Unpatchable syscalls: ones at end of basic block, like clock_nanosleep - Githubissues

reverie-rs / reverie

trace and intercept linux syscalls.

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

Open rrnewton opened 5 years ago

rrnewton commented 5 years ago

Example from https://github.com/iu-parfunc/systrace/issues/24#issuecomment-472962443, 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)