Here's how this patch looks like when reading the manual page:
$ MANWIDTH=64 diffman-git HEAD^
--- HEAD^^:man/man3/aligned_alloc.3
+++ HEAD^:man/man3/aligned_alloc.3
@@ -52,6 +52,39 @@ STANDARDS
HISTORY
glibc 2.16. C11, POSIX.1‐2024.
+ C11
+ In C11, the specification of this function had several is‐
+ sues.
+
+ • size had to be a multiple of alignment. Otherwise, the
+ behavior was undefined.
+
+ Some implementations still implement that restriction,
+ or claim to have it.
+
+ OpenBSD
+ The function reports an error if this restric‐
+ tion is violated, without exploiting the UB.
+
+ FreeBSD
+ jemalloc
+ The documentation claims to have this restric‐
+ tion, but the implementation works correctly if
+ it is violated.
+
+ It was only a theoretical UB. No known implementation
+ has ever exploited this UB.
+
+ This restriction was removed in C17.
+
+ • If alignment was not a power of two, the behavior was
+ undefined.
+
+ No implementations ever exploited this UB. It was only
+ a theoretical UB.
+
+ This UB was removed in C17.
+
NOTES
On many systems there are alignment restrictions, for ex‐
ample, on buffers used for direct block device I/O. POSIXCheers, Alex -- <https://www.alejandro-colomar.es>
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