[Bug 3735] The ngroups variable may be set to a negative value when calling sysconf(_SC_NGROUPS_MAX)
bugzilla-daemon at mindrot.org
bugzilla-daemon at mindrot.org
Thu Sep 12 08:24:53 AEST 2024
https://bugzilla.mindrot.org/show_bug.cgi?id=3735
Darren Tucker <dtucker at dtucker.net> changed:
What |Removed |Added
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CC| |dtucker at dtucker.net
--- Comment #1 from Darren Tucker <dtucker at dtucker.net> ---
> The ngroups variable can be set to a negative value when calling
> sysconf(_SC_NGROUPS_MAX)
That's true...
> and this value is then used without checking in the xcalloc function
but that's not true. It's only ever used to increase ngroups beyond
NGROUPS_MAX. If the sysconf returns -1, that'll be less than
NGROUPS_MAX and it's not used:
ngroups = NGROUPS_MAX;
#if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX));
#endif
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