From: Thomas Gleixner <tglx@linutronix.de> To: LKML <linux-kernel@vger.kernel.org> Cc: x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>, Andy Lutomirsky <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Dave Hansen <dave.hansen@intel.com>, Borislav Petkov <bpetkov@suse.de>, Greg KH <gregkh@linuxfoundation.org>, keescook@google.com, hughd@google.com, Brian Gerst <brgerst@gmail.com>, Josh Poimboeuf <jpoimboe@redhat.com>, Denys Vlasenko <dvlasenk@redhat.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Juergen Gross <jgross@suse.com>, David Laight <David.Laight@aculab.com>, Eduardo Valentin <eduval@amazon.com>, aliguori@amazon.com, Will Deacon <will.deacon@arm.com>, linux-mm@kvack.org Subject: [patch 10/16] x86/ldt: Do not install LDT for kernel threads Date: Tue, 12 Dec 2017 18:32:31 +0100 [thread overview] Message-ID: <20171212173334.097591438@linutronix.de> (raw) In-Reply-To: 20171212173221.496222173@linutronix.de [-- Attachment #1: x86-ldt--Do-not-install-LDT-for-kernel-threads.patch --] [-- Type: text/plain, Size: 747 bytes --] From: Thomas Gleixner <tglx@linutronix.de> Kernel threads can use the mm of a user process temporarily via use_mm(), but there is no point in installing the LDT which is associated to that mm for the kernel thread. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- arch/x86/include/asm/mmu_context.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/arch/x86/include/asm/mmu_context.h +++ b/arch/x86/include/asm/mmu_context.h @@ -95,8 +95,7 @@ static inline void load_mm_ldt(struct mm * the local LDT after an IPI loaded a newer value than the one * that we can see. */ - - if (unlikely(ldt)) + if (unlikely(ldt && !(current->flags & PF_KTHREAD)) set_ldt(ldt->entries, ldt->nr_entries); else clear_LDT();
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Gleixner <tglx@linutronix.de> To: LKML <linux-kernel@vger.kernel.org> Cc: x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>, Andy Lutomirsky <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Dave Hansen <dave.hansen@intel.com>, Borislav Petkov <bpetkov@suse.de>, Greg KH <gregkh@linuxfoundation.org>, keescook@google.com, hughd@google.com, Brian Gerst <brgerst@gmail.com>, Josh Poimboeuf <jpoimboe@redhat.com>, Denys Vlasenko <dvlasenk@redhat.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Juergen Gross <jgross@suse.com>, David Laight <David.Laight@aculab.com>, Eduardo Valentin <eduval@amazon.com>, aliguori@amazon.com, Will Deacon <will.deacon@arm.com>, linux-mm@kvack.org Subject: [patch 10/16] x86/ldt: Do not install LDT for kernel threads Date: Tue, 12 Dec 2017 18:32:31 +0100 [thread overview] Message-ID: <20171212173334.097591438@linutronix.de> (raw) In-Reply-To: 20171212173221.496222173@linutronix.de [-- Attachment #1: x86-ldt--Do-not-install-LDT-for-kernel-threads.patch --] [-- Type: text/plain, Size: 974 bytes --] From: Thomas Gleixner <tglx@linutronix.de> Kernel threads can use the mm of a user process temporarily via use_mm(), but there is no point in installing the LDT which is associated to that mm for the kernel thread. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- arch/x86/include/asm/mmu_context.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/arch/x86/include/asm/mmu_context.h +++ b/arch/x86/include/asm/mmu_context.h @@ -95,8 +95,7 @@ static inline void load_mm_ldt(struct mm * the local LDT after an IPI loaded a newer value than the one * that we can see. */ - - if (unlikely(ldt)) + if (unlikely(ldt && !(current->flags & PF_KTHREAD)) set_ldt(ldt->entries, ldt->nr_entries); else clear_LDT(); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2017-12-12 17:36 UTC|newest] Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-12-12 17:32 [patch 00/16] x86/ldt: Use a VMA based read only mapping Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 01/16] arch: Allow arch_dup_mmap() to fail Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 02/16] x86/ldt: Rework locking Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 03/16] x86/ldt: Prevent ldt inheritance on exec Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 04/16] mm/softdirty: Move VM_SOFTDIRTY into high bits Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 05/16] mm: Allow special mappings with user access cleared Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 18:00 ` Andy Lutomirski 2017-12-12 18:00 ` Andy Lutomirski 2017-12-12 18:05 ` Peter Zijlstra 2017-12-12 18:05 ` Peter Zijlstra 2017-12-12 18:06 ` Andy Lutomirski 2017-12-12 18:06 ` Andy