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Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 

Pull ARM updates from Russell King:
 "The main item in this pull request are the Spectre variant 1.1 fixes
  from Julien Thierry.

  A few other patches to improve various areas, and removal of some
  obsolete mcount bits and a redundant kbuild conditional"

* 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 8802/1: Call syscall_trace_exit even when system call skipped
  ARM: 8797/1: spectre-v1.1: harden __copy_to_user
  ARM: 8796/1: spectre-v1,v1.1: provide helpers for address sanitization
  ARM: 8795/1: spectre-v1.1: use put_user() for __put_user()
  ARM: 8794/1: uaccess: Prevent speculative use of the current addr_limit
  ARM: 8793/1: signal: replace __put_user_error with __put_user
  ARM: 8792/1: oabi-compat: copy oabi events using __copy_to_user()
  ARM: 8791/1: vfp: use __copy_to_user() when saving VFP state
  ARM: 8790/1: signal: always use __copy_to_user to save iwmmxt context
  ARM: 8789/1: signal: copy registers using __copy_to_user()
  ARM: 8801/1: makefile: use ARMv3M mode for RiscPC
  ARM: 8800/1: use choice for kernel unwinders
  ARM: 8798/1: remove unnecessary KBUILD_SRC ifeq conditional
  ARM: 8788/1: ftrace: remove old mcount support
  ARM: 8786/1: Debug kernel copy by printing
This commit is contained in:
Linus Torvalds 2018-10-23 19:32:10 +01:00
parent 034bda1cd5 3e98d24098
commit 07171da264
18 changed files with 202 additions and 224 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
arch/arm/Kconfig.debug
View File

@ -45,35 +45,42 @@ config DEBUG_WX
If in doubt, say "Y".
# RMK wants arm kernels compiled with frame pointers or stack unwinding.
# If you know what you are doing and are willing to live without stack
# traces, you can get a slightly smaller kernel by setting this option to
# n, but then RMK will have to kill you ;).
config FRAME_POINTER
bool
depends on !THUMB2_KERNEL
default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER
choice
prompt "Choose kernel unwinder"
default UNWINDER_ARM if AEABI && !FUNCTION_GRAPH_TRACER
default UNWINDER_FRAME_POINTER if !AEABI || FUNCTION_GRAPH_TRACER
help
If you say N here, the resulting kernel will be slightly smaller and
faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
when a problem occurs with the kernel, the information that is
reported is severely limited.
This determines which method will be used for unwinding kernel stack
traces for panics, oopses, bugs, warnings, perf, /proc/<pid>/stack,
livepatch, lockdep, and more.
config ARM_UNWIND
bool "Enable stack unwinding support (EXPERIMENTAL)"
config UNWINDER_FRAME_POINTER
bool "Frame pointer unwinder"
depends on !THUMB2_KERNEL && !CC_IS_CLANG
select ARCH_WANT_FRAME_POINTERS
select FRAME_POINTER
help
This option enables the frame pointer unwinder for unwinding
kernel stack traces.
config UNWINDER_ARM
bool "ARM EABI stack unwinder"
depends on AEABI
default y
select ARM_UNWIND
help
This option enables stack unwinding support in the kernel
using the information automatically generated by the
compiler. The resulting kernel image is slightly bigger but
the performance is not affected. Currently, this feature
only works with EABI compilers. If unsure say Y.
only works with EABI compilers.
config OLD_MCOUNT
endchoice
config ARM_UNWIND
bool
config FRAME_POINTER
bool
depends on FUNCTION_TRACER && FRAME_POINTER
default y
config DEBUG_USER
bool "Verbose user fault messages"

