diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0072-x86-retpoline-xen-Convert-Xen-hypercall-indirect-jum.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0072-x86-retpoline-xen-Convert-Xen-hypercall-indirect-jum.patch | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0072-x86-retpoline-xen-Convert-Xen-hypercall-indirect-jum.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0072-x86-retpoline-xen-Convert-Xen-hypercall-indirect-jum.patch new file mode 100644 index 00000000..a800dc71 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0072-x86-retpoline-xen-Convert-Xen-hypercall-indirect-jum.patch @@ -0,0 +1,64 @@ +From 88c3cee0956e7967097e40de0be79898d9faa7fe Mon Sep 17 00:00:00 2001 +From: David Woodhouse <dwmw@amazon.co.uk> +Date: Thu, 11 Jan 2018 21:46:31 +0000 +Subject: [PATCH 072/103] x86/retpoline/xen: Convert Xen hypercall indirect + jumps + +commit ea08816d5b185ab3d09e95e393f265af54560350 upstream. + +Convert indirect call in Xen hypercall to use non-speculative sequence, +when CONFIG_RETPOLINE is enabled. + +Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +Acked-by: Arjan van de Ven <arjan@linux.intel.com> +Acked-by: Ingo Molnar <mingo@kernel.org> +Reviewed-by: Juergen Gross <jgross@suse.com> +Cc: gnomes@lxorguk.ukuu.org.uk +Cc: Rik van Riel <riel@redhat.com> +Cc: Andi Kleen <ak@linux.intel.com> +Cc: Josh Poimboeuf <jpoimboe@redhat.com> +Cc: thomas.lendacky@amd.com +Cc: Peter Zijlstra <peterz@infradead.org> +Cc: Linus Torvalds <torvalds@linux-foundation.org> +Cc: Jiri Kosina <jikos@kernel.org> +Cc: Andy Lutomirski <luto@amacapital.net> +Cc: Dave Hansen <dave.hansen@intel.com> +Cc: Kees Cook <keescook@google.com> +Cc: Tim Chen <tim.c.chen@linux.intel.com> +Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org> +Cc: Paul Turner <pjt@google.com> +Link: https://lkml.kernel.org/r/1515707194-20531-10-git-send-email-dwmw@amazon.co.uk +Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + arch/x86/include/asm/xen/hypercall.h | 5 +++-- + 1 file changed, 3 insertions(+), 2 deletions(-) + +diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h +index a12a047..8b1f91f 100644 +--- a/arch/x86/include/asm/xen/hypercall.h ++++ b/arch/x86/include/asm/xen/hypercall.h +@@ -43,6 +43,7 @@ + + #include <asm/page.h> + #include <asm/pgtable.h> ++#include <asm/nospec-branch.h> + + #include <xen/interface/xen.h> + #include <xen/interface/sched.h> +@@ -214,9 +215,9 @@ privcmd_call(unsigned call, + __HYPERCALL_DECLS; + __HYPERCALL_5ARG(a1, a2, a3, a4, a5); + +- asm volatile("call *%[call]" ++ asm volatile(CALL_NOSPEC + : __HYPERCALL_5PARAM +- : [call] "a" (&hypercall_page[call]) ++ : [thunk_target] "a" (&hypercall_page[call]) + : __HYPERCALL_CLOBBER5); + + return (long)__res; +-- +2.7.4 + |