FreeBSD Bugzilla – Attachment 232981 Details for
Bug 263073
integer overflow in mstosbt, nstosbt and ustosbt
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Test case demonstrating the bug, and a solution
ustosbt.c (text/plain), 846 bytes, created by
Alan Somers
on 2022-04-05 20:53:56 UTC
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Description:
Test case demonstrating the bug, and a solution
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Creator:
Alan Somers
Created:
2022-04-05 20:53:56 UTC
Size:
846 bytes
patch
obsolete
>#include <sys/types.h> >#include <sys/time.h> >#include <stdio.h> > >static __inline sbintime_t >ustosbt2(int64_t _us) >{ > sbintime_t sb = 0; > >#ifdef KASSERT > KASSERT(_us >= 0, ("Negative values illegal for ustosbt: %jd", _us)); >#endif > if (_us >= 1000000) { > sb = (_us / 1000000) * SBT_1S; > _us = _us % 1000000; > } > /* 9223372036855 = ceil(2^63 / 1000000) */ > sb += ((_us * 9223372036855ull) + 0x7fffffff) >> 31; > return (sb); >} > > >int main(int argc, char **argv) { > int i; > int64_t us[] = {0, 1, 999999, 1000000, 1000001, 1999999, 2000000, > (1ll<<32) - 1, (1ll<<32)}; > > for (i=0; i < 9; i++) { > sbintime_t out = ustosbt(us[i]); > sbintime_t out2 = ustosbt2(us[i]); > > printf("ustosbt(%10ld) = %10ld.%010ld " > "ustosbt2 = %10ld.%010ld\n", > us[i], > out >> 32, out & 0xFFFFFFFF, > out2 >> 32, out2 & 0xFFFFFFFF); > } > return (0); >}
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bug 263073
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