[PATCH] i386/x86-64: Fix x87 information leak between processes
AMD K7/K8 CPUs only save/restore the FOP/FIP/FDP x87 registers in FXSAVE when an exception is pending. This means the value leak through context switches and allow processes to observe some x87 instruction state of other processes. This was actually documented by AMD, but nobody recognized it as being different from Intel before. The fix first adds an optimization: instead of unconditionally calling FNCLEX after each FXSAVE test if ES is pending and skip it when not needed. Then do a x87 load from a kernel variable to clear FOP/FIP/FDP. This means other processes always will only see a constant value defined by the kernel in their FP state. I took some pain to make sure to chose a variable that's already in L1 during context switch to make the overhead of this low. Also alternative() is used to patch away the new code on CPUs who don't need it. Patch for both i386/x86-64. The problem was discovered originally by Jan Beulich. Richard Brunner provided the basic code for the workarounds, with contribution from Jan. This is CVE-2006-1056 Cc: richard.brunner@amd.com Cc: jbeulich@novell.com Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
parent
5dc5cf7dd2
commit
18bd057b14
|
@ -207,6 +207,8 @@ static void __init init_amd(struct cpuinfo_x86 *c)
|
||||||
set_bit(X86_FEATURE_K7, c->x86_capability);
|
set_bit(X86_FEATURE_K7, c->x86_capability);
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
|
if (c->x86 >= 6)
|
||||||
|
set_bit(X86_FEATURE_FXSAVE_LEAK, c->x86_capability);
|
||||||
|
|
||||||
display_cacheinfo(c);
|
display_cacheinfo(c);
|
||||||
|
|
||||||
|
|
|
@ -575,8 +575,10 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
|
||||||
prev->userrsp = read_pda(oldrsp);
|
prev->userrsp = read_pda(oldrsp);
|
||||||
write_pda(oldrsp, next->userrsp);
|
write_pda(oldrsp, next->userrsp);
|
||||||
write_pda(pcurrent, next_p);
|
write_pda(pcurrent, next_p);
|
||||||
|
|
||||||
/* This must be here to ensure both math_state_restore() and
|
/* This must be here to ensure both math_state_restore() and
|
||||||
kernel_fpu_begin() work consistently. */
|
kernel_fpu_begin() work consistently.
|
||||||
|
And the AMD workaround requires it to be after DS reload. */
|
||||||
unlazy_fpu(prev_p);
|
unlazy_fpu(prev_p);
|
||||||
write_pda(kernelstack,
|
write_pda(kernelstack,
|
||||||
task_stack_page(next_p) + THREAD_SIZE - PDA_STACKOFFSET);
|
task_stack_page(next_p) + THREAD_SIZE - PDA_STACKOFFSET);
|
||||||
|
|
|
@ -930,6 +930,10 @@ static int __init init_amd(struct cpuinfo_x86 *c)
|
||||||
if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58))
|
if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58))
|
||||||
set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);
|
set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);
|
||||||
|
|
||||||
|
/* Enable workaround for FXSAVE leak */
|
||||||
|
if (c->x86 >= 6)
|
||||||
|
set_bit(X86_FEATURE_FXSAVE_LEAK, &c->x86_capability);
|
||||||
|
|
||||||
r = get_model_name(c);
|
r = get_model_name(c);
|
||||||
if (!r) {
|
if (!r) {
|
||||||
switch (c->x86) {
|
switch (c->x86) {
|
||||||
|
|
|
@ -71,6 +71,7 @@
|
||||||
#define X86_FEATURE_P4 (3*32+ 7) /* P4 */
