This is a note to let you know that I've just added the patch titled
x86/mm: Fix boot crash caused by incorrect loop count calculation in sync_global_pgds()
to the 4.9-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-fix-boot-crash-caused-by-incorrect-loop-count-calculation-in-sync_global_pgds.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fc5f9d5f151c9fff21d3d1d2907b888a5aec3ff7 Mon Sep 17 00:00:00 2001
From: Baoquan He <bhe@xxxxxxxxxx>
Date: Thu, 4 May 2017 10:25:47 +0800
Subject: x86/mm: Fix boot crash caused by incorrect loop count calculation in sync_global_pgds()
From: Baoquan He <bhe@xxxxxxxxxx>
commit fc5f9d5f151c9fff21d3d1d2907b888a5aec3ff7 upstream.
Jeff Moyer reported that on his system with two memory regions 0~64G and
1T~1T+192G, and kernel option "memmap=192G!1024G" added, enabling KASLR
will make the system hang intermittently during boot. While adding 'nokaslr'
won't.
The back trace is:
Oops: 0000 [#1] SMP
RIP: memcpy_erms()
[ .... ]
Call Trace:
pmem_rw_page()
bdev_read_page()
do_mpage_readpage()
mpage_readpages()
blkdev_readpages()
__do_page_cache_readahead()
force_page_cache_readahead()
page_cache_sync_readahead()
generic_file_read_iter()
blkdev_read_iter()
__vfs_read()
vfs_read()
SyS_read()
entry_SYSCALL_64_fastpath()
This crash happens because the for loop count calculation in sync_global_pgds()
is not correct. When a mapping area crosses PGD entries, we should
calculate the starting address of region which next PGD covers and assign
it to next for loop count, but not add PGDIR_SIZE directly. The old
code works right only if the mapping area is an exact multiple of PGDIR_SIZE,
otherwize the end region could be skipped so that it can't be synchronized
to all other processes from kernel PGD init_mm.pgd.
In Jeff's system, emulated pmem area [1024G, 1216G) is smaller than
PGDIR_SIZE. While 'nokaslr' works because PAGE_OFFSET is 1T aligned, it
makes this area be mapped inside one PGD entry. With KASLR enabled,
this area could cross two PGD entries, then the next PGD entry won't
be synced to all other processes. That is why we saw empty PGD.
Fix it.
Reported-by: Jeff Moyer <jmoyer@xxxxxxxxxx>
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Jinbum Park <jinb.park7@xxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Garnier <thgarnie@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Yasuaki Ishimatsu <yasu.isimatu@xxxxxxxxx>
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1493864747-8506-1-git-send-email-bhe@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/mm/init_64.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -94,10 +94,10 @@ __setup("noexec32=", nonx32_setup);
*/
void sync_global_pgds(unsigned long start, unsigned long end, int removed)
{
- unsigned long address;
+ unsigned long addr;
- for (address = start; address <= end; address += PGDIR_SIZE) {
- const pgd_t *pgd_ref = pgd_offset_k(address);
+ for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
+ const pgd_t *pgd_ref = pgd_offset_k(addr);
struct page *page;
/*
@@ -113,7 +113,7 @@ void sync_global_pgds(unsigned long star
pgd_t *pgd;
spinlock_t *pgt_lock;
- pgd = (pgd_t *)page_address(page) + pgd_index(address);
+ pgd = (pgd_t *)page_address(page) + pgd_index(addr);
/* the pgt_lock only for Xen */
pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
spin_lock(pgt_lock);
Patches currently in stable-queue which might be from bhe@xxxxxxxxxx are
queue-4.9/x86-mm-fix-boot-crash-caused-by-incorrect-loop-count-calculation-in-sync_global_pgds.patch