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Subject[tip:x86/urgent] x86/mm/32: Set the '__vmalloc_start_set' flag in initmem_init()
Commit-ID:  861ce4a3244c21b0af64f880d5bfe5e6e2fb9e4a
Gitweb: http://git.kernel.org/tip/861ce4a3244c21b0af64f880d5bfe5e6e2fb9e4a
Author: Laura Abbott <labbott@redhat.com>
AuthorDate: Mon, 8 May 2017 14:23:16 -0700
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 May 2017 08:12:27 +0200

x86/mm/32: Set the '__vmalloc_start_set' flag in initmem_init()

'__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@intel.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
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@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/mm/numa_32.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
index 6b7ce62..aca6295 100644
--- 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();
}
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