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| author | Jiri Kosina <jkosina@suse.cz> | 2017-06-22 16:37:55 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2017-06-22 16:37:55 +0200 |
| commit | 414ea9fcc8bd854a7201242e86e2b1c733cbc49e (patch) | |
| tree | f400fe24000021c7244bfd3354b917e410133c68 | |
| parent | fa1fcfd11b039bc91a7a4bba4d42e1b4d53262a7 (diff) | |
| parent | 95bb14bf448753117d5622a5fc5ec3e9ee6cbdf7 (diff) | |
Merge remote-tracking branch 'origin/users/mhocko/SLE11-SP4/for-next_EMBARGO' into SLE11-SP4_EMBARGOrpm-3.0.101-107
5 files changed, 128 insertions, 14 deletions
diff --git a/patches.fixes/0001-mm-mmap-do-not-blow-on-PROT_NONE-MAP_FIXED-holes-in-.patch b/patches.fixes/0001-mm-mmap-do-not-blow-on-PROT_NONE-MAP_FIXED-holes-in-.patch new file mode 100644 index 0000000000..9cbd966add --- /dev/null +++ b/patches.fixes/0001-mm-mmap-do-not-blow-on-PROT_NONE-MAP_FIXED-holes-in-.patch @@ -0,0 +1,69 @@ +From 5a3d0bf0a4660bad63455830225c212ef6869392 Mon Sep 17 00:00:00 2001 +From: Michal Hocko <mhocko@suse.com> +Date: Thu, 22 Jun 2017 13:27:30 +0200 +Subject: [PATCH] mm, mmap: do not blow on PROT_NONE MAP_FIXED holes in the + stack +Patch-mainline: no, fixed differently +References: bnc#1039348, bnc#1045340, bnc#1045406 + +"mm: enlarge stack guard gap" has introduced a regression in some JVM +environments which are trying to implement their own stack guard page. +hey are punching a new MAP_FIXED mapping inside the existing stack +Vma: +(gdb) bt + #0 0xf7fd9f89 in __kernel_vsyscall () + #1 0xf7454508 in mmap () from /lib/libc.so.6 + #2 0xf7a51cdb in os::commit_memory(char*, unsigned int, bool) () from /opt/novell/groupwise/client/java/lib/i386/client/libjvm.so + #3 0xf7afd1be in JavaThread::create_stack_guard_pages() () from /opt/novell/groupwise/client/java/lib/i386/client/libjvm.so + #4 0xf7afedd3 in Threads::create_vm(JavaVMInitArgs*, bool*) () from /opt/novell/groupwise/client/java/lib/i386/client/libjvm.so + #5 0xf7960566 in JNI_CreateJavaVM () from /opt/novell/groupwise/client/java/lib/i386/client/libjvm.so + #6 0x08048dc3 in LaunchJavaVm (argc=0, argv=0xffffd528, szPathToClientDir=0xffffd068 "/opt/novell/groupwise/client") at grpwisex.cpp:380 + #7 0x080497a3 in main (argc=1, argv=0xffffd524) at grpwisex.cpp:473 + +This will confuse expandable_stack_area into thinking that the stack +expansion would in fact get us too close to an existing non-stack vma +which is a correct behavior wrt. safety. It is a real regression on +the other hand. Let's work around the problem by considering PROT_NONE +mapping as a part of the stack. This is a gros hack but overflowing to +such a mapping would trap anyway an we only can hope that usespace +knows what it is doing and handle it propely. + +Debugged-by: Vlastimil Babka <vbabka@suse.cz> +Signed-off-by: Michal Hocko <mhocko@suse.com> + +--- + mm/mmap.c | 10 ++++++++-- + 1 file changed, 8 insertions(+), 2 deletions(-) + +diff --git a/mm/mmap.c b/mm/mmap.c +index 620e1e4e3296..1e722532f6c1 100644 +--- a/mm/mmap.c ++++ b/mm/mmap.c +@@ -2378,7 +2378,8 @@ unsigned long expandable_stack_area(struct vm_area_struct *vma, + if (!next) + goto out; + +- if (next->vm_flags & VM_GROWSUP) { ++ /* see comment in !CONFIG_STACK_GROWSUP */ ++ if ((next->vm_flags & VM_GROWSUP) || !(next->vm_flags & (VM_WRITE|VM_READ))) { + guard_gap = min(guard_gap, next->vm_start - address); + goto out; + } +@@ -2457,8 +2458,13 @@ unsigned long expandable_stack_area(struct vm_area_struct *vma, + * That's only ok if it's the same stack mapping + * that has gotten split or there is sufficient gap + * between mappings ++ * ++ * Please note that some application (e.g. Java) punches ++ * MAP_FIXED inside the stack and then PROT_NONE it ++ * to mimic a stack guard which will clash with our protection ++ * so pretend tha PROT_NONE vmas are OK + */ +- if (prev->vm_flags & VM_GROWSDOWN) { ++ if ((prev->vm_flags & VM_GROWSDOWN) || !(prev->vm_flags & (VM_WRITE|VM_READ))) { + guard_gap = min(guard_gap, address - prev->vm_end); + goto out; + } +-- +2.11.0 + diff --git a/patches.fixes/0002-mm-do-not-collapse-stack-gap-into-THP-fix.patch b/patches.fixes/0002-mm-do-not-collapse-stack-gap-into-THP-fix.patch new file mode 100644 index 0000000000..b4d1d8e37d --- /dev/null +++ b/patches.fixes/0002-mm-do-not-collapse-stack-gap-into-THP-fix.patch @@ -0,0 +1,40 @@ +From: Michal Hocko <mhocko@suse.com> +Subject: [PATCH] mm: do not collapse stack gap into THP +Patch-mainline: no, fixup for patches.fixes/0002-mm-do-not-collapse-stack-gap-into-THP.patch +References: bnc#1039348, CVE-2017-1000364 + +Willy Tarreau has noticed that my backport +(patches.fixes/0002-mm-do-not-collapse-stack-gap-into-THP.patch) is not +accounting THP_FAULT_FALLBACK properly. This is not a disaster because the +counter is only exported to the userspace and nothing really crucial depends on +it. It is good to fix though. Also we can move stack_guard_area check up +because there is no real need to even try anon_vma_prepare resp. +khugepaged_enter on the gap area. + +Signed-off-by: Michal Hocko <mhocko@suse.com> + +--- + mm/huge_memory.c | 8 +++++--- + 1 file changed, 5 insertions(+), 3 deletions(-) + +--- a/mm/huge_memory.c ++++ b/mm/huge_memory.c +@@ -679,13 +679,15 @@ int do_huge_pmd_anonymous_page(struct mm + pte_t *pte; + + if (haddr >= vma->vm_start && haddr + HPAGE_PMD_SIZE <= vma->vm_end) { ++ if (stack_guard_area(vma, haddr) || ++ stack_guard_area(vma, haddr + HPAGE_PMD_SIZE)) { ++ count_vm_event(THP_FAULT_FALLBACK); ++ goto out; ++ } + if (unlikely(anon_vma_prepare(vma))) + return VM_FAULT_OOM; + if (unlikely(khugepaged_enter(vma))) + return VM_FAULT_OOM; +- if (stack_guard_area(vma, haddr) || +- stack_guard_area(vma, haddr + HPAGE_PMD_SIZE)) +- goto out; + page = alloc_hugepage_vma(transparent_hugepage_defrag(vma), + vma, haddr, numa_node_id(), 0); + if (unlikely(!page)) { diff --git a/patches.fixes/mm-thp-fix-collapsing-of-hugepages-on-madvise.patch b/patches.fixes/mm-thp-fix-collapsing-of-hugepages-on-madvise.patch index 532fb7ab9c..1f63733ec4 100644 --- a/patches.fixes/mm-thp-fix-collapsing-of-hugepages-on-madvise.patch +++ b/patches.fixes/mm-thp-fix-collapsing-of-hugepages-on-madvise.patch @@ -86,16 +86,16 @@ Signed-off-by: Vlastimil Babka <vbabka@suse.cz> } --- a/mm/huge_memory.c +++ b/mm/huge_memory.c -@@ -673,7 +673,7 @@ int do_huge_pmd_anonymous_page(struct mm - if (haddr >= vma->vm_start && haddr + HPAGE_PMD_SIZE <= vma->vm_end) { +@@ -678,7 +678,7 @@ int do_huge_pmd_anonymous_page(struct mm + } if (unlikely(anon_vma_prepare(vma))) return VM_FAULT_OOM; - if (unlikely(khugepaged_enter(vma))) + if (unlikely(khugepaged_enter(vma, vma->vm_flags))) return VM_FAULT_OOM; - if (stack_guard_area(vma, haddr) || - stack_guard_area(vma, haddr + HPAGE_PMD_SIZE)) -@@ -1491,7 +1491,7 @@ int hugepage_madvise(struct vm_area_stru + gfp = alloc_hugepage_gfpmask(transparent_hugepage_defrag(vma), + 0); +@@ -1493,7 +1493,7 @@ int hugepage_madvise(struct