6
arch/arm/Makefile
View File

@ -74,7 +74,7 @@ endif
arch-$(CONFIG_CPU_32v5) =-D__LINUX_ARM_ARCH__=5 $(call cc-option,-march=armv5te,-march=armv4t)
arch-$(CONFIG_CPU_32v4T) =-D__LINUX_ARM_ARCH__=4 -march=armv4t
arch-$(CONFIG_CPU_32v4) =-D__LINUX_ARM_ARCH__=4 -march=armv4
arch-$(CONFIG_CPU_32v3) =-D__LINUX_ARM_ARCH__=3 -march=armv3
arch-$(CONFIG_CPU_32v3) =-D__LINUX_ARM_ARCH__=3 -march=armv3m
# Evaluate arch cc-option calls now
arch-y := $(arch-y)
@ -264,13 +264,9 @@ platdirs := $(patsubst %,arch/arm/plat-%/,$(sort $(plat-y)))
ifneq ($(CONFIG_ARCH_MULTIPLATFORM),y)
ifneq ($(CONFIG_ARM_SINGLE_ARMV7M),y)
ifeq ($(KBUILD_SRC),)
KBUILD_CPPFLAGS += $(patsubst %,-I%include,$(machdirs) $(platdirs))
else
KBUILD_CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs) $(platdirs))
endif
endif
endif
export TEXT_OFFSET GZFLAGS MMUEXT

43
arch/arm/boot/compressed/head.S
View File

@ -114,6 +114,35 @@
#endif
.endm
/*
* Debug kernel copy by printing the memory addresses involved
*/
.macro dbgkc, begin, end, cbegin, cend
#ifdef DEBUG
kputc #'\n'
kputc #'C'
kputc #':'
kputc #'0'
kputc #'x'
kphex \begin, 8 /* Start of compressed kernel */
kputc #'-'
kputc #'0'
kputc #'x'
kphex \end, 8 /* End of compressed kernel */
kputc #'-'
kputc #'>'
kputc #'0'
kputc #'x'
kphex \cbegin, 8 /* Start of kernel copy */
kputc #'-'
kputc #'0'
kputc #'x'
kphex \cend, 8 /* End of kernel copy */
kputc #'\n'
kputc #'\r'
#endif
.endm
.section ".start", #alloc, #execinstr
/*
* sort out different calling conventions
@ -450,6 +479,20 @@ dtb_check_done:
add r6, r9, r5
add r9, r9, r10
#ifdef DEBUG
sub r10, r6, r5
sub r10, r9, r10
/*
* We are about to copy the kernel to a new memory area.
* The boundaries of the new memory area can be found in
* r10 and r9, whilst r5 and r6 contain the boundaries
* of the memory we are going to copy.
* Calling dbgkc will help with the printing of this
* information.
*/
dbgkc r5, r6, r10, r9
#endif
1: ldmdb r6!, {r0 - r3, r10 - r12, lr}
cmp r6, r5
stmdb r9!, {r0 - r3, r10 - r12, lr}

11
arch/arm/include/asm/assembler.h
View File

@ -467,6 +467,17 @@ THUMB( orr \reg , \reg , #PSR_T_BIT )
#endif
.endm
.macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req
#ifdef CONFIG_CPU_SPECTRE
sub \tmp, \limit, #1
subs \tmp, \tmp, \addr @ tmp = limit - 1 - addr
addhs \tmp, \tmp, #1 @ if (tmp >= 0) {
subhss \tmp, \tmp, \size @ tmp = limit - (addr + size) }
movlo \addr, #0 @ if (tmp < 0) addr = NULL
csdb
#endif
.endm
.macro uaccess_disable, tmp, isb=1
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
/*

3
arch/arm/include/asm/ftrace.h
View File

@ -16,9 +16,6 @@ extern void __gnu_mcount_nc(void);
#ifdef CONFIG_DYNAMIC_FTRACE
struct dyn_arch_ftrace {
#ifdef CONFIG_OLD_MCOUNT
bool old_mcount;
#endif
};
static inline unsigned long ftrace_call_adjust(unsigned long addr)

