[PATCH 07/22] x86,extable: Extend extable functionality

Peter Zijlstra
2021-11-05T17:24:35Z

In order to remove further .fixup usage, extend the extable
infrastructure to take additional information from the extable entry
sites.

Specifically add _ASM_EXTABLE_TYPE_REG() and EX_TYPE_IMM_REG that
extend the existing _ASM_EXTABLE_TYPE() by taking an additional
register argument and encoding that and an s16 immediate into the
existing s32 type field. This limits the actual types to the first
byte, 255 seem plenty.

Also add a few flags into the type word, specifically CLEAR_AX and
CLEAR_DX which clear the return and extended return register.

Notes:
- due to the % in our register names it's hard to make it more
generally usable as arm64 did.
- the s16 is far larger than used in these patches, future extentions
can easily shrink this to get more bits.
- without the bitfield fix this will not compile, because: 0xFF > -1
and we can't even extract the TYPE field.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/include/asm/asm.h | 33 ++++++++++++++
arch/x86/include/asm/extable.h | 6 +-
arch/x86/include/asm/extable_fixup_types.h | 19 ++++++++
arch/x86/include/asm/insn-eval.h | 2
arch/x86/lib/insn-eval.c | 66 ++++++++++++++++++-----------
arch/x86/mm/extable.c | 40 +++++++++++++++--
arch/x86/net/bpf_jit_comp.c | 2
7 files changed, 136 insertions(+), 32 deletions(-)

--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -152,6 +152,31 @@

#else /* ! __ASSEMBLY__ */

+asm(
+" .macro extable_type_reg type:req reg:req\n"
+" .set found, 0\n"
+" .set regnr, 0\n"
+" .irp rs,rax,rcx,rdx,rbx,rsp,rbp,rsi,rdi,r8,r9,r10,r11,r12,r13,r14,r15\n"
+" .ifc \\reg, %\\rs\n"
+" .set found, found+1\n"
+" .long \\type + (regnr << 8)\n"
+" .endif\n"
+" .set regnr, regnr+1\n"
+" .endr\n"
+" .set regnr, 0\n"
+" .irp rs,eax,ecx,edx,ebx,esp,ebp,esi,edi,r8d,r9d,r10d,r11d,r12d,r13d,r14d,r15d\n"
+" .ifc \\reg, %\\rs\n"
+" .set found, found+1\n"
+" .long \\type + (regnr << 8)\n"
+" .endif\n"
+" .set regnr, regnr+1\n"
+" .endr\n"
+" .if (found != 1)\n"
+" .error \"extable_type_reg: bad register argument\"\n"
+" .endif\n"
+" .endm\n"
+);
+
# define _ASM_EXTABLE_TYPE(from, to, type) \
" .pushsection \"__ex_table\",\"a\"\n" \
" .balign 4\n" \
@@ -160,6 +185,14 @@
" .long " __stringify(type) " \n" \
" .popsection\n"

+# define _ASM_EXTABLE_TYPE_REG(from, to, type, reg) \
+ " .pushsection \"__ex_table\",\"a\"\n" \
+ " .balign 4\n" \
+ " .long (" #from ") - .\n" \
+ " .long (" #to ") - .\n" \
+ "extable_type_reg reg=" __stringify(reg) ", type=" __stringify(type) " \n"\
+ " .popsection\n"
+
/* For C file, we already have NOKPROBE_SYMBOL macro */

/*
--- a/arch/x86/include/asm/extable.h
+++ b/arch/x86/include/asm/extable.h
@@ -21,7 +21,7 @@
*/

struct exception_table_entry {
- int insn, fixup, type;
+ int insn, fixup, data;
};
struct pt_regs;

@@ -31,8 +31,8 @@ struct pt_regs;
do { \
(a)->fixup = (b)->fixup + (delta); \
(b)->fixup = (tmp).fixup - (delta); \
- (a)->type = (b)->type; \
- (b)->type = (tmp).type; \
+ (a)->data = (b)->data; \
+ (b)->data = (tmp).data; \
} while (0)

extern int fixup_exception(struct pt_regs *regs, int trapnr,
--- a/arch/x86/include/asm/extable_fixup_types.h
+++ b/arch/x86/include/asm/extable_fixup_types.h
@@ -2,6 +2,24 @@
#ifndef _ASM_X86_EXTABLE_FIXUP_TYPES_H
#define _ASM_X86_EXTABLE_FIXUP_TYPES_H

