Date: Sat, 30 Mar 2019 14:48:23 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 169608] [libc] the mmap(), mprotect(), and munmap() functions get screwed by some corner-case arguments Message-ID: <bug-169608-227-DhJeb5HTyB@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-169608-227@https.bugs.freebsd.org/bugzilla/> References: <bug-169608-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=169608 --- Comment #3 from Konstantin Belousov <kib@FreeBSD.org> --- (In reply to Glenn Weinberg from comment #2) What happens is (all arithmetic is done using unsigned native register size): - we truncate the base address down to the page boundary - size is increased by the truncated amount - size is rounded up to the page boundary - if base + size < base, we decline - base is set to max(min user address, base) - end is set to min(max user address, base + size) - base > end, base = end I think that corner cases of this algorithm are put in stone after 30 years of FreeBSD history. In particular, I do not think we can remove the automatic realignment. -- You are receiving this mail because: You are the assignee for the bug.help
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