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common: Cast via uintptr_t rather than unsigned long in UNCONST (#581)

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On ILP32 and LP64 systems, unsigned long is sufficient to round-trip
pointers, but on LLP64 systems it is too small, and on systems like
CHERI where pointers are capabilities, it does not propagate capability
metadata, and casting back to a pointer to yield a pointer that cannot
be dereferenced.

Instead, cast via uintptr_t to ensure we always use an integral type
that can losslessly round-trip pointers.
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Jessica Clarke 2026-01-09 21:56:25 +00:00 committed by GitHub
parent cd0b26953c
commit 2c1db0494c
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src/common.h
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@ -55,7 +55,7 @@
#define MAX(a,b) ((/*CONSTCOND*/(a)>(b))?(a):(b))
#endif
#define UNCONST(a) ((void *)(unsigned long)(const void *)(a))
#define UNCONST(a) ((void *)(uintptr_t)(const void *)(a))
#define STRINGIFY(a) #a
#define TOSTRING(a) STRINGIFY(a)
#define UNUSED(a) (void)(a)