+#define EX_DATA_TYPE_MASK 0x000000FF
+#define EX_DATA_REG_MASK 0x00000F00
+#define EX_DATA_FLAG_MASK 0x0000F000
+#define EX_DATA_IMM_MASK 0xFFFF0000
+
+#define EX_DATA_REG_SHIFT 8
+#define EX_DATA_FLAG_SHIFT 12
+#define EX_DATA_IMM_SHIFT 16
+
+#define EX_DATA_FLAG(flag) ((flag) << EX_DATA_FLAG_SHIFT)
+#define EX_DATA_IMM(imm) ((imm) << EX_DATA_IMM_SHIFT)
+
+/* flags */
+#define EX_FLAG_CLEAR_AX EX_DATA_FLAG(1)
+#define EX_FLAG_CLEAR_DX EX_DATA_FLAG(2)
+#define EX_FLAG_CLEAR_AX_DX EX_DATA_FLAG(3)
+
+/* types */
#define EX_TYPE_NONE 0
#define EX_TYPE_DEFAULT 1
#define EX_TYPE_FAULT 2
@@ -20,5 +38,6 @@
#define EX_TYPE_FAULT_MCE_SAFE 13

#define EX_TYPE_POP_ZERO 14
+#define EX_TYPE_IMM_REG 15 /* reg := (long)imm */

#endif
--- a/arch/x86/include/asm/insn-eval.h
+++ b/arch/x86/include/asm/insn-eval.h
@@ -15,6 +15,8 @@
#define INSN_CODE_SEG_OPND_SZ(params) (params & 0xf)
#define INSN_CODE_SEG_PARAMS(oper_sz, addr_sz) (oper_sz | (addr_sz << 4))

+int pt_regs_offset(struct pt_regs *regs, int regno);
+
bool insn_has_rep_prefix(struct insn *insn);
void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs);
int insn_get_modrm_rm_off(struct insn *insn, struct pt_regs *regs);
--- a/arch/x86/lib/insn-eval.c
+++ b/arch/x86/lib/insn-eval.c
@@ -412,32 +412,39 @@ static short get_segment_selector(struct
#endif /* CONFIG_X86_64 */
}

-static int get_reg_offset(struct insn *insn, struct pt_regs *regs,
- enum reg_type type)
+static const int pt_regoff[] = {
+ offsetof(struct pt_regs, ax),
+ offsetof(struct pt_regs, cx),
+ offsetof(struct pt_regs, dx),
+ offsetof(struct pt_regs, bx),
+ offsetof(struct pt_regs, sp),
+ offsetof(struct pt_regs, bp),
+ offsetof(struct pt_regs, si),
+ offsetof(struct pt_regs, di),
+#ifdef CONFIG_X86_64
+ offsetof(struct pt_regs, r8),
+ offsetof(struct pt_regs, r9),
+ offsetof(struct pt_regs, r10),
+ offsetof(struct pt_regs, r11),
+ offsetof(struct pt_regs, r12),
+ offsetof(struct pt_regs, r13),
+ offsetof(struct pt_regs, r14),
+ offsetof(struct pt_regs, r15),
+#endif
+};
+
+int pt_regs_offset(struct pt_regs *regs, int regno)
{
+ if ((unsigned)regno < ARRAY_SIZE(pt_regoff))
+ return pt_regoff[regno];
+ return -EDOM;
+}
+
+static int get_regno(struct insn *insn, enum reg_type type)
+{
+ int nr_registers = ARRAY_SIZE(pt_regoff);
int regno = 0;

- static const int regoff[] = {
- offsetof(struct pt_regs, ax),
- offsetof(struct pt_regs, cx),
- offsetof(struct pt_regs, dx),
- offsetof(struct pt_regs, bx),
- offsetof(struct pt_regs, sp),
- offsetof(struct pt_regs, bp),
- offsetof(struct pt_regs, si),
- offsetof(struct pt_regs, di),
-#ifdef CONFIG_X86_64
- offsetof(struct pt_regs, r8),
- offsetof(struct pt_regs, r9),
- offsetof(struct pt_regs, r10),
- offsetof(struct pt_regs, r11),
- offsetof(struct pt_regs, r12),
- offsetof(struct pt_regs, r13),
- offsetof(struct pt_regs, r14),
- offsetof(struct pt_regs, r15),
-#endif
- };
- int nr_registers = ARRAY_SIZE(regoff);
/*
* Don't possibly decode a 32-bit instructions as
* reading a 64-bit-only register.
@@ -505,7 +512,18 @@ static int get_reg_offset(struct insn *i
WARN_ONCE(1, "decoded an instruction with an invalid register");
return -EINVAL;
}
- return regoff[regno];
+ return regno;
+}
+
+static int get_reg_offset(struct insn *insn, struct pt_regs *regs,
+ enum reg_type type)
+{
+ int regno = get_regno(insn, type);
+
+ if (regno < 0)
+ return regno;
+
+ return pt_regs_offset(regs, regno);
}

