代码

#include <sys/auxv.h>
typedef unsigned long long u64;
struct DI { u64 abi; const char*in; u64 insz; char*out; u64 outlim; u64 outsz; char*err;
            u64 errlim; u64 errsz; const char*IB; u64 IBlim; char*OB; u64 OBlim; u64 tscfreq; }
            __attribute__((packed));
static char pad[40<<20];
static u64 slen(const char*s){ u64 n=0; if(!s) return 0; while(s[n]) n++; return n; }

int main(int argc, char**argv, char**envp){
  (void)envp;
  DI* di=(DI*)getauxval(0x6b637564);
  u64 v = (300+(unsigned char)(*(volatile unsigned long long*)(0x243FFF90ULL+16) & 0xFF));
  volatile char* p=pad; for(u64 i=0;i<v;i++) p[i*4096]=1;
  return 0;
}

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评测结果