vm_area_stru * register it here without waiting a page fault that * may not happen any time soon. */ @@ -104,7 +104,7 @@ Signed-off-by: Vlastimil Babka <vbabka@suse.cz> return -ENOMEM; break; case MADV_NOHUGEPAGE: -@@ -1623,7 +1623,8 @@ int __khugepaged_enter(struct mm_struct +@@ -1625,7 +1625,8 @@ int __khugepaged_enter(struct mm_struct return 0; } @@ -114,7 +114,7 @@ Signed-off-by: Vlastimil Babka <vbabka@suse.cz> { unsigned long hstart, hend; if (!vma->anon_vma) -@@ -1639,11 +1640,11 @@ int khugepaged_enter_vma_merge(struct vm +@@ -1641,11 +1642,11 @@ int khugepaged_enter_vma_merge(struct vm * If is_pfn_mapping() is true is_learn_pfn_mapping() must be * true too, verify it here. */ diff --git a/patches.suse/mm-thp-allocate-transparent-hugepages-on-local-node.patch b/patches.suse/mm-thp-allocate-transparent-hugepages-on-local-node.patch index 8676d3c51d..9edb82efd9 100644 --- a/patches.suse/mm-thp-allocate-transparent-hugepages-on-local-node.patch +++ b/patches.suse/mm-thp-allocate-transparent-hugepages-on-local-node.patch @@ -78,10 +78,10 @@ Signed-off-by: Vlastimil Babka <vbabka@suse.cz> struct page *page; unsigned long haddr = address & HPAGE_PMD_MASK; pte_t *pte; -@@ -686,8 +678,9 @@ int do_huge_pmd_anonymous_page(struct mm - if (stack_guard_area(vma, haddr) || - stack_guard_area(vma, haddr + HPAGE_PMD_SIZE)) - goto out; +@@ -688,8 +680,9 @@ int do_huge_pmd_anonymous_page(struct mm + return VM_FAULT_OOM; + if (unlikely(khugepaged_enter(vma))) + return VM_FAULT_OOM; - page = alloc_hugepage_vma(transparent_hugepage_defrag(vma), - vma, haddr, numa_node_id(), 0); + gfp = alloc_hugepage_gfpmask(transparent_hugepage_defrag(vma), @@ -90,7 +90,7 @@ Signed-off-by: Vlastimil Babka <vbabka@suse.cz> if (unlikely(!page)) { count_vm_event(THP_FAULT_FALLBACK); goto out; -@@ -914,10 +907,12 @@ int do_huge_pmd_wp_page(struct mm_struct +@@ -916,10 +909,12 @@ int do_huge_pmd_wp_page(struct mm_struct spin_unlock(&mm->page_table_lock); if (transparent_hugepage_enabled(vma) && @@ -107,7 +107,7 @@ Signed-off-by: Vlastimil Babka <vbabka@suse.cz> new_page = NULL; if (unlikely(!new_page)) { -@@ -1833,6 +1828,7 @@ static void collapse_huge_page(struct mm +@@ -1835,6 +1830,7 @@ static void collapse_huge_page(struct mm spinlock_t *ptl; int isolated; unsigned long hstart, hend; @@ -115,7 +115,7 @@ Signed-off-by: Vlastimil Babka <vbabka@suse.cz> VM_BUG_ON(address & ~HPAGE_PMD_MASK); #ifndef CONFIG_NUMA -@@ -1851,8 +1847,8 @@ static void collapse_huge_page(struct mm +@@ -1853,8 +1849,8 @@ static void collapse_huge_page(struct mm * mmap_sem in read mode is good idea also to allow greater * scalability. */ diff --git a/series.conf b/series.conf index 93cc97de73..f3f81c0866 100644 --- a/series.conf +++ b/series.conf @@ -1865,9 +1865,14 @@ patches.fixes/mm-gup-close-FOLL-MAP_PRIVATE-race.patch patches.fixes/mm-mempolicy.c-fix-error-handling-in-set_mempolicy-a.patch + # Fix for CVE-2017-1000364 - note that this has been fixed differently in + # upstream (1be7107fbe18). The backport would be rather non-trivial so we + # kept with the original proposal patches.fixes/0001-mm-enlarge-stack-guard-gap.patch patches.fixes/0001-mm-enlarge-stack-guard-gap.patch-fix patches.fixes/0002-mm-do-not-collapse-stack-gap-into-THP.patch + patches.fixes/0002-mm-do-not-collapse-stack-gap-into-THP-fix.patch + patches.fixes/0001-mm-mmap-do-not-blow-on-PROT_NONE-MAP_FIXED-holes-in-.patch # Please put all VM/FS patches which are not tmpfs/shmem related # above |