On 8/13/22 08:04, Kevin Kofler via devel wrote: > martin luther wrote: >> should we implement https://github.com/GrapheneOS/hardened_malloc/ >> it is hardened memory allocate it will increase the security of fedora >> according to the graphene os team it can be ported to linux as well need >> to look at it CCing Daniel Micay who wrote hardened_malloc. > There are several questions that come up: > * Against what exact threats does this protect? Use-after-free? Heap buffer > overflow? Others?> * How does it relate to _FORTIFY_SOURCE? Can they be used together? (If not, > it might actually reduce rather than increase the security of Fedora.)> * How does it perform, both in terms of speed and memory consumption > (overhead)? Better or worse than the glibc malloc? (If it is much worse than > the glibc malloc, it is not going to be a suitable default for Fedora.)> * How does it compare to the glibc malloc in terms of quality of > implementation issues, such as that realloc should avoid copying the whole > block whenever an in-place resize is possible? > * Can hardening be added to the existing glibc malloc implementation or is a > complete rewrite as the suggested one really needed?> * How do you suggest it getting used distro-wide instead of the glibc > implementation? Upstream's suggestion is to link it as an additional dynamic > shared object, so then the order of linking is important, and you also have > to take care to link it into all applications (and there are lots of build > systems out there). The alternative, I suppose, would be to modify glibc. > > Kevin Kofler -- Sincerely, Demi Marie Obenour (she/her/hers)
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