diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-entry-64-compat-Clear-registers-for-compat-sysca.patch')
-rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-entry-64-compat-Clear-registers-for-compat-sysca.patch | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-entry-64-compat-Clear-registers-for-compat-sysca.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-entry-64-compat-Clear-registers-for-compat-sysca.patch deleted file mode 100644 index 1006a947..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-entry-64-compat-Clear-registers-for-compat-sysca.patch +++ /dev/null @@ -1,117 +0,0 @@ -From 5b4a083e3f13f1bbea53075da6dc33b1e9dc3b62 Mon Sep 17 00:00:00 2001 -From: Dan Williams <dan.j.williams@intel.com> -Date: Mon, 5 Feb 2018 17:18:17 -0800 -Subject: [PATCH 02/12] x86/entry/64/compat: Clear registers for compat - syscalls, to reduce speculation attack surface - -commit 6b8cf5cc9965673951f1ab3f0e3cf23d06e3e2ee upstream. - -At entry userspace may have populated registers with values that could -otherwise be useful in a speculative execution attack. Clear them to -minimize the kernel's attack surface. - -Originally-From: Andi Kleen <ak@linux.intel.com> -Signed-off-by: Dan Williams <dan.j.williams@intel.com> -Cc: <stable@vger.kernel.org> -Cc: Andy Lutomirski <luto@kernel.org> -Cc: Borislav Petkov <bp@alien8.de> -Cc: Brian Gerst <brgerst@gmail.com> -Cc: Denys Vlasenko <dvlasenk@redhat.com> -Cc: H. Peter Anvin <hpa@zytor.com> -Cc: Josh Poimboeuf <jpoimboe@redhat.com> -Cc: Linus Torvalds <torvalds@linux-foundation.org> -Cc: Peter Zijlstra <peterz@infradead.org> -Cc: Thomas Gleixner <tglx@linutronix.de> -Link: http://lkml.kernel.org/r/151787989697.7847.4083702787288600552.stgit@dwillia2-desk3.amr.corp.intel.com -[ Made small improvements to the changelog. ] -Signed-off-by: Ingo Molnar <mingo@kernel.org> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/x86/entry/entry_64_compat.S | 30 ++++++++++++++++++++++++++++++ - 1 file changed, 30 insertions(+) - -diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S -index d76a976..92c5573 100644 ---- a/arch/x86/entry/entry_64_compat.S -+++ b/arch/x86/entry/entry_64_compat.S -@@ -83,15 +83,25 @@ ENTRY(entry_SYSENTER_compat) - pushq %rcx /* pt_regs->cx */ - pushq $-ENOSYS /* pt_regs->ax */ - pushq $0 /* pt_regs->r8 = 0 */ -+ xorq %r8, %r8 /* nospec r8 */ - pushq $0 /* pt_regs->r9 = 0 */ -+ xorq %r9, %r9 /* nospec r9 */ - pushq $0 /* pt_regs->r10 = 0 */ -+ xorq %r10, %r10 /* nospec r10 */ - pushq $0 /* pt_regs->r11 = 0 */ -+ xorq %r11, %r11 /* nospec r11 */ - pushq %rbx /* pt_regs->rbx */ -+ xorl %ebx, %ebx /* nospec rbx */ - pushq %rbp /* pt_regs->rbp (will be overwritten) */ -+ xorl %ebp, %ebp /* nospec rbp */ - pushq $0 /* pt_regs->r12 = 0 */ -+ xorq %r12, %r12 /* nospec r12 */ - pushq $0 /* pt_regs->r13 = 0 */ -+ xorq %r13, %r13 /* nospec r13 */ - pushq $0 /* pt_regs->r14 = 0 */ -+ xorq %r14, %r14 /* nospec r14 */ - pushq $0 /* pt_regs->r15 = 0 */ -+ xorq %r15, %r15 /* nospec r15 */ - cld - - /* -@@ -209,15 +219,25 @@ ENTRY(entry_SYSCALL_compat) - pushq %rbp /* pt_regs->cx (stashed in bp) */ - pushq $-ENOSYS /* pt_regs->ax */ - pushq $0 /* pt_regs->r8 = 0 */ -+ xorq %r8, %r8 /* nospec r8 */ - pushq $0 /* pt_regs->r9 = 0 */ -+ xorq %r9, %r9 /* nospec r9 */ - pushq $0 /* pt_regs->r10 = 0 */ -+ xorq %r10, %r10 /* nospec r10 */ - pushq $0 /* pt_regs->r11 = 0 */ -+ xorq %r11, %r11 /* nospec r11 */ - pushq %rbx /* pt_regs->rbx */ -+ xorl %ebx, %ebx /* nospec rbx */ - pushq %rbp /* pt_regs->rbp (will be overwritten) */ -+ xorl %ebp, %ebp /* nospec rbp */ - pushq $0 /* pt_regs->r12 = 0 */ -+ xorq %r12, %r12 /* nospec r12 */ - pushq $0 /* pt_regs->r13 = 0 */ -+ xorq %r13, %r13 /* nospec r13 */ - pushq $0 /* pt_regs->r14 = 0 */ -+ xorq %r14, %r14 /* nospec r14 */ - pushq $0 /* pt_regs->r15 = 0 */ -+ xorq %r15, %r15 /* nospec r15 */ - - /* - * User mode is traced as though IRQs are on, and SYSENTER -@@ -320,15 +340,25 @@ ENTRY(entry_INT80_compat) - pushq %rcx /* pt_regs->cx */ - pushq $-ENOSYS /* pt_regs->ax */ - pushq $0 /* pt_regs->r8 = 0 */ -+ xorq %r8, %r8 /* nospec r8 */ - pushq $0 /* pt_regs->r9 = 0 */ -+ xorq %r9, %r9 /* nospec r9 */ - pushq $0 /* pt_regs->r10 = 0 */ -+ xorq %r10, %r10 /* nospec r10 */ - pushq $0 /* pt_regs->r11 = 0 */ -+ xorq %r11, %r11 /* nospec r11 */ - pushq %rbx /* pt_regs->rbx */ -+ xorl %ebx, %ebx /* nospec rbx */ - pushq %rbp /* pt_regs->rbp */ -+ xorl %ebp, %ebp /* nospec rbp */ - pushq %r12 /* pt_regs->r12 */ -+ xorq %r12, %r12 /* nospec r12 */ - pushq %r13 /* pt_regs->r13 */ -+ xorq %r13, %r13 /* nospec r13 */ - pushq %r14 /* pt_regs->r14 */ -+ xorq %r14, %r14 /* nospec r14 */ - pushq %r15 /* pt_regs->r15 */ -+ xorq %r15, %r15 /* nospec r15 */ - cld - - /* --- -2.7.4 - |