This is a note to let you know that I've just added the patch titled x86/mm/32: Set the '__vmalloc_start_set' flag in initmem_init() to the 4.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-mm-32-set-the-__vmalloc_start_set-flag-in-initmem_init.patch and it can be found in the queue-4.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 861ce4a3244c21b0af64f880d5bfe5e6e2fb9e4a Mon Sep 17 00:00:00 2001 From: Laura Abbott <labbott@xxxxxxxxxx> Date: Mon, 8 May 2017 14:23:16 -0700 Subject: x86/mm/32: Set the '__vmalloc_start_set' flag in initmem_init() From: Laura Abbott <labbott@xxxxxxxxxx> commit 861ce4a3244c21b0af64f880d5bfe5e6e2fb9e4a upstream. '__vmalloc_start_set' currently only gets set in initmem_init() when !CONFIG_NEED_MULTIPLE_NODES. This breaks detection of vmalloc address with virt_addr_valid() with CONFIG_NEED_MULTIPLE_NODES=y, causing a kernel crash: [mm/usercopy] 517e1fbeb6: kernel BUG at arch/x86/mm/physaddr.c:78! Set '__vmalloc_start_set' appropriately for that case as well. Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx> Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Fixes: dc16ecf7fd1f ("x86-32: use specific __vmalloc_start_set flag in __virt_addr_valid") Link: http://lkml.kernel.org/r/1494278596-30373-1-git-send-email-labbott@xxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/mm/numa_32.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/mm/numa_32.c +++ b/arch/x86/mm/numa_32.c @@ -100,5 +100,6 @@ void __init initmem_init(void) printk(KERN_DEBUG "High memory starts at vaddr %08lx\n", (ulong) pfn_to_kaddr(highstart_pfn)); + __vmalloc_start_set = true; setup_bootmem_allocator(); } Patches currently in stable-queue which might be from labbott@xxxxxxxxxx are queue-4.11/x86-mm-32-set-the-__vmalloc_start_set-flag-in-initmem_init.patch