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Unpatchable syscalls: ones at end of basic block, like clock_nanosleep #27

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rrnewton opened this issue Mar 15, 2019 · 0 comments
Open

Unpatchable syscalls: ones at end of basic block, like clock_nanosleep #27

rrnewton opened this issue Mar 15, 2019 · 0 comments

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@rrnewton
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rrnewton commented Mar 15, 2019 •
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Example from #24 (comment), nanosleep is often the last thing in the basic block:

syscall
label: xx
yyy

Proposed solutions:

  • Back-tracking (like LiteInst)
  • Instruction Punning (but only with a "natural pun" that keeps yyy, turning it into a SIGILL would be no good for a function entry)
@rrnewton rrnewton changed the title Unpatchable syscalls: ones at end of basic block, like nanosleep Unpatchable syscalls: ones at end of basic block, like clock_nanosleep Mar 15, 2019
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