c/pve-kernel-lowlatency-qoup
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

add follow-up fix for CVE-2017-100364 fix

Browse Source
This commit is contained in:
Fabian Grünbichler 2017-06-22 09:23:11 +02:00
parent 3905cd6842
commit 7c01aa8df7
2 changed files with 55 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Makefile
View File

@ -243,6 +243,7 @@ ${KERNEL_SRC}/README ${KERNEL_CFG_ORG}: ${KERNEL_SRC_SUBMODULE} | submodules
cd ${KERNEL_SRC}; patch -p1 < ../CVE-2017-9242-ipv6-fix-out-of-bound-writes-in-__ip6_append_data.patch
cd ${KERNEL_SRC}; patch -p1 < ../pinctl-amd-ryzen-01-make-use-of-raw_spinlock-variants.patch
cd ${KERNEL_SRC}; patch -p1 < ../pinctl-amd-ryzen-02-Use-regular-interrupt-instead-of-chained.patch
cd ${KERNEL_SRC}; patch -p1 < ../mm-fix-new-crash-in-unmapped_area_topdown.patch
sed -i ${KERNEL_SRC}/Makefile -e 's/^EXTRAVERSION.*$$/EXTRAVERSION=${EXTRAVERSION}/'
touch $@

54
mm-fix-new-crash-in-unmapped_area_topdown.patch Normal file
View File

@ -0,0 +1,54 @@
From f4cb767d76cf7ee72f97dd76f6cfa6c76a5edc89 Mon Sep 17 00:00:00 2001
From: Hugh Dickins <hughd@google.com>
Date: Tue, 20 Jun 2017 02:10:44 -0700
Subject: [PATCH] mm: fix new crash in unmapped_area_topdown()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Trinity gets kernel BUG at mm/mmap.c:1963! in about 3 minutes of
mmap testing. That's the VM_BUG_ON(gap_end < gap_start) at the
end of unmapped_area_topdown(). Linus points out how MAP_FIXED
(which does not have to respect our stack guard gap intentions)
could result in gap_end below gap_start there. Fix that, and
the similar case in its alternative, unmapped_area().
Cc: stable@vger.kernel.org
Fixes: 1be7107fbe18 ("mm: larger stack guard gap, between vmas")
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Debugged-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---
mm/mmap.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 8e07976d5e47..290b77d9a01e 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1817,7 +1817,8 @@ unsigned long unmapped_area(struct vm_unmapped_area_info *info)
/* Check if current node has a suitable gap */
if (gap_start > high_limit)
return -ENOMEM;
- if (gap_end >= low_limit && gap_end - gap_start >= length)
+ if (gap_end >= low_limit &&
+ gap_end > gap_start && gap_end - gap_start >= length)
goto found;
/* Visit right subtree if it looks promising */
@@ -1920,7 +1921,8 @@ unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info)
gap_end = vm_start_gap(vma);
if (gap_end < low_limit)
return -ENOMEM;
- if (gap_start <= high_limit && gap_end - gap_start >= length)
+ if (gap_start <= high_limit &&
+ gap_end > gap_start && gap_end - gap_start >= length)
goto found;
/* Visit left subtree if it looks promising */
--
2.11.0