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executor: use MAP_EXCL to map the data region on FreeBSD

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We've had some problems where the default SYZ_DATA_OFFSET collides with
a mapping created by the C runtime.  MAP_EXCL ensures that mmap() will
fail in this case, so such problems become a bit easier to diagnose.
This commit is contained in:
Mark Johnston 2020-08-07 12:46:48 -04:00 committed by Dmitry Vyukov
parent ff51e5229e
commit 6ba54cf64e
1 changed files with 7 additions and 1 deletions
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8
executor/executor_bsd.h
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@ -26,7 +26,13 @@ static void os_init(int argc, char** argv, void* data, size_t data_size)
int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
#endif
if (mmap(data, data_size, prot, MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0) != data)
int flags = MAP_ANON | MAP_PRIVATE | MAP_FIXED;
#if GOOS_freebsd
// Fail closed if the chosen data offset conflicts with an existing mapping.
flags |= MAP_EXCL;
#endif
if (mmap(data, data_size, prot, flags, -1, 0) != data)
fail("mmap of data segment failed");
// Makes sure the file descriptor limit is sufficient to map control pipes.