4
arch/arm/include/asm/thread_info.h
View File

@ -121,8 +121,8 @@ extern void vfp_flush_hwstate(struct thread_info *);
struct user_vfp;
struct user_vfp_exc;
extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
struct user_vfp_exc __user *);
extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
struct user_vfp_exc *);
extern int vfp_restore_user_hwstate(struct user_vfp *,
struct user_vfp_exc *);
#endif

49
arch/arm/include/asm/uaccess.h
View File

@ -69,6 +69,14 @@ extern int __put_user_bad(void);
static inline void set_fs(mm_segment_t fs)
{
current_thread_info()->addr_limit = fs;
/*
* Prevent a mispredicted conditional call to set_fs from forwarding
* the wrong address limit to access_ok under speculation.
*/
dsb(nsh);
isb();
modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
}
@ -91,6 +99,32 @@ static inline void set_fs(mm_segment_t fs)
#define __inttype(x) \
__typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
/*
* Sanitise a uaccess pointer such that it becomes NULL if addr+size
* is above the current addr_limit.
*/
#define uaccess_mask_range_ptr(ptr, size) \
((__typeof__(ptr))__uaccess_mask_range_ptr(ptr, size))
static inline void __user *__uaccess_mask_range_ptr(const void __user *ptr,
size_t size)
{
void __user *safe_ptr = (void __user *)ptr;
unsigned long tmp;
asm volatile(
" sub %1, %3, #1\n"
" subs %1, %1, %0\n"
" addhs %1, %1, #1\n"
" subhss %1, %1, %2\n"
" movlo %0, #0\n"
: "+r" (safe_ptr), "=&r" (tmp)
: "r" (size), "r" (current_thread_info()->addr_limit)
: "cc");
csdb();
return safe_ptr;
}
/*
* Single-value transfer routines. They automatically use the right
* size if we just have the right pointer type. Note that the functions
@ -362,6 +396,14 @@ do { \
__pu_err; \
})
#ifdef CONFIG_CPU_SPECTRE
/*
* When mitigating Spectre variant 1.1, all accessors need to include
* verification of the address space.
*/
#define __put_user(x, ptr) put_user(x, ptr)
#else
#define __put_user(x, ptr) \
({ \
long __pu_err = 0; \
@ -369,12 +411,6 @@ do { \
__pu_err; \
})
#define __put_user_error(x, ptr, err) \
({ \
__put_user_switch((x), (ptr), (err), __put_user_nocheck); \
(void) 0; \
})
#define __put_user_nocheck(x, __pu_ptr, __err, __size) \
do { \
unsigned long __pu_addr = (unsigned long)__pu_ptr; \
@ -454,6 +490,7 @@ do { \
: "r" (x), "i" (-EFAULT) \
: "cc")
#endif /* !CONFIG_CPU_SPECTRE */
#ifdef CONFIG_MMU
extern unsigned long __must_check

3
arch/arm/kernel/armksyms.c
View File

@ -167,9 +167,6 @@ EXPORT_SYMBOL(_find_next_bit_be);
#endif
#ifdef CONFIG_FUNCTION_TRACER
#ifdef CONFIG_OLD_MCOUNT
EXPORT_SYMBOL(mcount);
#endif
EXPORT_SYMBOL(__gnu_mcount_nc);
#endif

9
arch/arm/kernel/entry-common.S
View File

@ -296,16 +296,15 @@ __sys_trace:
cmp scno, #-1 @ skip the syscall?
bne 2b
add sp, sp, #S_OFF @ restore stack
b ret_slow_syscall
__sys_trace_return:
str r0, [sp, #S_R0 + S_OFF]! @ save returned r0
__sys_trace_return_nosave:
enable_irq_notrace
mov r0, sp
bl syscall_trace_exit
b ret_slow_syscall
__sys_trace_return_nosave:
enable_irq_notrace
__sys_trace_return:
str r0, [sp, #S_R0 + S_OFF]! @ save returned r0
mov r0, sp
bl syscall_trace_exit
b ret_slow_syscall