Lutomirski 2017-12-12 18:25 ` Peter Zijlstra 2017-12-12 18:25 ` Peter Zijlstra 2017-12-13 12:22 ` Peter Zijlstra 2017-12-13 12:22 ` Peter Zijlstra 2017-12-13 12:57 ` Kirill A. Shutemov 2017-12-13 12:57 ` Kirill A. Shutemov 2017-12-13 14:34 ` Peter Zijlstra 2017-12-13 14:34 ` Peter Zijlstra 2017-12-13 14:43 ` Kirill A. Shutemov 2017-12-13 14:43 ` Kirill A. Shutemov 2017-12-13 15:00 ` Peter Zijlstra 2017-12-13 15:00 ` Peter Zijlstra 2017-12-13 15:04 ` Peter Zijlstra 2017-12-13 15:04 ` Peter Zijlstra 2017-12-13 15:14 ` Dave Hansen 2017-12-13 15:14 ` Dave Hansen 2017-12-13 15:32 ` Peter Zijlstra 2017-12-13 15:32 ` Peter Zijlstra 2017-12-13 15:47 ` Dave Hansen 2017-12-13 15:47 ` Dave Hansen 2017-12-13 15:54 ` Peter Zijlstra 2017-12-13 15:54 ` Peter Zijlstra 2017-12-13 18:08 ` Linus Torvalds 2017-12-13 18:08 ` Linus Torvalds 2017-12-13 18:21 ` Dave Hansen 2017-12-13 18:21 ` Dave Hansen 2017-12-13 18:23 ` Linus Torvalds 2017-12-13 18:23 ` Linus Torvalds 2017-12-13 18:31 ` Andy Lutomirski 2017-12-13 18:31 ` Andy Lutomirski 2017-12-13 18:32 ` Peter Zijlstra 2017-12-13 18:32 ` Peter Zijlstra 2017-12-13 18:35 ` Linus Torvalds 2017-12-13 18:35 ` Linus Torvalds 2017-12-14 4:53 ` Aneesh Kumar K.V 2017-12-14 4:53 ` Aneesh Kumar K.V 2017-12-13 21:50 ` Matthew Wilcox 2017-12-13 21:50 ` Matthew Wilcox 2017-12-13 22:12 ` Peter Zijlstra 2017-12-13 22:12 ` Peter Zijlstra 2017-12-14 0:10 ` Matthew Wilcox 2017-12-14 0:10 ` Matthew Wilcox 2017-12-14 0:16 ` Andy Lutomirski 2017-12-14 0:16 ` Andy Lutomirski 2017-12-12 17:32 ` [patch 06/16] mm: Provide vm_special_mapping::close Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 07/16] selftest/x86: Implement additional LDT selftests Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 08/16] selftests/x86/ldt_gdt: Prepare for access bit forced Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 09/16] mm: Make populate_vma_page_range() available Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner [this message] 2017-12-12 17:32 ` [patch 10/16] x86/ldt: Do not install LDT for kernel threads Thomas Gleixner 2017-12-12 17:57 ` Andy Lutomirski 2017-12-12 17:57 ` Andy Lutomirski 2017-12-12 17:32 ` [patch 11/16] x86/ldt: Force access bit for CS/SS Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 18:03 ` Andy Lutomirski 2017-12-12 18:03 ` Andy Lutomirski 2017-12-12 18:09 ` Peter Zijlstra 2017-12-12 18:09 ` Peter Zijlstra 2017-12-12 18:10 ` Andy Lutomirski 2017-12-12 18:10 ` Andy Lutomirski 2017-12-12 18:22 ` Andy Lutomirski 2017-12-12 18:22 ` Andy Lutomirski 2017-12-12 18:29 ` Peter Zijlstra 2017-12-12 18:29 ` Peter Zijlstra 2017-12-12 18:41 ` Thomas Gleixner 2017-12-12 18:41 ` Thomas Gleixner 2017-12-12 19:04 ` Peter Zijlstra 2017-12-12 19:04 ` Peter Zijlstra 2017-12-12 19:05 ` Linus Torvalds 2017-12-12 19:05 ` Linus Torvalds 2017-12-12 19:26 ` Andy Lutomirski 2017-12-12 19:26 ` Andy Lutomirski 2017-12-19 12:10 ` David Laight 2017-12-19 12:10 ` David Laight 2017-12-12 17:32 ` [patch 12/16] x86/ldt: Reshuffle code Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 13/16] x86/ldt: Introduce LDT write fault handler Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:58 ` Andy Lutomirski 2017-12-12 17:58 ` Andy Lutomirski 2017-12-12 18:19 ` Peter Zijlstra 2017-12-12 18:19 ` Peter Zijlstra 2017-12-12 18:43 ` Thomas Gleixner 2017-12-12 18:43 ` Thomas Gleixner 2017-12-12 19:01 ` Linus Torvalds 2017-12-12 19:01 ` Linus Torvalds 2017-12-12 19:21 ` Thomas Gleixner 2017-12-12 19:21 ` Thomas Gleixner 2017-12-12 19:51 ` Linus Torvalds 2017-12-12 19:51 ` Linus Torvalds 2017-12-12 20:21 ` Dave Hansen 2017-12-12 20:21 ` Dave Hansen 2017-12-12 20:37 ` Thomas Gleixner 2017-12-12 20:37 ` Thomas Gleixner 2017-12-12 21:35 ` Andy Lutomirski 2017-12-12 21:35 ` Andy Lutomirski 2017-12-12 21:42 ` Thomas Gleixner 2017-12-12 21:42 ` Thomas Gleixner 2017-12-12 21:41 ` Thomas Gleixner 2017-12-12 21:41 ` Thomas Gleixner 2017-12-12 21:46 ` Thomas Gleixner 2017-12-12 21:46 ` Thomas Gleixner 2017-12-12 22:25 ` Peter Zijlstra 2017-12-12 22:25 ` Peter Zijlstra 2017-12-12 17:32 ` [patch 14/16] x86/ldt: Prepare for VMA mapping Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 15/16] x86/ldt: Add VMA management code Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 17:32 ` [patch 16/16] x86/ldt: Make it read only VMA mapped Thomas Gleixner 2017-12-12 17:32 ` Thomas Gleixner 2017-12-12 18:03 ` [patch 00/16] x86/ldt: Use a VMA based read only mapping Andy Lutomirski 2017-12-12 18:03 ` Andy Lutomirski
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