Each processor holds a GDT in its per-cpu structure. The sgdt
instruction gives the base address of the current GDT. This address can
be used to bypass KASLR memory randomization. With another bug, an
attacker could target other per-cpu structures or deduce the base of
the main memory section (PAGE_OFFSET).
This patch relocates the GDT table for each processor inside the
Fixmap section. The space is reserved based on number of supported
processors.
For consistency, the remapping is done by default on 32 and 64 bit.
Each processor switches to its remapped GDT at the end of
initialization. For hibernation, the main processor returns with the
original GDT and switches back to the remapping at completion.
This patch was tested on both architectures. Hibernation and KVM were
both tested specially for their usage of the GDT.
Signed-off-by: Thomas Garnier <thgarnie@xxxxxxxxxx>
---
Based on next-20170125
---
arch/x86/entry/vdso/vma.c | 2 +-
arch/x86/include/asm/desc.h | 23 +++++++++++++++++++----
arch/x86/include/asm/fixmap.h | 4 ++++
arch/x86/include/asm/processor.h | 1 +
arch/x86/include/asm/stackprotector.h | 2 +-
arch/x86/kernel/acpi/sleep.c | 2 +-
arch/x86/kernel/apm_32.c | 6 +++---
arch/x86/kernel/cpu/common.c | 26 ++++++++++++++++++++++++--
arch/x86/kernel/setup_percpu.c | 2 +-
arch/x86/kernel/smpboot.c | 2 +-
arch/x86/platform/efi/efi_32.c | 4 ++--
arch/x86/power/cpu.c | 7 +++++--
arch/x86/xen/enlighten.c | 2 +-
arch/x86/xen/smp.c | 2 +-
drivers/lguest/x86/core.c | 6 +++---
drivers/pnp/pnpbios/bioscalls.c | 10 +++++-----
16 files changed, 73 insertions(+), 28 deletions(-)
diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index 10820f6cefbf..acae4ef04cdf 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -353,7 +353,7 @@ static void vgetcpu_cpu_init(void *arg)
d.p = 1; /* Present */
d.d = 1; /* 32-bit */
- write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_PER_CPU, &d, DESCTYPE_S);
+ write_gdt_entry(get_cpu_direct_gdt(cpu), GDT_ENTRY_PER_CPU, &d, DESCTYPE_S);
}
static int vgetcpu_online(unsigned int cpu)
diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
index 12080d87da3b..4cc176f57b78 100644
--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -4,6 +4,7 @@
#include <asm/desc_defs.h>
#include <asm/ldt.h>
#include <asm/mmu.h>
+#include <asm/fixmap.h>
#include <linux/smp.h>
#include <linux/percpu.h>
@@ -45,11 +46,25 @@ struct gdt_page {
DECLARE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page);
-static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
+/* Provide the original GDT */
+static inline struct desc_struct *get_cpu_direct_gdt(unsigned int cpu)
{
return per_cpu(gdt_page, cpu).gdt;
}
+/* Get the fixmap index for a specific processor */
+static inline unsigned int get_cpu_fixmap_gdt_index(int cpu)
+{
+ return FIX_GDT_REMAP_BEGIN + cpu;
+}
+
+/* Provide the fixmap address of the remapped GDT */
+static inline struct desc_struct *get_cpu_fixmap_gdt(int cpu)
+{
+ unsigned int idx = get_cpu_fixmap_gdt_index(cpu);
+ return (struct desc_struct *)__fix_to_virt(idx);
+}
+
#ifdef CONFIG_X86_64
static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func,
@@ -174,7 +189,7 @@ static inline void set_tssldt_descriptor(void *d, unsigned long addr, unsigned t
static inline void __set_tss_desc(unsigned cpu, unsigned int entry, void *addr)
{
- struct desc_struct *d = get_cpu_gdt_table(cpu);
+ struct desc_struct *d = get_cpu_direct_gdt(cpu);
tss_desc tss;
/*
@@ -202,7 +217,7 @@ static inline void native_set_ldt(const void *addr, unsigned int entries)
set_tssldt_descriptor(&ldt, (unsigned long)addr, DESC_LDT,
entries * LDT_ENTRY_SIZE - 1);
- write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT,
+ write_gdt_entry(get_cpu_direct_gdt(cpu), GDT_ENTRY_LDT,
&ldt, DESC_LDT);
asm volatile("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
