From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 28 Aug 2017 08:47:40 +0200 Subject: [PATCH] x86/asm: Replace access to desc_struct:a/b fields MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit CVE-2017-5754 The union inside of desc_struct which allows access to the raw u32 parts of the descriptors. This raw access part is about to go away. Replace the few code parts which access those fields. Signed-off-by: Thomas Gleixner Reviewed-by: Boris Ostrovsky Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Steven Rostedt Link: http://lkml.kernel.org/r/20170828064958.120214366@linutronix.de Signed-off-by: Ingo Molnar (cherry picked from commit 9a98e7780022aa7cd201eb8a88a4f1d607b73cde) Signed-off-by: Andy Whitcroft Signed-off-by: Kleber Sacilotto de Souza (cherry picked from commit 8469c76c61ea9c3b86b596352d1148bace5ea706) Signed-off-by: Fabian Grünbichler --- arch/x86/include/asm/xen/hypercall.h | 6 ++++-- arch/x86/kernel/tls.c | 2 +- arch/x86/xen/enlighten_pv.c | 2 +- 3 files changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h index 11071fcd630e..9606688caa4b 100644 --- a/arch/x86/include/asm/xen/hypercall.h +++ b/arch/x86/include/asm/xen/hypercall.h @@ -552,6 +552,8 @@ static inline void MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr, struct desc_struct desc) { + u32 *p = (u32 *) &desc; + mcl->op = __HYPERVISOR_update_descriptor; if (sizeof(maddr) == sizeof(long)) { mcl->args[0] = maddr; @@ -559,8 +561,8 @@ MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr, } else { mcl->args[0] = maddr; mcl->args[1] = maddr >> 32; - mcl->args[2] = desc.a; - mcl->args[3] = desc.b; + mcl->args[2] = *p++; + mcl->args[3] = *p; } trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4); diff --git a/arch/x86/kernel/tls.c b/arch/x86/kernel/tls.c index dcd699baea1b..a106b9719c58 100644 --- a/arch/x86/kernel/tls.c +++ b/arch/x86/kernel/tls.c @@ -93,7 +93,7 @@ static void set_tls_desc(struct task_struct *p, int idx, while (n-- > 0) { if (LDT_empty(info) || LDT_zero(info)) { - desc->a = desc->b = 0; + memset(desc, 0, sizeof(*desc)); } else { fill_ldt(desc, info); diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index 49ee3315b9f7..c76f5ff4d0d7 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -501,7 +501,7 @@ static void __init xen_load_gdt_boot(const struct desc_ptr *dtr) static inline bool desc_equal(const struct desc_struct *d1, const struct desc_struct *d2) { - return d1->a == d2->a && d1->b == d2->b; + return !memcmp(d1, d2, sizeof(*d1)); } static void load_TLS_descriptor(struct thread_struct *t, -- 2.14.2