75
arch/arm/kernel/entry-ftrace.S
View File

@ -15,23 +15,8 @@
* start of every function. In mcount, apart from the function's address (in
* lr), we need to get hold of the function's caller's address.
*
* Older GCCs (pre-4.4) inserted a call to a routine called mcount like this:
*
* bl mcount
*
* These versions have the limitation that in order for the mcount routine to
* be able to determine the function's caller's address, an APCS-style frame
* pointer (which is set up with something like the code below) is required.
*
* mov ip, sp
* push {fp, ip, lr, pc}
* sub fp, ip, #4
*
* With EABI, these frame pointers are not available unless -mapcs-frame is
* specified, and if building as Thumb-2, not even then.
*
* Newer GCCs (4.4+) solve this problem by introducing a new version of mcount,
* with call sites like:
* Newer GCCs (4.4+) solve this problem by using a version of mcount with call
* sites like:
*
* push {lr}
* bl __gnu_mcount_nc
@ -46,17 +31,10 @@
* allows it to be clobbered in subroutines and doesn't use it to hold
* parameters.)
*
* When using dynamic ftrace, we patch out the mcount call by a "mov r0, r0"
* for the mcount case, and a "pop {lr}" for the __gnu_mcount_nc case (see
* arch/arm/kernel/ftrace.c).
* When using dynamic ftrace, we patch out the mcount call by a "pop {lr}"
* instead of the __gnu_mcount_nc call (see arch/arm/kernel/ftrace.c).
*/
#ifndef CONFIG_OLD_MCOUNT
#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4))
#error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0.
#endif
#endif
.macro mcount_adjust_addr rd, rn
bic \rd, \rn, #1 @ clear the Thumb bit if present
sub \rd, \rd, #MCOUNT_INSN_SIZE
@ -209,51 +187,6 @@ ftrace_graph_call\suffix:
mcount_exit
.endm
#ifdef CONFIG_OLD_MCOUNT
/*
* mcount
*/
.macro mcount_enter
stmdb sp!, {r0-r3, lr}
.endm
.macro mcount_get_lr reg
ldr \reg, [fp, #-4]
.endm
.macro mcount_exit
ldr lr, [fp, #-4]
ldmia sp!, {r0-r3, pc}
.endm
ENTRY(mcount)
#ifdef CONFIG_DYNAMIC_FTRACE
stmdb sp!, {lr}
ldr lr, [fp, #-4]
ldmia sp!, {pc}
#else
__mcount _old
#endif
ENDPROC(mcount)
#ifdef CONFIG_DYNAMIC_FTRACE
ENTRY(ftrace_caller_old)
__ftrace_caller _old
ENDPROC(ftrace_caller_old)
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
ENTRY(ftrace_graph_caller_old)
__ftrace_graph_caller
ENDPROC(ftrace_graph_caller_old)
#endif
.purgem mcount_enter
.purgem mcount_get_lr
.purgem mcount_exit
#endif
/*
* __gnu_mcount_nc
*/