}
@@ -244,7 +259,7 @@ static inline unsigned long native_store_tr(void)
static inline void native_load_tls(struct thread_struct *t, unsigned int cpu)
{
- struct desc_struct *gdt = get_cpu_gdt_table(cpu);
+ struct desc_struct *gdt = get_cpu_direct_gdt(cpu);
unsigned int i;
for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index c46289799b02..8b913b5e9383 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -100,6 +100,10 @@ enum fixed_addresses {
#ifdef CONFIG_X86_INTEL_MID
FIX_LNW_VRTC,
#endif
+ /* Fixmap entries to remap the GDTs, one per processor. */
+ FIX_GDT_REMAP_BEGIN,
+ FIX_GDT_REMAP_END = FIX_GDT_REMAP_BEGIN + NR_CPUS - 1,
+
__end_of_permanent_fixed_addresses,
/*
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 1be64da0384e..22801fd345dc 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -705,6 +705,7 @@ extern struct desc_ptr early_gdt_descr;
extern void cpu_set_gdt(int);
extern void switch_to_new_gdt(int);
+extern void load_fixmap_gdt(int);
extern void load_percpu_segment(int);
extern void cpu_init(void);
diff --git a/arch/x86/include/asm/stackprotector.h b/arch/x86/include/asm/stackprotector.h
index 58505f01962f..422426b8aba7 100644
--- a/arch/x86/include/asm/stackprotector.h
+++ b/arch/x86/include/asm/stackprotector.h
@@ -87,7 +87,7 @@ static inline void setup_stack_canary_segment(int cpu)
{
#ifdef CONFIG_X86_32
unsigned long canary = (unsigned long)&per_cpu(stack_canary, cpu);
- struct desc_struct *gdt_table = get_cpu_gdt_table(cpu);
+ struct desc_struct *gdt_table = get_cpu_direct_gdt(cpu);
struct desc_struct desc;
desc = gdt_table[GDT_ENTRY_STACK_CANARY];
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 48587335ede8..d13e6d156c22 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -101,7 +101,7 @@ int x86_acpi_suspend_lowlevel(void)
#ifdef CONFIG_SMP
initial_stack = (unsigned long)temp_stack + sizeof(temp_stack);
early_gdt_descr.address =
- (unsigned long)get_cpu_gdt_table(smp_processor_id());
+ (unsigned long)get_cpu_direct_gdt(smp_processor_id());
initial_gs = per_cpu_offset(smp_processor_id());
#endif
initial_code = (unsigned long)wakeup_long64;
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c
index 45d44c173cf9..458dbe18a860 100644
--- a/arch/x86/kernel/apm_32.c
+++ b/arch/x86/kernel/apm_32.c
@@ -608,7 +608,7 @@ static long __apm_bios_call(void *_call)
cpu = get_cpu();
BUG_ON(cpu != 0);
- gdt = get_cpu_gdt_table(cpu);
+ gdt = get_cpu_direct_gdt(cpu);
save_desc_40 = gdt[0x40 / 8];
gdt[0x40 / 8] = bad_bios_desc;
@@ -684,7 +684,7 @@ static long __apm_bios_call_simple(void *_call)
cpu = get_cpu();
BUG_ON(cpu != 0);
- gdt = get_cpu_gdt_table(cpu);
+ gdt = get_cpu_direct_gdt(cpu);
save_desc_40 = gdt[0x40 / 8];
gdt[0x40 / 8] = bad_bios_desc;
@@ -2351,7 +2351,7 @@ static int __init apm_init(void)
* Note we only set APM segments on CPU zero, since we pin the APM
* code to that CPU.
*/
- gdt = get_cpu_gdt_table(0);
+ gdt = get_cpu_direct_gdt(0);
set_desc_base(&gdt[APM_CS >> 3],
(unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
set_desc_base(&gdt[APM_CS_16 >> 3],
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 5ba74f280448..15f06cf3e3d4 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -444,6 +444,23 @@ void load_percpu_segment(int cpu)
load_stack_canary_segment();
}
+/* Setup the fixmap mapping only once per-processor */
+static inline void setup_fixmap_gdt(int cpu)
+{
+ __set_fixmap(get_cpu_fixmap_gdt_index(cpu),
+ __pa(get_cpu_direct_gdt(cpu)), PAGE_KERNEL);
+}
+
+/* Load a fixmap remapping of the per-cpu GDT */
+void load_fixmap_gdt(int cpu)
+{
+ struct desc_ptr gdt_descr;
+
+ gdt_descr.address = (long)get_cpu_fixmap_gdt(cpu);
+ gdt_descr.size = GDT_SIZE - 1;
+ load_gdt(&gdt_descr);
+}
+
/*
* Current gdt points %fs at the "master" per-cpu area: after this,
* it's on the real one.