|
#define X86_FEATURE_P4 (3*32+ 7) /* P4 */
|
||||||
#define X86_FEATURE_CONSTANT_TSC (3*32+ 8) /* TSC ticks at a constant rate */
|
#define X86_FEATURE_CONSTANT_TSC (3*32+ 8) /* TSC ticks at a constant rate */
|
||||||
#define X86_FEATURE_UP (3*32+ 9) /* smp kernel running on up */
|
#define X86_FEATURE_UP (3*32+ 9) /* smp kernel running on up */
|
||||||
|
#define X86_FEATURE_FXSAVE_LEAK (3*32+10) /* FXSAVE leaks FOP/FIP/FOP */
|
||||||
|
|
||||||
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
|
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
|
||||||
#define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */
|
#define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */
|
||||||
|
|
|
@ -13,6 +13,7 @@
|
||||||
|
|
||||||
#include <linux/sched.h>
|
#include <linux/sched.h>
|
||||||
#include <linux/init.h>
|
#include <linux/init.h>
|
||||||
|
#include <linux/kernel_stat.h>
|
||||||
#include <asm/processor.h>
|
#include <asm/processor.h>
|
||||||
#include <asm/sigcontext.h>
|
#include <asm/sigcontext.h>
|
||||||
#include <asm/user.h>
|
#include <asm/user.h>
|
||||||
|
@ -38,17 +39,38 @@ extern void init_fpu(struct task_struct *);
|
||||||
extern void kernel_fpu_begin(void);
|
extern void kernel_fpu_begin(void);
|
||||||
#define kernel_fpu_end() do { stts(); preempt_enable(); } while(0)
|
#define kernel_fpu_end() do { stts(); preempt_enable(); } while(0)
|
||||||
|
|
||||||
|
/* We need a safe address that is cheap to find and that is already
|
||||||
|
in L1 during context switch. The best choices are unfortunately
|
||||||
|
different for UP and SMP */
|
||||||
|
#ifdef CONFIG_SMP
|
||||||
|
#define safe_address (__per_cpu_offset[0])
|
||||||
|
#else
|
||||||
|
#define safe_address (kstat_cpu(0).cpustat.user)
|
||||||
|
#endif
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* These must be called with preempt disabled
|
* These must be called with preempt disabled
|
||||||
*/
|
*/
|
||||||
static inline void __save_init_fpu( struct task_struct *tsk )
|
static inline void __save_init_fpu( struct task_struct *tsk )
|
||||||
{
|
{
|
||||||
|
/* Use more nops than strictly needed in case the compiler
|
||||||
|
varies code */
|
||||||
alternative_input(
|
alternative_input(
|
||||||
"fnsave %1 ; fwait ;" GENERIC_NOP2,
|
"fnsave %[fx] ;fwait;" GENERIC_NOP8 GENERIC_NOP4,
|
||||||
"fxsave %1 ; fnclex",
|
"fxsave %[fx]\n"
|
||||||
|
"bt $7,%[fsw] ; jc 1f ; fnclex\n1:",
|
||||||
X86_FEATURE_FXSR,
|
X86_FEATURE_FXSR,
|
||||||
"m" (tsk->thread.i387.fxsave)
|
[fx] "m" (tsk->thread.i387.fxsave),
|
||||||
:"memory");
|
[fsw] "m" (tsk->thread.i387.fxsave.swd) : "memory");
|
||||||
|
/* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception
|
||||||
|
is pending. Clear the x87 state here by setting it to fixed
|
||||||
|
values. __per_cpu_offset[0] is a random variable that should be in L1 */
|
||||||
|
alternative_input(
|
||||||
|
GENERIC_NOP8 GENERIC_NOP2,
|
||||||
|
"emms\n\t" /* clear stack tags */
|
||||||
|
"fildl %[addr]", /* set F?P to defined value */
|
||||||
|
X86_FEATURE_FXSAVE_LEAK,
|
||||||
|
[addr] "m" (safe_address));
|
||||||
task_thread_info(tsk)->status &= ~TS_USEDFPU;
|
task_thread_info(tsk)->status &= ~TS_USEDFPU;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