51
arch/arm/kernel/ftrace.c
View File

@ -47,30 +47,6 @@ void arch_ftrace_update_code(int command)
stop_machine(__ftrace_modify_code, &command, NULL);
}
#ifdef CONFIG_OLD_MCOUNT
#define OLD_MCOUNT_ADDR ((unsigned long) mcount)
#define OLD_FTRACE_ADDR ((unsigned long) ftrace_caller_old)
#define OLD_NOP 0xe1a00000 /* mov r0, r0 */
static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec)
{
return rec->arch.old_mcount ? OLD_NOP : NOP;
}
static unsigned long adjust_address(struct dyn_ftrace *rec, unsigned long addr)
{
if (!rec->arch.old_mcount)
return addr;
if (addr == MCOUNT_ADDR)
addr = OLD_MCOUNT_ADDR;
else if (addr == FTRACE_ADDR)
addr = OLD_FTRACE_ADDR;
return addr;
}
#else
static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec)
{
return NOP;
@ -80,7 +56,6 @@ static unsigned long adjust_address(struct dyn_ftrace *rec, unsigned long addr)
{
return addr;
}
#endif
int ftrace_arch_code_modify_prepare(void)
{
@ -150,15 +125,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
}
#endif
#ifdef CONFIG_OLD_MCOUNT
if (!ret) {
pc = (unsigned long)&ftrace_call_old;
new = ftrace_call_replace(pc, (unsigned long)func);
ret = ftrace_modify_code(pc, 0, new, false);
}
#endif
return ret;
}
@ -203,16 +169,6 @@ int ftrace_make_nop(struct module *mod,
new = ftrace_nop_replace(rec);
ret = ftrace_modify_code(ip, old, new, true);
#ifdef CONFIG_OLD_MCOUNT
if (ret == -EINVAL && addr == MCOUNT_ADDR) {
rec->arch.old_mcount = true;
old = ftrace_call_replace(ip, adjust_address(rec, addr));
new = ftrace_nop_replace(rec);
ret = ftrace_modify_code(ip, old, new, true);
}
#endif
return ret;
}
@ -290,13 +246,6 @@ static int ftrace_modify_graph_caller(bool enable)
#endif
#ifdef CONFIG_OLD_MCOUNT
if (!ret)
ret = __ftrace_modify_caller(&ftrace_graph_call_old,
ftrace_graph_caller_old,
enable);
#endif
return ret;
}