/**
--- a/arch/x86/mm/extable.c
+++ b/arch/x86/mm/extable.c
@@ -2,12 +2,25 @@
#include <linux/extable.h>
#include <linux/uaccess.h>
#include <linux/sched/debug.h>
+#include <linux/bitfield.h>
#include <xen/xen.h>

#include <asm/fpu/api.h>
#include <asm/sev.h>
#include <asm/traps.h>
#include <asm/kdebug.h>
+#include <asm/insn-eval.h>
+
+static inline unsigned long *pt_regs_nr(struct pt_regs *regs, int nr)
+{
+ int reg_offset = pt_regs_offset(regs, nr);
+ static unsigned long __dummy;
+
+ if (WARN_ON_ONCE(reg_offset < 0))
+ return &__dummy;
+
+ return (unsigned long *)((unsigned long)regs + reg_offset);
+}

static inline unsigned long
ex_fixup_addr(const struct exception_table_entry *x)
@@ -15,10 +28,15 @@ ex_fixup_addr(const struct exception_tab
return (unsigned long)&x->fixup + x->fixup;
}

-static bool ex_handler_default(const struct exception_table_entry *fixup,
+static bool ex_handler_default(const struct exception_table_entry *e,
struct pt_regs *regs)
{
- regs->ip = ex_fixup_addr(fixup);
+ if (e->data & EX_FLAG_CLEAR_AX)
+ regs->ax = 0;
+ if (e->data & EX_FLAG_CLEAR_DX)
+ regs->dx = 0;
+
+ regs->ip = ex_fixup_addr(e);
return true;
}

@@ -111,17 +129,25 @@ static bool ex_handler_pop_zero(const st
return ex_handler_default(fixup, regs);
}

+static bool ex_handler_imm_reg(const struct exception_table_entry *fixup,
+ struct pt_regs *regs, int reg, int imm)
+{
+ *pt_regs_nr(regs, reg) = (long)imm;
+ return ex_handler_default(fixup, regs);
+}
+
int ex_get_fixup_type(unsigned long ip)
{
const struct exception_table_entry *e = search_exception_tables(ip);

- return e ? e->type : EX_TYPE_NONE;
+ return e ? FIELD_GET(EX_DATA_TYPE_MASK, e->data) : EX_TYPE_NONE;
}

int fixup_exception(struct pt_regs *regs, int trapnr, unsigned long error_code,
unsigned long fault_addr)
{
const struct exception_table_entry *e;
+ int type, reg, imm;

#ifdef CONFIG_PNPBIOS
if (unlikely(SEGMENT_IS_PNP_CODE(regs->cs))) {
@@ -141,7 +167,11 @@ int fixup_exception(struct pt_regs *regs
if (!e)
return 0;

- switch (e->type) {
+ type = FIELD_GET(EX_DATA_TYPE_MASK, e->data);
+ reg = FIELD_GET(EX_DATA_REG_MASK, e->data);
+ imm = FIELD_GET(EX_DATA_IMM_MASK, e->data);
+
+ switch (type) {
case EX_TYPE_DEFAULT:
case EX_TYPE_DEFAULT_MCE_SAFE:
return ex_handler_default(e, regs);
@@ -170,6 +200,8 @@ int fixup_exception(struct pt_regs *regs
break;
case EX_TYPE_POP_ZERO:
return ex_handler_pop_zero(e, regs);
+ case EX_TYPE_IMM_REG:
+ return ex_handler_imm_reg(e, regs, reg, imm);
}
BUG();
}
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -1286,7 +1286,7 @@ st: if (is_imm8(insn->off))
}
ex->insn = delta;

- ex->type = EX_TYPE_BPF;
+ ex->data = EX_TYPE_BPF;

if (dst_reg > BPF_REG_9) {
pr_err("verifier error\n");