On Tue, Mar 8, 2022 at 4:17 PM Vasily Gorbik <gor@xxxxxxxxxxxxx> wrote: > > On Mon, Jan 24, 2022 at 07:05:05PM +0100, andrey.konovalov@xxxxxxxxx wrote: > > From: Andrey Konovalov <andreyknvl@xxxxxxxxxx> > > > > The kernel can use to allocate executable memory. The only supported way > > to do that is via __vmalloc_node_range() with the executable bit set in > > the prot argument. (vmap() resets the bit via pgprot_nx()). > > > > Once tag-based KASAN modes start tagging vmalloc allocations, executing > > code from such allocations will lead to the PC register getting a tag, > > which is not tolerated by the kernel. > > > > Only tag the allocations for normal kernel pages. > > > > Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> > > This breaks s390 and produce huge amount of false positives. > I haven't been testing linux-next with KASAN for while, now tried it with > next-20220308 and bisected false positives to this commit. > > Any idea what is going wrong here? Hi Vasily, Could you try the attached fix? Thanks!
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s390-kasan-vmalloc.fix
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