((u32)i->next) & 0xf0000000) == 0)
size += m_endAddress - i - i->s - 1; size += m_endAddress - i - i->s - 1;
} }

1
source/memory/mem2alloc.hpp
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@ -31,6 +31,7 @@ private:
SBlock *prev; SBlock *prev;
bool f; bool f;
} __attribute__((aligned(32))); } __attribute__((aligned(32)));
bool is_valid(const SBlock *block);
SBlock *m_baseAddress; SBlock *m_baseAddress;
SBlock *m_endAddress; SBlock *m_endAddress;
SBlock *m_first; SBlock *m_first;