On Thu, Mar 02, 2023 at 11:10:03AM -0800, Linus Torvalds wrote: > On Thu, Mar 2, 2023 at 11:03 AM Linus Torvalds > <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > > > > It might be best if we actually exposed it as a SLAB_SKIP_ZERO thing, > > just to make it possible to say - exactly in situations like this - > > that this particular slab cache has no advantage from pre-zeroing. > > Actually, maybe it's just as well to keep it per-allocation, and just > special-case getname_flags() itself. > > We could replace the __getname() there with just a > > kmem_cache_alloc(names_cachep, GFP_KERNEL | __GFP_SKIP_ZERO); > > we're going to overwrite the beginning of the buffer with the path we > copy from user space, and then we'd have to make people comfortable > with the fact that even with zero initialization hardening on, the > space after the filename wouldn't be initialized... ACK; same in getname_kernel() and sys_getcwd(), at the very least.