|
@ -64,6 +64,7 @@
|
||||||
#define X86_FEATURE_REP_GOOD (3*32+ 4) /* rep microcode works well on this CPU */
|
#define X86_FEATURE_REP_GOOD (3*32+ 4) /* rep microcode works well on this CPU */
|
||||||
#define X86_FEATURE_CONSTANT_TSC (3*32+5) /* TSC runs at constant rate */
|
#define X86_FEATURE_CONSTANT_TSC (3*32+5) /* TSC runs at constant rate */
|
||||||
#define X86_FEATURE_SYNC_RDTSC (3*32+6) /* RDTSC syncs CPU core */
|
#define X86_FEATURE_SYNC_RDTSC (3*32+6) /* RDTSC syncs CPU core */
|
||||||
|
#define X86_FEATURE_FXSAVE_LEAK (3*32+7) /* FIP/FOP/FDP leaks through FXSAVE */
|
||||||
|
|
||||||
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
|
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
|
||||||
#define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */
|
#define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */
|
||||||
|
|
|
@ -72,6 +72,23 @@ extern int set_fpregs(struct task_struct *tsk,
|
||||||
#define set_fpu_swd(t,val) ((t)->thread.i387.fxsave.swd = (val))
|
#define set_fpu_swd(t,val) ((t)->thread.i387.fxsave.swd = (val))
|
||||||
#define set_fpu_fxsr_twd(t,val) ((t)->thread.i387.fxsave.twd = (val))
|
#define set_fpu_fxsr_twd(t,val) ((t)->thread.i387.fxsave.twd = (val))
|
||||||
|
|
||||||
|
#define X87_FSW_ES (1 << 7) /* Exception Summary */
|
||||||
|
|
||||||
|
/* AMD CPUs don't save/restore FDP/FIP/FOP unless an exception
|
||||||
|
is pending. Clear the x87 state here by setting it to fixed
|
||||||
|
values. The kernel data segment can be sometimes 0 and sometimes
|
||||||
|
new user value. Both should be ok.
|
||||||
|
Use the PDA as safe address because it should be already in L1. */
|
||||||
|
static inline void clear_fpu_state(struct i387_fxsave_struct *fx)
|
||||||
|
{
|
||||||
|
if (unlikely(fx->swd & X87_FSW_ES))
|
||||||
|
asm volatile("fnclex");
|
||||||
|
alternative_input(ASM_NOP8 ASM_NOP2,
|
||||||
|
" emms\n" /* clear stack tags */
|
||||||
|
" fildl %%gs:0", /* load to clear state */
|
||||||
|
X86_FEATURE_FXSAVE_LEAK);
|
||||||
|
}
|
||||||
|
|
||||||
static inline int restore_fpu_checking(struct i387_fxsave_struct *fx)
|
static inline int restore_fpu_checking(struct i387_fxsave_struct *fx)
|
||||||
{
|
{
|
||||||
int err;
|
int err;
|
||||||
|
@ -119,6 +136,7 @@ static inline int save_i387_checking(struct i387_fxsave_struct __user *fx)
|
||||||
#endif
|
#endif
|
||||||
if (unlikely(err))
|
if (unlikely(err))
|
||||||
__clear_user(fx, sizeof(struct i387_fxsave_struct));
|
__clear_user(fx, sizeof(struct i387_fxsave_struct));
|
||||||
|
/* No need to clear here because the caller clears USED_MATH */
|
||||||
return err;
|
return err;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -149,7 +167,7 @@ static inline void __fxsave_clear(struct task_struct *tsk)
|
||||||
"i" (offsetof(__typeof__(*tsk),
|
"i" (offsetof(__typeof__(*tsk),
|
||||||
thread.i387.fxsave)));
|
thread.i387.fxsave)));
|
||||||
#endif
|
#endif
|
||||||
__asm__ __volatile__("fnclex");
|
clear_fpu_state(&tsk->thread.i387.fxsave);
|
||||||
}
|
}
|
||||||
|
|
||||||
static inline void kernel_fpu_begin(void)
|
static inline void kernel_fpu_begin(void)
|
||||||
|
|
Loading…
Reference in a new issue