lkl: Remove the stat symbol hijack

We are hijacking `stat`, where the size of the target struct is
dependent on the wordsize. Delegating to `__xstat64` is incorrect, as it
unconditionally uses the stat64 layout and will result in an out-of-bounds
write on 32-bit architectures.

The replacement would be to use `__xstat` as the implementation instead,
but the requirements on the `vers` parameter make it hard to portably
call.

Since the symbol just delegates to the real implementation
unconditionally and therefore does not seem to have a deeper purpose,
just remove it.

Fixes: d4b9b65 ("lkl: update dpdk version to 17.02 from 2.2")
Signed-off-by: Tim Schumacher <[email protected]>

Author: timschumi

tools/lkl/lib/hijack/hijack.c

@@ -586,15 +586,6 @@ void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
 	return lkl_sys_mmap(addr, length, prot, flags, fd, offset);
 }
 
-#ifndef __ANDROID__
-HOST_CALL(__xstat64)
-int stat(const char *pathname, struct stat *buf)
-{
-	CHECK_HOST_CALL(__xstat64);
-	return host___xstat64(0, pathname, buf);
-}
-#endif
-
 ssize_t send(int fd, const void *buf, size_t len, int flags)
 {
 	return sendto(fd, buf, len, flags, 0, 0);