kernel.git/arch/x86/mm, branch linux-3.17.y

x86, mm: Set NX across entire PMD at boot

2014-12-06T23:57:15Z

commit 45e2a9d4701d8c624d4a4bcdd1084eae31e92f58 upstream. When setting up permissions on kernel memory at boot, the end of the PMD that was split from bss remained executable. It should be NX like the rest. This performs a PMD alignment instead of a PAGE alignment to get the correct span of memory. Before: ---[ High Kernel Mapping ]--- ... 0xffffffff8202d000-0xffffffff82200000 1868K RW GLB NX pte 0xffffffff82200000-0xffffffff82c00000 10M RW PSE GLB NX pmd 0xffffffff82c00000-0xffffffff82df5000 2004K RW GLB NX pte 0xffffffff82df5000-0xffffffff82e00000 44K RW GLB x pte 0xffffffff82e00000-0xffffffffc0000000 978M pmd After: ---[ High Kernel Mapping ]--- ... 0xffffffff8202d000-0xffffffff82200000 1868K RW GLB NX pte 0xffffffff82200000-0xffffffff82e00000 12M RW PSE GLB NX pmd 0xffffffff82e00000-0xffffffffc0000000 978M pmd [ tglx: Changed it to roundup(_brk_end, PMD_SIZE) and added a comment. We really should unmap the reminder along with the holes caused by init,initdata etc. but thats a different issue ] Signed-off-by: Kees Cook Cc: Andy Lutomirski Cc: Toshi Kani Cc: Yasuaki Ishimatsu Cc: David Vrabel Cc: Wang Nan Cc: Yinghai Lu Link: http://lkml.kernel.org/r/20141114194737.GA3091@www.outflux.net Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman

x86, pageattr: Prevent overflow in slow_virt_to_phys() for X86_PAE

2014-11-14T18:10:23Z

commit d1cd1210834649ce1ca6bafe5ac25d2f40331343 upstream. pte_pfn() returns a PFN of long (32 bits in 32-PAE), so "long << PAGE_SHIFT" will overflow for PFNs above 4GB. Due to this issue, some Linux 32-PAE distros, running as guests on Hyper-V, with 5GB memory assigned, can't load the netvsc driver successfully and hence the synthetic network device can't work (we can use the kernel parameter mem=3000M to work around the issue). Cast pte_pfn() to phys_addr_t before shifting. Fixes: "commit d76565344512: x86, mm: Create slow_virt_to_phys()" Signed-off-by: Dexuan Cui Cc: K. Y. Srinivasan Cc: Haiyang Zhang Cc: gregkh@linuxfoundation.org Cc: linux-mm@kvack.org Cc: olaf@aepfle.de Cc: apw@canonical.com Cc: jasowang@redhat.com Cc: dave.hansen@intel.com Cc: riel@redhat.com Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1414580017-27444-1-git-send-email-decui@microsoft.com Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman

x86/mm: Apply the section attribute to the variable, not its type

2014-09-09T05:13:39Z

This fixes a compilation error in clang in that a linker section attribute can't be added to a type: arch/x86/mm/mmap.c:34:8: error: '__section__' attribute only applies to functions and global variables struct __read_mostly ... By moving the section attribute to the variable declaration, the desired effect is achieved. Signed-off-by: Jan-Simon Möller Signed-off-by: Behan Webster Cc: Linus Torvalds Cc: Andrew Morton Link: http://lkml.kernel.org/r/1409959005-11479-1-git-send-email-behanw@converseincode.com Signed-off-by: Ingo Molnar

x86-64, ptdump: Mark espfix area only if existent

2014-09-08T18:57:34Z

We should classify the espfix area as such only if we actually have enabled the corresponding option. Otherwise the page table dump might look confusing. Signed-off-by: Mathias Krause Link: http://lkml.kernel.org/r/1410114629-24523-1-git-send-email-minipli@googlemail.com Cc: Arjan van de Ven Cc: H. Peter Anvin Signed-off-by: H. Peter Anvin

Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/urgent

2014-08-22T08:04:15Z

Pull EFI fixes from Matt Fleming: * WARN_ON(!spin_is_locked()) always triggers on non-SMP machines. Swap it for the more canonical lockdep_assert_held() which always does the right thing - Guenter Roeck * Assign the correct value to efi.runtime_version on arm64 so that all the runtime services can be invoked - Semen Protsenko Signed-off-by: Ingo Molnar

x86/mm: Fix sparse 'tlb_single_page_flush_ceiling' warning and make the variable read-mostly

2014-08-10T07:07:18Z

A sparse warning is generated about 'tlb_single_page_flush_ceiling' not being declared. arch/x86/mm/tlb.c:177:15: warning: symbol 'tlb_single_page_flush_ceiling' was not declared. Should it be static? Since it isn't used anywhere outside this file, fix the warning by making it static. Also, optimize the use of this variable by adding the __read_mostly directive, as suggested by David Rientjes. Suggested-by: David Rientjes Signed-off-by: Jeremiah Mahler Cc: Dave Hansen Cc: Rik van Riel Cc: Mel Gorman Link: http://lkml.kernel.org/r/1407569913-4035-1-git-send-email-jmmahler@gmail.com Signed-off-by: Ingo Molnar

x86/mm: Fix RCU splat from new TLB tracepoints

2014-08-08T08:35:00Z

Dave Jones reported seeing a bug from one of my TLB tracepoints: http://lkml.kernel.org/r/20140806181801.GA4605@redhat.com According to Paul McKenney, the right way to fix this is adding an _rcuidle suffix to the tracepoint. http://lkml.kernel.org/r/20140807065055.GA5821@linux.vnet.ibm.com This patch does just that. Reported-by: Dave Jones , Signed-off-by: Dave Hansen Reviewed-by: Paul E. McKenney Cc: Dave Hansen Cc: Linus Torvalds Link: http://lkml.kernel.org/r/20140807175841.5C92D878@viggo.jf.intel.com Signed-off-by: Ingo Molnar

memory-hotplug: x86_32: suitable memory should go to ZONE_MOVABLE

2014-08-07T01:01:21Z

This patch introduces zone_for_memory() to arch_add_memory() on x86_32 to ensure new, higher memory added into ZONE_MOVABLE if movable zone has already setup. Signed-off-by: Wang Nan Cc: Zhang Yanfei Cc: Dave Hansen Cc: Ingo Molnar Cc: Yinghai Lu Cc: "Mel Gorman" Cc: Thomas Gleixner Cc: "H. Peter Anvin" Cc: "Luck, Tony" Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Chris Metcalf Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

memory-hotplug: x86_64: suitable memory should go to ZONE_MOVABLE

2014-08-07T01:01:21Z

This patch introduces zone_for_memory() to arch_add_memory() on x86_64 to ensure new, higher memory added into ZONE_MOVABLE if movable zone has already setup. Signed-off-by: Wang Nan Cc: Zhang Yanfei Cc: Dave Hansen Cc: Ingo Molnar Cc: Yinghai Lu Cc: "Mel Gorman" Cc: Thomas Gleixner Cc: "H. Peter Anvin" Cc: "Luck, Tony" Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Chris Metcalf Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: describe mmap_sem rules for __lock_page_or_retry() and callers

2014-08-07T01:01:20Z

Add a comment describing the circumstances in which __lock_page_or_retry() will or will not release the mmap_sem when returning 0. Add comments to lock_page_or_retry()'s callers (filemap_fault(), do_swap_page()) noting the impact on VM_FAULT_RETRY returns. Add comments on up the call tree, particularly replacing the false "We return with mmap_sem still held" comments. Signed-off-by: Paul Cassella Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds