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- A bunch of changes towards streamlining low level asm helpers' calling

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conventions so that former can be converted to C eventually
 
 - Simplify PUSH_AND_CLEAR_REGS so that it can be used at the system call
 entry paths instead of having opencoded, slightly different variants of it
 everywhere
 
 - Misc other fixes
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Merge tag 'x86_asm_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 asm updates from Borislav Petkov:

 - A bunch of changes towards streamlining low level asm helpers'
   calling conventions so that former can be converted to C eventually

 - Simplify PUSH_AND_CLEAR_REGS so that it can be used at the system
   call entry paths instead of having opencoded, slightly different
   variants of it everywhere

 - Misc other fixes

* tag 'x86_asm_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/entry: Fix register corruption in compat syscall
  objtool: Fix STACK_FRAME_NON_STANDARD reloc type
  linkage: Fix issue with missing symbol size
  x86/entry: Remove skip_r11rcx
  x86/entry: Use PUSH_AND_CLEAR_REGS for compat
  x86/entry: Simplify entry_INT80_compat()
  x86/mm: Simplify RESERVE_BRK()
  x86/entry: Convert SWAPGS to swapgs and remove the definition of SWAPGS
  x86/entry: Don't call error_entry() for XENPV
  x86/entry: Move CLD to the start of the idtentry macro
  x86/entry: Move PUSH_AND_CLEAR_REGS out of error_entry()
  x86/entry: Switch the stack after error_entry() returns
  x86/traps: Use pt_regs directly in fixup_bad_iret()
This commit is contained in:
Linus Torvalds 2022-05-23 18:08:46 -07:00
commit 42b682a30f
10 changed files with 86 additions and 177 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
arch/x86/entry/calling.h
View File

@ -63,7 +63,7 @@ For 32-bit we have the following conventions - kernel is built with
* for assembly code:
*/
.macro PUSH_REGS rdx=%rdx rax=%rax save_ret=0
.macro PUSH_REGS rdx=%rdx rcx=%rcx rax=%rax save_ret=0
.if \save_ret
pushq %rsi /* pt_regs->si */
movq 8(%rsp), %rsi /* temporarily store the return address in %rsi */
@ -73,7 +73,7 @@ For 32-bit we have the following conventions - kernel is built with
pushq %rsi /* pt_regs->si */
.endif
pushq \rdx /* pt_regs->dx */
pushq %rcx /* pt_regs->cx */
pushq \rcx /* pt_regs->cx */
pushq \rax /* pt_regs->ax */
pushq %r8 /* pt_regs->r8 */
pushq %r9 /* pt_regs->r9 */
@ -99,6 +99,7 @@ For 32-bit we have the following conventions - kernel is built with
* well before they could be put to use in a speculative execution
* gadget.
*/
xorl %esi, %esi /* nospec si */
xorl %edx, %edx /* nospec dx */
xorl %ecx, %ecx /* nospec cx */
xorl %r8d, %r8d /* nospec r8 */
@ -114,32 +115,24 @@ For 32-bit we have the following conventions - kernel is built with
.endm
.macro PUSH_AND_CLEAR_REGS rdx=%rdx rax=%rax save_ret=0
PUSH_REGS rdx=\rdx, rax=\rax, save_ret=\save_ret
.macro PUSH_AND_CLEAR_REGS rdx=%rdx rcx=%rcx rax=%rax save_ret=0
PUSH_REGS rdx=\rdx, rcx=\rcx, rax=\rax, save_ret=\save_ret
CLEAR_REGS
.endm
.macro POP_REGS pop_rdi=1 skip_r11rcx=0
.macro POP_REGS pop_rdi=1
popq %r15
popq %r14
popq %r13
popq %r12
popq %rbp
popq %rbx
.if \skip_r11rcx
popq %rsi
.else
popq %r11
.endif
popq %r10
popq %r9
popq %r8
popq %rax
.if \skip_r11rcx
popq %rsi
.else
popq %rcx
.endif
popq %rdx
popq %rsi
.if \pop_rdi

56
arch/x86/entry/entry_64.S
View File

@ -191,8 +191,7 @@ SYM_INNER_LABEL(entry_SYSCALL_64_after_hwframe, SYM_L_GLOBAL)
* perf profiles. Nothing jumps here.
*/
syscall_return_via_sysret:
/* rcx and r11 are already restored (see code above) */
POP_REGS pop_rdi=0 skip_r11rcx=1
POP_REGS pop_rdi=0
/*
* Now all regs are restored except RSP and RDI.
@ -323,6 +322,14 @@ SYM_CODE_END(ret_from_fork)
#endif
.endm
/* Save all registers in pt_regs */
SYM_CODE_START_LOCAL(push_and_clear_regs)
UNWIND_HINT_FUNC
PUSH_AND_CLEAR_REGS save_ret=1
ENCODE_FRAME_POINTER 8
RET
SYM_CODE_END(push_and_clear_regs)
/**
* idtentry_body - Macro to emit code calling the C function
* @cfunc: C function to be called
@ -330,7 +337,21 @@ SYM_CODE_END(ret_from_fork)
*/
.macro idtentry_body cfunc has_error_code:req
call error_entry
call push_and_clear_regs
UNWIND_HINT_REGS
/*
* Call error_entry() and switch to the task stack if from userspace.
*
* When in XENPV, it is already in the task stack, and it can't fault
* for native_iret() nor native_load_gs_index() since XENPV uses its
* own pvops for IRET and load_gs_index(). And it doesn't need to
* switch the CR3. So it can skip invoking error_entry().
*/
ALTERNATIVE "call error_entry; movq %rax, %rsp", \
"", X86_FEATURE_XENPV
ENCODE_FRAME_POINTER
UNWIND_HINT_REGS
movq %rsp, %rdi /* pt_regs pointer into 1st argument*/
@ -363,6 +384,7 @@ SYM_CODE_START(\asmsym)
UNWIND_HINT_IRET_REGS offset=\has_error_code*8
ENDBR
ASM_CLAC
cld
.if \has_error_code == 0
pushq $-1 /* ORIG_RAX: no syscall to restart */
@ -431,6 +453,7 @@ SYM_CODE_START(\asmsym)
UNWIND_HINT_IRET_REGS
ENDBR
ASM_CLAC
cld
pushq $-1 /* ORIG_RAX: no syscall to restart */
@ -487,6 +510,7 @@ SYM_CODE_START(\asmsym)
UNWIND_HINT_IRET_REGS
ENDBR
ASM_CLAC
cld
/*
* If the entry is from userspace, switch stacks and treat it as
@ -550,6 +574,7 @@ SYM_CODE_START(\asmsym)
UNWIND_HINT_IRET_REGS offset=8
ENDBR
ASM_CLAC
cld
/* paranoid_entry returns GS information for paranoid_exit in EBX. */
call paranoid_entry
@ -875,7 +900,6 @@ SYM_CODE_END(xen_failsafe_callback)
*/
SYM_CODE_START_LOCAL(paranoid_entry)
UNWIND_HINT_FUNC
cld
PUSH_AND_CLEAR_REGS save_ret=1
ENCODE_FRAME_POINTER 8
@ -989,13 +1013,10 @@ SYM_CODE_START_LOCAL(paranoid_exit)
SYM_CODE_END(paranoid_exit)
/*
* Save all registers in pt_regs, and switch GS if needed.
* Switch GS and CR3 if needed.
*/
SYM_CODE_START_LOCAL(error_entry)
UNWIND_HINT_FUNC
cld
PUSH_AND_CLEAR_REGS save_ret=1
ENCODE_FRAME_POINTER 8
testb $3, CS+8(%rsp)
jz .Lerror_kernelspace
@ -1003,19 +1024,15 @@ SYM_CODE_START_LOCAL(error_entry)
* We entered from user mode or we're pretending to have entered
* from user mode due to an IRET fault.
*/
SWAPGS
swapgs
FENCE_SWAPGS_USER_ENTRY
/* We have user CR3. Change to kernel CR3. */
SWITCH_TO_KERNEL_CR3 scratch_reg=%rax
leaq 8(%rsp), %rdi /* arg0 = pt_regs pointer */
.Lerror_entry_from_usermode_after_swapgs:
/* Put us onto the real thread stack. */
popq %r12 /* save return addr in %12 */
movq %rsp, %rdi /* arg0 = pt_regs pointer */
call sync_regs
movq %rax, %rsp /* switch stack */
ENCODE_FRAME_POINTER
pushq %r12
RET
/*
@ -1039,7 +1056,7 @@ SYM_CODE_START_LOCAL(error_entry)
* gsbase and proceed. We'll fix up the exception and land in
* .Lgs_change's error handler with kernel gsbase.
*/
SWAPGS
swapgs
/*
* Issue an LFENCE to prevent GS speculation, regardless of whether it is a
@ -1047,6 +1064,7 @@ SYM_CODE_START_LOCAL(error_entry)
*/
.Lerror_entry_done_lfence:
FENCE_SWAPGS_KERNEL_ENTRY
leaq 8(%rsp), %rax /* return pt_regs pointer */
RET
.Lbstep_iret:
@ -1059,7 +1077,7 @@ SYM_CODE_START_LOCAL(error_entry)
* We came from an IRET to user mode, so we have user
* gsbase and CR3. Switch to kernel gsbase and CR3:
*/
SWAPGS
swapgs
FENCE_SWAPGS_USER_ENTRY
SWITCH_TO_KERNEL_CR3 scratch_reg=%rax
@ -1067,9 +1085,9 @@ SYM_CODE_START_LOCAL(error_entry)
* Pretend that the exception came from user mode: set up pt_regs
* as if we faulted immediately after IRET.
*/
mov %rsp, %rdi
leaq 8(%rsp), %rdi /* arg0 = pt_regs pointer */
call fixup_bad_iret
mov %rax, %rsp
mov %rax, %rdi
jmp .Lerror_entry_from_usermode_after_swapgs
SYM_CODE_END(error_entry)
@ -1132,6 +1150,7 @@ SYM_CODE_START(asm_exc_nmi)
*/
ASM_CLAC
cld
/* Use %rdx as our temp variable throughout */
pushq %rdx
@ -1151,7 +1170,6 @@ SYM_CODE_START(asm_exc_nmi)
*/
swapgs
cld
FENCE_SWAPGS_USER_ENTRY
SWITCH_TO_KERNEL_CR3 scratch_reg=%rdx
movq %rsp, %rdx

106
arch/x86/entry/entry_64_compat.S
View File

@ -50,7 +50,7 @@ SYM_CODE_START(entry_SYSENTER_compat)
UNWIND_HINT_EMPTY
ENDBR
/* Interrupts are off on entry. */
SWAPGS
swapgs
pushq %rax
SWITCH_TO_KERNEL_CR3 scratch_reg=%rax
@ -83,32 +83,7 @@ SYM_INNER_LABEL(entry_SYSENTER_compat_after_hwframe, SYM_L_GLOBAL)
movl %eax, %eax
pushq %rax /* pt_regs->orig_ax */
pushq %rdi /* pt_regs->di */
pushq %rsi /* pt_regs->si */
pushq %rdx /* pt_regs->dx */
pushq %rcx /* pt_regs->cx */
pushq $-ENOSYS /* pt_regs->ax */
pushq $0 /* pt_regs->r8 = 0 */
xorl %r8d, %r8d /* nospec r8 */
pushq $0 /* pt_regs->r9 = 0 */
xorl %r9d, %r9d /* nospec r9 */
pushq $0 /* pt_regs->r10 = 0 */
xorl %r10d, %r10d /* nospec r10 */
pushq $0 /* pt_regs->r11 = 0 */
xorl %r11d, %r11d /* nospec r11 */
pushq %rbx /* pt_regs->rbx */
xorl %ebx, %ebx /* nospec rbx */
pushq %rbp /* pt_regs->rbp (will be overwritten) */
xorl %ebp, %ebp /* nospec rbp */
pushq $0 /* pt_regs->r12 = 0 */
xorl %r12d, %r12d /* nospec r12 */
pushq $0 /* pt_regs->r13 = 0 */
xorl %r13d, %r13d /* nospec r13 */
pushq $0 /* pt_regs->r14 = 0 */
xorl %r14d, %r14d /* nospec r14 */
pushq $0 /* pt_regs->r15 = 0 */
xorl %r15d, %r15d /* nospec r15 */
PUSH_AND_CLEAR_REGS rax=$-ENOSYS
UNWIND_HINT_REGS
cld
@ -225,35 +200,7 @@ SYM_INNER_LABEL(entry_SYSCALL_compat_safe_stack, SYM_L_GLOBAL)
SYM_INNER_LABEL(entry_SYSCALL_compat_after_hwframe, SYM_L_GLOBAL)
movl %eax, %eax /* discard orig_ax high bits */
pushq %rax /* pt_regs->orig_ax */
pushq %rdi /* pt_regs->di */
pushq %rsi /* pt_regs->si */
xorl %esi, %esi /* nospec si */
pushq %rdx /* pt_regs->dx */
xorl %edx, %edx /* nospec dx */
pushq %rbp /* pt_regs->cx (stashed in bp) */
xorl %ecx, %ecx /* nospec cx */
pushq $-ENOSYS /* pt_regs->ax */
pushq $0 /* pt_regs->r8 = 0 */
xorl %r8d, %r8d /* nospec r8 */
pushq $0 /* pt_regs->r9 = 0 */
xorl %r9d, %r9d /* nospec r9 */
pushq $0 /* pt_regs->r10 = 0 */
xorl %r10d, %r10d /* nospec r10 */
pushq $0 /* pt_regs->r11 = 0 */
xorl %r11d, %r11d /* nospec r11 */
pushq %rbx /* pt_regs->rbx */
xorl %ebx, %ebx /* nospec rbx */
pushq %rbp /* pt_regs->rbp (will be overwritten) */
xorl %ebp, %ebp /* nospec rbp */
pushq $0 /* pt_regs->r12 = 0 */
xorl %r12d, %r12d /* nospec r12 */
pushq $0 /* pt_regs->r13 = 0 */
xorl %r13d, %r13d /* nospec r13 */
pushq $0 /* pt_regs->r14 = 0 */
xorl %r14d, %r14d /* nospec r14 */
pushq $0 /* pt_regs->r15 = 0 */
xorl %r15d, %r15d /* nospec r15 */
PUSH_AND_CLEAR_REGS rcx=%rbp rax=$-ENOSYS
UNWIND_HINT_REGS
movq %rsp, %rdi
@ -367,54 +314,25 @@ SYM_CODE_START(entry_INT80_compat)
/* switch to thread stack expects orig_ax and rdi to be pushed */
pushq %rax /* pt_regs->orig_ax */
pushq %rdi /* pt_regs->di */
/* Need to switch before accessing the thread stack. */
SWITCH_TO_KERNEL_CR3 scratch_reg=%rdi
SWITCH_TO_KERNEL_CR3 scratch_reg=%rax
/* In the Xen PV case we already run on the thread stack. */
ALTERNATIVE "", "jmp .Lint80_keep_stack", X86_FEATURE_XENPV
movq %rsp, %rdi
movq %rsp, %rax
movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp
pushq 6*8(%rdi) /* regs->ss */
pushq 5*8(%rdi) /* regs->rsp */
pushq 4*8(%rdi) /* regs->eflags */
pushq 3*8(%rdi) /* regs->cs */
pushq 2*8(%rdi) /* regs->ip */
pushq 1*8(%rdi) /* regs->orig_ax */
pushq (%rdi) /* pt_regs->di */
pushq 5*8(%rax) /* regs->ss */
pushq 4*8(%rax) /* regs->rsp */
pushq 3*8(%rax) /* regs->eflags */
pushq 2*8(%rax) /* regs->cs */
pushq 1*8(%rax) /* regs->ip */
pushq 0*8(%rax) /* regs->orig_ax */
.Lint80_keep_stack:
pushq %rsi /* pt_regs->si */
xorl %esi, %esi /* nospec si */
pushq %rdx /* pt_regs->dx */
xorl %edx, %edx /* nospec dx */
pushq %rcx /* pt_regs->cx */
xorl %ecx, %ecx /* nospec cx */
pushq $-ENOSYS /* pt_regs->ax */
pushq %r8 /* pt_regs->r8 */
xorl %r8d, %r8d /* nospec r8 */
pushq %r9 /* pt_regs->r9 */
xorl %r9d, %r9d /* nospec r9 */
pushq %r10 /* pt_regs->r10*/
xorl %r10d, %r10d /* nospec r10 */
pushq %r11 /* pt_regs->r11 */
xorl %r11d, %r11d /* nospec r11 */
pushq %rbx /* pt_regs->rbx */
xorl %ebx, %ebx /* nospec rbx */
pushq %rbp /* pt_regs->rbp */
xorl %ebp, %ebp /* nospec rbp */
pushq %r12 /* pt_regs->r12 */
xorl %r12d, %r12d /* nospec r12 */
pushq %r13 /* pt_regs->r13 */
xorl %r13d, %r13d /* nospec r13 */
pushq %r14 /* pt_regs->r14 */
xorl %r14d, %r14d /* nospec r14 */
pushq %r15 /* pt_regs->r15 */
xorl %r15d, %r15d /* nospec r15 */
PUSH_AND_CLEAR_REGS rax=$-ENOSYS
UNWIND_HINT_REGS
cld

8
arch/x86/include/asm/irqflags.h
View File

@ -137,14 +137,6 @@ static __always_inline void arch_local_irq_restore(unsigned long flags)
if (!arch_irqs_disabled_flags(flags))
arch_local_irq_enable();
}
#else
#ifdef CONFIG_X86_64
#ifdef CONFIG_XEN_PV
#define SWAPGS ALTERNATIVE "swapgs", "", X86_FEATURE_XENPV
#else
#define SWAPGS swapgs
#endif
#endif
#endif /* !__ASSEMBLY__ */
#endif

30
arch/x86/include/asm/setup.h
View File

@ -108,27 +108,19 @@ extern unsigned long _brk_end;
void *extend_brk(size_t size, size_t align);
/*
* Reserve space in the brk section. The name must be unique within
* the file, and somewhat descriptive. The size is in bytes. Must be
* used at file scope.
* Reserve space in the brk section. The name must be unique within the file,
* and somewhat descriptive. The size is in bytes.
*
* (This uses a temp function to wrap the asm so we can pass it the
* size parameter; otherwise we wouldn't be able to. We can't use a
* "section" attribute on a normal variable because it always ends up
* being @progbits, which ends up allocating space in the vmlinux
* executable.)
* The allocation is done using inline asm (rather than using a section
* attribute on a normal variable) in order to allow the use of @nobits, so
* that it doesn't take up any space in the vmlinux file.
*/
#define RESERVE_BRK(name,sz) \
static void __section(".discard.text") __noendbr __used notrace \
__brk_reservation_fn_##name##__(void) { \
asm volatile ( \
".pushsection .brk_reservation,\"aw\",@nobits;" \
".brk." #name ":" \
" 1:.skip %c0;" \
" .size .brk." #name ", . - 1b;" \
" .popsection" \
: : "i" (sz)); \
}
#define RESERVE_BRK(name, size) \
asm(".pushsection .brk_reservation,\"aw\",@nobits\n\t" \
".brk." #name ":\n\t" \
".skip " __stringify(size) "\n\t" \
".size .brk." #name ", " __stringify(size) "\n\t" \
".popsection\n\t")
extern void probe_roms(void);
#ifdef __i386__

2
arch/x86/include/asm/traps.h
View File

@ -13,7 +13,7 @@
#ifdef CONFIG_X86_64
asmlinkage __visible notrace struct pt_regs *sync_regs(struct pt_regs *eregs);
asmlinkage __visible notrace
struct bad_iret_stack *fixup_bad_iret(struct bad_iret_stack *s);
struct pt_regs *fixup_bad_iret(struct pt_regs *bad_regs);
void __init trap_init(void);
asmlinkage __visible noinstr struct pt_regs *vc_switch_off_ist(struct pt_regs *eregs);
#endif

19
arch/x86/kernel/traps.c
View File

@ -898,14 +898,10 @@ sync:
}
#endif
struct bad_iret_stack {
void *error_entry_ret;
struct pt_regs regs;
};
asmlinkage __visible noinstr
struct bad_iret_stack *fixup_bad_iret(struct bad_iret_stack *s)
asmlinkage __visible noinstr struct pt_regs *fixup_bad_iret(struct pt_regs *bad_regs)
{
struct pt_regs tmp, *new_stack;
/*
* This is called from entry_64.S early in handling a fault
* caused by a bad iret to user mode. To handle the fault
@ -914,19 +910,18 @@ struct bad_iret_stack *fixup_bad_iret(struct bad_iret_stack *s)
* just below the IRET frame) and we want to pretend that the
* exception came from the IRET target.
*/
struct bad_iret_stack tmp, *new_stack =
(struct bad_iret_stack *)__this_cpu_read(cpu_tss_rw.x86_tss.sp0) - 1;
new_stack = (struct pt_regs *)__this_cpu_read(cpu_tss_rw.x86_tss.sp0) - 1;
/* Copy the IRET target to the temporary storage. */
__memcpy(&tmp.regs.ip, (void *)s->regs.sp, 5*8);
__memcpy(&tmp.ip, (void *)bad_regs->sp, 5*8);
/* Copy the remainder of the stack from the current stack. */
__memcpy(&tmp, s, offsetof(struct bad_iret_stack, regs.ip));
__memcpy(&tmp, bad_regs, offsetof(struct pt_regs, ip));
/* Update the entry stack */
__memcpy(new_stack, &tmp, sizeof(tmp));
BUG_ON(!user_mode(&new_stack->regs));
BUG_ON(!user_mode(new_stack));
return new_stack;
}
#endif

15
include/linux/linkage.h
View File

@ -171,12 +171,9 @@
/* SYM_ALIAS -- use only if you have to */
#ifndef SYM_ALIAS
#define SYM_ALIAS(alias, name, sym_type, linkage) \
linkage(alias) ASM_NL \
.set alias, name ASM_NL \
.type alias sym_type ASM_NL \
.set .L__sym_size_##alias, .L__sym_size_##name ASM_NL \
.size alias, .L__sym_size_##alias
#define SYM_ALIAS(alias, name, linkage) \
linkage(alias) ASM_NL \
.set alias, name ASM_NL
#endif
/* === code annotations === */
@ -261,7 +258,7 @@
*/
#ifndef SYM_FUNC_ALIAS
#define SYM_FUNC_ALIAS(alias, name) \
SYM_ALIAS(alias, name, SYM_T_FUNC, SYM_L_GLOBAL)
SYM_ALIAS(alias, name, SYM_L_GLOBAL)
#endif
/*
@ -269,7 +266,7 @@
*/
#ifndef SYM_FUNC_ALIAS_LOCAL
#define SYM_FUNC_ALIAS_LOCAL(alias, name) \
SYM_ALIAS(alias, name, SYM_T_FUNC, SYM_L_LOCAL)
SYM_ALIAS(alias, name, SYM_L_LOCAL)
#endif
/*
@ -277,7 +274,7 @@
*/
#ifndef SYM_FUNC_ALIAS_WEAK
#define SYM_FUNC_ALIAS_WEAK(alias, name) \
SYM_ALIAS(alias, name, SYM_T_FUNC, SYM_L_WEAK)
SYM_ALIAS(alias, name, SYM_L_WEAK)
#endif
/* SYM_CODE_START -- use for non-C (special) functions */

4
include/linux/objtool.h
View File

@ -40,6 +40,8 @@ struct unwind_hint {
#ifdef CONFIG_STACK_VALIDATION
#include <asm/asm.h>
#ifndef __ASSEMBLY__
#define UNWIND_HINT(sp_reg, sp_offset, type, end) \
@ -137,7 +139,7 @@ struct unwind_hint {
.macro STACK_FRAME_NON_STANDARD func:req
.pushsection .discard.func_stack_frame_non_standard, "aw"
.long \func - .
_ASM_PTR \func
.popsection
.endm

4
tools/include/linux/objtool.h
View File

@ -40,6 +40,8 @@ struct unwind_hint {
#ifdef CONFIG_STACK_VALIDATION
#include <asm/asm.h>
#ifndef __ASSEMBLY__
#define UNWIND_HINT(sp_reg, sp_offset, type, end) \
@ -137,7 +139,7 @@ struct unwind_hint {
.macro STACK_FRAME_NON_STANDARD func:req
.pushsection .discard.func_stack_frame_non_standard, "aw"
.long \func - .
_ASM_PTR \func
.popsection
.endm