78
arch/arm/kernel/signal.c
View File

@ -77,8 +77,6 @@ static int preserve_iwmmxt_context(struct iwmmxt_sigframe __user *frame)
kframe->magic = IWMMXT_MAGIC;
kframe->size = IWMMXT_STORAGE_SIZE;
iwmmxt_task_copy(current_thread_info(), &kframe->storage);
err = __copy_to_user(frame, kframe, sizeof(*frame));
} else {
/*
* For bug-compatibility with older kernels, some space
@ -86,10 +84,14 @@ static int preserve_iwmmxt_context(struct iwmmxt_sigframe __user *frame)
* Set the magic and size appropriately so that properly
* written userspace can skip it reliably:
*/
__put_user_error(DUMMY_MAGIC, &frame->magic, err);
__put_user_error(IWMMXT_STORAGE_SIZE, &frame->size, err);
*kframe = (struct iwmmxt_sigframe) {
.magic = DUMMY_MAGIC,
.size = IWMMXT_STORAGE_SIZE,
};
}
err = __copy_to_user(frame, kframe, sizeof(*kframe));
return err;
}
@ -135,17 +137,18 @@ static int restore_iwmmxt_context(char __user **auxp)
static int preserve_vfp_context(struct vfp_sigframe __user *frame)
{
const unsigned long magic = VFP_MAGIC;
const unsigned long size = VFP_STORAGE_SIZE;
struct vfp_sigframe kframe;
int err = 0;
__put_user_error(magic, &frame->magic, err);
__put_user_error(size, &frame->size, err);
memset(&kframe, 0, sizeof(kframe));
kframe.magic = VFP_MAGIC;
kframe.size = VFP_STORAGE_SIZE;
err = vfp_preserve_user_clear_hwstate(&kframe.ufp, &kframe.ufp_exc);
if (err)
return -EFAULT;
return err;
return vfp_preserve_user_clear_hwstate(&frame->ufp, &frame->ufp_exc);
return __copy_to_user(frame, &kframe, sizeof(kframe));
}
static int restore_vfp_context(char __user **auxp)
@ -288,30 +291,35 @@ static int
setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set)
{
struct aux_sigframe __user *aux;
struct sigcontext context;
int err = 0;
__put_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err);
__put_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err);
__put_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err);
__put_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err);
__put_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err);
__put_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err);
__put_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err);
__put_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err);
__put_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err);
__put_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err);
__put_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err);
__put_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err);
__put_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err);
__put_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err);
__put_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err);
__put_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err);
__put_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err);
context = (struct sigcontext) {
.arm_r0 = regs->ARM_r0,
.arm_r1 = regs->ARM_r1,
.arm_r2 = regs->ARM_r2,
.arm_r3 = regs->ARM_r3,
.arm_r4 = regs->ARM_r4,
.arm_r5 = regs->ARM_r5,
.arm_r6 = regs->ARM_r6,
.arm_r7 = regs->ARM_r7,
.arm_r8 = regs->ARM_r8,
.arm_r9 = regs->ARM_r9,
.arm_r10 = regs->ARM_r10,
.arm_fp = regs->ARM_fp,
.arm_ip = regs->ARM_ip,
.arm_sp = regs->ARM_sp,
.arm_lr = regs->ARM_lr,
.arm_pc = regs->ARM_pc,
.arm_cpsr = regs->ARM_cpsr,
__put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no, err);
__put_user_error(current->thread.error_code, &sf->uc.uc_mcontext.error_code, err);
__put_user_error(current->thread.address, &sf->uc.uc_mcontext.fault_address, err);
__put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
.trap_no = current->thread.trap_no,
.error_code = current->thread.error_code,
.fault_address = current->thread.address,
.oldmask = set->sig[0],
};
err |= __copy_to_user(&sf->uc.uc_mcontext, &context, sizeof(context));
err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
@ -328,7 +336,7 @@ setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set)
if (err == 0)
err |= preserve_vfp_context(&aux->vfp);
#endif
__put_user_error(0, &aux->end_magic, err);
err |= __put_user(0, &aux->end_magic);
return err;
}
@ -491,7 +499,7 @@ setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
/*
* Set uc.uc_flags to a value which sc.trap_no would never have.
*/
__put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
err = __put_user(0x5ac3c35a, &frame->uc.uc_flags);
err |= setup_sigframe(frame, regs, set);
if (err == 0)
@ -511,8 +519,8 @@ setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
__put_user_error(0, &frame->sig.uc.uc_flags, err);
__put_user_error(NULL, &frame->sig.uc.uc_link, err);
err |= __put_user(0, &frame->sig.uc.uc_flags);
err |= __put_user(NULL, &frame->sig.uc.uc_link);
err |= __save_altstack(&frame->sig.uc.uc_stack, regs->ARM_sp);
err |= setup_sigframe(&frame->sig, regs, set);

8
arch/arm/kernel/sys_oabi-compat.c
View File

@ -277,6 +277,7 @@ asmlinkage long sys_oabi_epoll_wait(int epfd,
int maxevents, int timeout)
{
struct epoll_event *kbuf;
struct oabi_epoll_event e;
mm_segment_t fs;
long ret, err, i;
@ -295,8 +296,11 @@ asmlinkage long sys_oabi_epoll_wait(int epfd,
set_fs(fs);
err = 0;
for (i = 0; i < ret; i++) {
__put_user_error(kbuf[i].events, &events->events, err);
__put_user_error(kbuf[i].data, &events->data, err);
e.events = kbuf[i].events;
e.data = kbuf[i].data;
err = __copy_to_user(events, &e, sizeof(e));
if (err)
break;
events++;
}
kfree(kbuf);

6
arch/arm/lib/copy_from_user.S
View File

@ -93,11 +93,7 @@ ENTRY(arm_copy_from_user)
#ifdef CONFIG_CPU_SPECTRE
get_thread_info r3
ldr r3, [r3, #TI_ADDR_LIMIT]
adds ip, r1, r2 @ ip=addr+size
sub r3, r3, #1 @ addr_limit - 1
cmpcc ip, r3 @ if (addr+size > addr_limit - 1)
movcs r1, #0 @ addr = NULL
csdb
uaccess_mask_range_ptr r1, r2, r3, ip
#endif
#include "copy_template.S"