@@ -452,11 +469,10 @@ void switch_to_new_gdt(int cpu)
{
struct desc_ptr gdt_descr;
- gdt_descr.address = (long)get_cpu_gdt_table(cpu);
+ gdt_descr.address = (long)get_cpu_direct_gdt(cpu);
gdt_descr.size = GDT_SIZE - 1;
load_gdt(&gdt_descr);
/* Reload the per-cpu base */
-
load_percpu_segment(cpu);
}
@@ -1511,6 +1527,9 @@ void cpu_init(void)
if (is_uv_system())
uv_cpu_init();
+
+ setup_fixmap_gdt(cpu);
+ load_fixmap_gdt(cpu);
}
#else
@@ -1566,6 +1585,9 @@ void cpu_init(void)
dbg_restore_debug_regs();
fpu__init_cpu();
+
+ setup_fixmap_gdt(cpu);
+ load_fixmap_gdt(cpu);
}
#endif
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 9820d6d977c6..e413c7607316 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -160,7 +160,7 @@ static inline void setup_percpu_segment(int cpu)
pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF,
0x2 | DESCTYPE_S, 0x8);
gdt.s = 1;
- write_gdt_entry(get_cpu_gdt_table(cpu),
+ write_gdt_entry(get_cpu_direct_gdt(cpu),
GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
#endif
}
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 46732dc3b73c..0b1096685cda 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -974,7 +974,7 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
unsigned long timeout;
idle->thread.sp = (unsigned long)task_pt_regs(idle);
- early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
+ early_gdt_descr.address = (unsigned long)get_cpu_direct_gdt(cpu);
initial_code = (unsigned long)start_secondary;
initial_stack = idle->thread.sp;
diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c
index cef39b097649..72d41dddbaf5 100644
--- a/arch/x86/platform/efi/efi_32.c
+++ b/arch/x86/platform/efi/efi_32.c
@@ -68,7 +68,7 @@ pgd_t * __init efi_call_phys_prolog(void)
load_cr3(initial_page_table);
__flush_tlb_all();
- gdt_descr.address = __pa(get_cpu_gdt_table(0));
+ gdt_descr.address = __pa(get_cpu_direct_gdt(0));
gdt_descr.size = GDT_SIZE - 1;
load_gdt(&gdt_descr);
@@ -79,7 +79,7 @@ void __init efi_call_phys_epilog(pgd_t *save_pgd)
{
struct desc_ptr gdt_descr;
- gdt_descr.address = (unsigned long)get_cpu_gdt_table(0);
+ gdt_descr.address = (unsigned long)get_cpu_direct_gdt(0);
gdt_descr.size = GDT_SIZE - 1;
load_gdt(&gdt_descr);
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index 66ade16c7693..644f80341f12 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -95,7 +95,7 @@ static void __save_processor_state(struct saved_context *ctxt)
* 'pmode_gdt' in wakeup_start.
