Page MenuHomeFreeBSD

Fix divide-by-zero panic when ALSR is enabled and superpages disabled

Authored by jah on Mon, Feb 15, 3:08 AM.



When locating the anonymous memory region for a vm_map with ASLR
enabled, we try to keep the slid base address aligned on a superpage
boundary to minimize pagetable fragmentation and maximize the potential
usage of superpage mappings. We can't (portably) do this if superpages
have been disabled by loader tunable and pagesizes[1] is 0, and it
would be less beneficial in that case anyway.

PR: 253511
Reported by:
MFC after: 1 week

Diff Detail

R10 FreeBSD src repository
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.