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Merge pull request #2451 from janisozaur/memcheck 

POSIX: use mincore to detect impending doom
This commit is contained in:
Duncan 2015-12-09 00:01:18 +00:00
parent 08fc36ee49 3d0fcc948d
commit a7823bd958
1 changed files with 38 additions and 1 deletions
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39
src/openrct2.c
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@ -513,6 +513,43 @@ static bool openrct2_setup_rct2_segment()
off_t file_size = 6750208;
int len = 0x01429000 - 0x8a4000; // 0xB85000, 12079104 bytes or around 11.5MB
int pageSize = getpagesize();
int numPages = (len + pageSize - 1) / pageSize;
unsigned char *dummy = malloc(numPages);
int err = mincore((void *)0x8a4000, len, dummy);
bool pagesDirty = false;
if (err != 0)
{
err = errno;
#ifdef __linux__
// On Linux ENOMEM means all requested range is unmapped
if (err != ENOMEM)
{
pagesDirty = true;
perror("mincore");
}
#else
pagesDirty = true;
perror("mincore");
#endif // __linux__
} else {
log_warning("mincore ok");
for (int i = 0; i < numPages; i++)
{
if (dummy[i] != 0)
{
pagesDirty = true;
void *start = (void *)0x8a4000 + i * pageSize;
void *end = (void *)0x8a4000 + (i + 1) * pageSize - 1;
log_warning("page %p - %p has flags: %x, you're in for bad time!", start, end, dummy[i]);
}
}
}
free(dummy);
if (pagesDirty)
{
log_error("Found already mapped pages in region we want to claim. This means something accessed memory before we got to and following mmap (or next malloc) call will likely fail.");
}
// section: rw data
gDataSegment = mmap((void *)0x8a4000, len, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANONYMOUS | MAP_SHARED, 0, 0);
if (gDataSegment != (void *)0x8a4000) {
@ -530,7 +567,7 @@ static bool openrct2_setup_rct2_segment()
}
void *fbase = mmap(NULL, file_size, PROT_READ, MAP_PRIVATE, gExeFd, 0);
int err = errno;
err = errno;
log_warning("mmapped file to %p", fbase);
if (fbase == MAP_FAILED)
{