| Date | Mon, 27 May 2019 15:37:20 +0100 | From | Catalin Marinas <> | Subject | Re: [PATCH v15 05/17] arms64: untag user pointers passed to memory syscalls |
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On Mon, May 06, 2019 at 06:30:51PM +0200, Andrey Konovalov wrote: > This patch is a part of a series that extends arm64 kernel ABI to allow to > pass tagged user pointers (with the top byte set to something else other > than 0x00) as syscall arguments. > > This patch allows tagged pointers to be passed to the following memory > syscalls: brk, get_mempolicy, madvise, mbind, mincore, mlock, mlock2, > mmap, mmap_pgoff, mprotect, mremap, msync, munlock, munmap, > remap_file_pages, shmat and shmdt. > > This is done by untagging pointers passed to these syscalls in the > prologues of their handlers. > > Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Actually, I don't think any of these wrappers get called (have you tested this patch?). Following commit 4378a7d4be30 ("arm64: implement syscall wrappers"), I think we have other macro names for overriding the sys_* ones.
-- Catalin
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