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posix-timers: Sanitize overrun handling
The posix timer overrun handling is broken because the forwarding functions can return a huge number of overruns which does not fit in an int. As a consequence timer_getoverrun(2) and siginfo::si_overrun can turn into random number generators. The k_clock::timer_forward() callbacks return a 64 bit value now. Make k_itimer::ti_overrun[_last] 64bit as well, so the kernel internal accounting is correct. 3Remove the temporary (int) casts. Add a helper function which clamps the overrun value returned to user space via timer_getoverrun(2) or siginfo::si_overrun limited to a positive value between 0 and INT_MAX. INT_MAX is an indicator for user space that the overrun value has been clamped. Reported-by: Team OWL337 <firstname.lastname@example.org> Signed-off-by: Thomas Gleixner <email@example.com> Acked-by: John Stultz <firstname.lastname@example.org> Cc: Peter Zijlstra <email@example.com> Cc: Michael Kerrisk <firstname.lastname@example.org> Link: https://email@example.com
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