Linux v4.1-rc8
This commit is contained in:
Josh Boyer
parent
c68e8929a1
commit
5c0a6a5f01
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@ -43,7 +43,7 @@ Signed-off-by: Josh Stone <jistone@redhat.com>
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2 files changed, 21 insertions(+), 1 deletion(-)
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diff --git a/Makefile b/Makefile
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index 40a8b068ac26..6f53fdb40695 100644
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index 3ba504496cb2..43361e22734a 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -704,7 +704,11 @@ KBUILD_CFLAGS += -fomit-frame-pointer
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@ -15,10 +15,10 @@ Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org>
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2 files changed, 2 insertions(+), 2 deletions(-)
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diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
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index 61ab1628a057..8a62b65a7597 100644
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index 6726139bd289..a5e55141ae64 100644
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--- a/Documentation/kernel-parameters.txt
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+++ b/Documentation/kernel-parameters.txt
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@@ -3865,7 +3865,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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@@ -3871,7 +3871,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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the allocated input device; If set to 0, video driver
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will only send out the event without touching backlight
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brightness level.
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11
kernel.spec
11
kernel.spec
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@ -65,9 +65,9 @@ Summary: The Linux kernel
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# The next upstream release sublevel (base_sublevel+1)
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%define upstream_sublevel %(echo $((%{base_sublevel} + 1)))
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# The rc snapshot level
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%define rcrev 7
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%define rcrev 8
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# The git snapshot level
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%define gitrev 1
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%define gitrev 0
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# Set rpm version accordingly
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%define rpmversion 4.%{upstream_sublevel}.0
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%endif
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@ -618,6 +618,8 @@ Patch26221: drm-i915-turn-off-wc-mmaps.patch
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# CVE-2015-XXXX rhbz 1230770 1230774
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Patch26231: kvm-x86-fix-kvm_apic_has_events-to-check-for-NULL-po.patch
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Patch26232: mm-shmem_zero_setup-skip-security-check-and-lockdep-.patch
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# END OF PATCH DEFINITIONS
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%endif
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@ -1354,6 +1356,8 @@ ApplyPatch drm-i915-turn-off-wc-mmaps.patch
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# CVE-2015-XXXX rhbz 1230770 1230774
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ApplyPatch kvm-x86-fix-kvm_apic_has_events-to-check-for-NULL-po.patch
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ApplyPatch mm-shmem_zero_setup-skip-security-check-and-lockdep-.patch
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# END OF PATCH APPLICATIONS
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%endif
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@ -2218,6 +2222,9 @@ fi
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#
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#
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%changelog
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* Mon Jun 15 2015 Josh Boyer <jwboyer@fedoraproject.org> - 4.1.0-0.rc8.git0.1
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- Linux v4.1-rc8
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* Fri Jun 12 2015 Josh Boyer <jwboyer@fedoraproject.org> - 4.1.0-0.rc7.git1.1
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- Linux v4.1-rc7-72-gdf5f4158415b
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@ -0,0 +1,47 @@
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From: Hugh Dickins <hughd@google.com>
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Date: Sun, 14 Jun 2015 09:48:09 -0700
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Subject: [PATCH] mm: shmem_zero_setup skip security check and lockdep conflict
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with XFS
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It appears that, at some point last year, XFS made directory handling
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changes which bring it into lockdep conflict with shmem_zero_setup():
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it is surprising that mmap() can clone an inode while holding mmap_sem,
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but that has been so for many years.
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Since those few lockdep traces that I've seen all implicated selinux,
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I'm hoping that we can use the __shmem_file_setup(,,,S_PRIVATE) which
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v3.13's commit c7277090927a ("security: shmem: implement kernel private
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shmem inodes") introduced to avoid LSM checks on kernel-internal inodes:
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the mmap("/dev/zero") cloned inode is indeed a kernel-internal detail.
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This also covers the !CONFIG_SHMEM use of ramfs to support /dev/zero
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(and MAP_SHARED|MAP_ANONYMOUS). I thought there were also drivers
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which cloned inode in mmap(), but if so, I cannot locate them now.
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Reported-and-tested-by: Prarit Bhargava <prarit@redhat.com>
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Reported-by: Daniel Wagner <wagi@monom.org>
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Reported-by: Morten Stevens <mstevens@fedoraproject.org>
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Signed-off-by: Hugh Dickins <hughd@google.com>
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---
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mm/shmem.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/mm/shmem.c b/mm/shmem.c
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index de981370fbc5..47d536e59fc0 100644
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--- a/mm/shmem.c
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+++ b/mm/shmem.c
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@@ -3401,7 +3401,13 @@ int shmem_zero_setup(struct vm_area_struct *vma)
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struct file *file;
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loff_t size = vma->vm_end - vma->vm_start;
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- file = shmem_file_setup("dev/zero", size, vma->vm_flags);
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+ /*
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+ * Cloning a new file under mmap_sem leads to a lock ordering conflict
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+ * between XFS directory reading and selinux: since this file is only
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+ * accessible to the user through its mapping, use S_PRIVATE flag to
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+ * bypass file security, in the same way as shmem_kernel_file_setup().
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+ */
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+ file = __shmem_file_setup("dev/zero", size, vma->vm_flags, S_PRIVATE);
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if (IS_ERR(file))
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return PTR_ERR(file);
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