On Tue, Oct 13, 2020 at 02:34:16AM +0100, Dmitry Safonov wrote: > Don't allow splitting of vm_special_mapping's. > It affects vdso/vvar areas. Uprobes have only one page in xol_area so > they aren't affected. > > Those restrictions were enforced by checks in .mremap() callbacks. > Restrict resizing with generic .split() callback. > > Signed-off-by: Dmitry Safonov <dima@xxxxxxxxxx> > --- > arch/arm/kernel/vdso.c | 9 --------- > arch/arm64/kernel/vdso.c | 41 +++------------------------------------ > arch/mips/vdso/genvdso.c | 4 ---- > arch/s390/kernel/vdso.c | 11 +---------- > arch/x86/entry/vdso/vma.c | 17 ---------------- > mm/mmap.c | 12 ++++++++++++ > 6 files changed, 16 insertions(+), 78 deletions(-) For arm64: Acked-by: Will Deacon <will@xxxxxxxxxx> Will