6
arch/arm/lib/copy_to_user.S
View File

@ -94,6 +94,11 @@
ENTRY(__copy_to_user_std)
WEAK(arm_copy_to_user)
#ifdef CONFIG_CPU_SPECTRE
get_thread_info r3
ldr r3, [r3, #TI_ADDR_LIMIT]
uaccess_mask_range_ptr r0, r2, r3, ip
#endif
#include "copy_template.S"
@ -108,4 +113,3 @@ ENDPROC(__copy_to_user_std)
rsb r0, r0, r2
copy_abort_end
.popsection

3
arch/arm/lib/uaccess_with_memcpy.c
View File

@ -152,7 +152,8 @@ arm_copy_to_user(void __user *to, const void *from, unsigned long n)
n = __copy_to_user_std(to, from, n);
uaccess_restore(ua_flags);
} else {
n = __copy_to_user_memcpy(to, from, n);
n = __copy_to_user_memcpy(uaccess_mask_range_ptr(to, n),
from, n);
}
return n;
}

20
arch/arm/vfp/vfpmodule.c
View File

@ -553,12 +553,11 @@ void vfp_flush_hwstate(struct thread_info *thread)
* Save the current VFP state into the provided structures and prepare
* for entry into a new function (signal handler).
*/
int vfp_preserve_user_clear_hwstate(struct user_vfp __user *ufp,
struct user_vfp_exc __user *ufp_exc)
int vfp_preserve_user_clear_hwstate(struct user_vfp *ufp,
struct user_vfp_exc *ufp_exc)
{
struct thread_info *thread = current_thread_info();
struct vfp_hard_struct *hwstate = &thread->vfpstate.hard;
int err = 0;
/* Ensure that the saved hwstate is up-to-date. */
vfp_sync_hwstate(thread);
@ -567,22 +566,19 @@ int vfp_preserve_user_clear_hwstate(struct user_vfp __user *ufp,
* Copy the floating point registers. There can be unused
* registers see asm/hwcap.h for details.
*/
err |= __copy_to_user(&ufp->fpregs, &hwstate->fpregs,
sizeof(hwstate->fpregs));
memcpy(&ufp->fpregs, &hwstate->fpregs, sizeof(hwstate->fpregs));
/*
* Copy the status and control register.
*/
__put_user_error(hwstate->fpscr, &ufp->fpscr, err);
ufp->fpscr = hwstate->fpscr;
/*
* Copy the exception registers.
*/
__put_user_error(hwstate->fpexc, &ufp_exc->fpexc, err);
__put_user_error(hwstate->fpinst, &ufp_exc->fpinst, err);
__put_user_error(hwstate->fpinst2, &ufp_exc->fpinst2, err);
if (err)
return -EFAULT;
ufp_exc->fpexc = hwstate->fpexc;
ufp_exc->fpinst = hwstate->fpinst;
ufp_exc->fpinst2 = ufp_exc->fpinst2;
/* Ensure that VFP is disabled. */
vfp_flush_hwstate(thread);

6
lib/Kconfig.debug
View File

@ -1179,7 +1179,7 @@ config LOCKDEP
bool
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
select STACKTRACE
select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 && !MICROBLAZE && !ARC && !X86
select FRAME_POINTER if !MIPS && !PPC && !ARM && !S390 && !MICROBLAZE && !ARC && !X86
select KALLSYMS
select KALLSYMS_ALL
@ -1590,7 +1590,7 @@ config FAULT_INJECTION_STACKTRACE_FILTER
depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
depends on !X86_64
select STACKTRACE
select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC && !X86
select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86
help
Provide stacktrace filter for fault-injection capabilities
@ -1599,7 +1599,7 @@ config LATENCYTOP
depends on DEBUG_KERNEL
depends on STACKTRACE_SUPPORT
depends on PROC_FS
select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC && !X86
select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86
select KALLSYMS
select KALLSYMS_ALL
select STACKTRACE