*/
ctxt->gdt_desc.size = GDT_SIZE - 1;
- ctxt->gdt_desc.address = (unsigned long)get_cpu_gdt_table(smp_processor_id());
+ ctxt->gdt_desc.address = (unsigned long)get_cpu_direct_gdt(smp_processor_id());
store_tr(ctxt->tr);
@@ -162,7 +162,7 @@ static void fix_processor_context(void)
int cpu = smp_processor_id();
struct tss_struct *t = &per_cpu(cpu_tss, cpu);
#ifdef CONFIG_X86_64
- struct desc_struct *desc = get_cpu_gdt_table(cpu);
+ struct desc_struct *desc = get_cpu_direct_gdt(cpu);
tss_desc tss;
#endif
set_tss_desc(cpu, t); /*
@@ -183,6 +183,9 @@ static void fix_processor_context(void)
load_mm_ldt(current->active_mm); /* This does lldt */
fpu__resume_cpu();
+
+ /* The processor is back on the direct GDT, load back the fixmap */
+ load_fixmap_gdt(cpu);
}
/**
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 51ef95232725..b1a9baad2f0d 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -695,7 +695,7 @@ static void load_TLS_descriptor(struct thread_struct *t,
*shadow = t->tls_array[i];
- gdt = get_cpu_gdt_table(cpu);
+ gdt = get_cpu_direct_gdt(cpu);
maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
mc = __xen_mc_entry(0);
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 311acad7dad2..3de63fb4d833 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -401,7 +401,7 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
if (ctxt == NULL)
return -ENOMEM;
- gdt = get_cpu_gdt_table(cpu);
+ gdt = get_cpu_direct_gdt(cpu);
#ifdef CONFIG_X86_32
/* Note: PVH is not yet supported on x86_32. */
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
index d71f6323ac00..aa9d420913c5 100644
--- a/drivers/lguest/x86/core.c
+++ b/drivers/lguest/x86/core.c
@@ -504,7 +504,7 @@ void __init lguest_arch_host_init(void)
* byte, not the size, hence the "-1").
*/
state->host_gdt_desc.size = GDT_SIZE-1;
- state->host_gdt_desc.address = (long)get_cpu_gdt_table(i);
+ state->host_gdt_desc.address = (long)get_cpu_direct_gdt(i);
/*
* All CPUs on the Host use the same Interrupt Descriptor
@@ -554,8 +554,8 @@ void __init lguest_arch_host_init(void)
* The Host needs to be able to use the LGUEST segments on this
* CPU, too, so put them in the Host GDT.
*/
- get_cpu_gdt_table(i)[GDT_ENTRY_LGUEST_CS] = FULL_EXEC_SEGMENT;
- get_cpu_gdt_table(i)[GDT_ENTRY_LGUEST_DS] = FULL_SEGMENT;
+ get_cpu_direct_gdt(i)[GDT_ENTRY_LGUEST_CS] = FULL_EXEC_SEGMENT;
+ get_cpu_direct_gdt(i)[GDT_ENTRY_LGUEST_DS] = FULL_SEGMENT;
}
/*
diff --git a/drivers/pnp/pnpbios/bioscalls.c b/drivers/pnp/pnpbios/bioscalls.c
index 438d4c72c7b3..ce7288c5864c 100644
--- a/drivers/pnp/pnpbios/bioscalls.c
+++ b/drivers/pnp/pnpbios/bioscalls.c
@@ -54,7 +54,7 @@ __asm__(".text \n"
#define Q2_SET_SEL(cpu, selname, address, size) \
do { \
- struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
+ struct desc_struct *gdt = get_cpu_direct_gdt((cpu)); \
set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \
set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \
} while(0)
@@ -95,8 +95,8 @@ static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
return PNP_FUNCTION_NOT_SUPPORTED;
cpu = get_cpu();
- save_desc_40 = get_cpu_gdt_table(cpu)[0x40 / 8];
- get_cpu_gdt_table(cpu)[0x40 / 8] = bad_bios_desc;
+ save_desc_40 = get_cpu_direct_gdt(cpu)[0x40 / 8];
+ get_cpu_direct_gdt(cpu)[0x40 / 8] = bad_bios_desc;
/* On some boxes IRQ's during PnP BIOS calls are deadly. */
spin_lock_irqsave(&pnp_bios_lock, flags);
@@ -134,7 +134,7 @@ static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
:"memory");
spin_unlock_irqrestore(&pnp_bios_lock, flags);
- get_cpu_gdt_table(cpu)[0x40 / 8] = save_desc_40;
+ get_cpu_direct_gdt(cpu)[0x40 / 8] = save_desc_40;
put_cpu();
/* If we get here and this is set then the PnP BIOS faulted on us. */
@@ -477,7 +477,7 @@ void pnpbios_calls_init(union pnp_bios_install_struct *header)
pnp_bios_callpoint.segment = PNP_CS16;
for_each_possible_cpu(i) {
- struct desc_struct *gdt = get_cpu_gdt_table(i);
+ struct desc_struct *gdt = get_cpu_direct_gdt(i);
if (!gdt)
continue;
set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS32],
--
2.11.0.483.g087da7b7c-goog
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