mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 21:38:32 +08:00
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 uprobe/kprobe fixes from Ingo Molnar: "This contains two uprobes fixes, an uprobes comment update and a kprobes fix" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: kprobes/x86: Mark 2 bytes NOP as boostable uprobes/x86: Fix 2-byte opcode table uprobes/x86: Fix 1-byte opcode tables uprobes/x86: Add comment with insn opcodes, mnemonics and why we dont support them
This commit is contained in:
Linus Torvalds
commit
b5aeca54d0
@ -84,7 +84,7 @@ static volatile u32 twobyte_is_boostable[256 / 32] = {
|
||||
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
|
||||
/* ---------------------------------------------- */
|
||||
W(0x00, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0) | /* 00 */
|
||||
W(0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) , /* 10 */
|
||||
W(0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1) , /* 10 */
|
||||
W(0x20, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) | /* 20 */
|
||||
W(0x30, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) , /* 30 */
|
||||
W(0x40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* 40 */
|
||||
|
||||
@ -66,27 +66,54 @@
|
||||
* Good-instruction tables for 32-bit apps. This is non-const and volatile
|
||||
* to keep gcc from statically optimizing it out, as variable_test_bit makes
|
||||
* some versions of gcc to think only *(unsigned long*) is used.
|
||||
*
|
||||
* Opcodes we'll probably never support:
|
||||
* 6c-6f - ins,outs. SEGVs if used in userspace
|
||||
* e4-e7 - in,out imm. SEGVs if used in userspace
|
||||
* ec-ef - in,out acc. SEGVs if used in userspace
|
||||
* cc - int3. SIGTRAP if used in userspace
|
||||
* ce - into. Not used in userspace - no kernel support to make it useful. SEGVs
|
||||
* (why we support bound (62) then? it's similar, and similarly unused...)
|
||||
* f1 - int1. SIGTRAP if used in userspace
|
||||
* f4 - hlt. SEGVs if used in userspace
|
||||
* fa - cli. SEGVs if used in userspace
|
||||
* fb - sti. SEGVs if used in userspace
|
||||
*
|
||||
* Opcodes which need some work to be supported:
|
||||
* 07,17,1f - pop es/ss/ds
|
||||
* Normally not used in userspace, but would execute if used.
|
||||
* Can cause GP or stack exception if tries to load wrong segment descriptor.
|
||||
* We hesitate to run them under single step since kernel's handling
|
||||
* of userspace single-stepping (TF flag) is fragile.
|
||||
* We can easily refuse to support push es/cs/ss/ds (06/0e/16/1e)
|
||||
* on the same grounds that they are never used.
|
||||
* cd - int N.
|
||||
* Used by userspace for "int 80" syscall entry. (Other "int N"
|
||||
* cause GP -> SEGV since their IDT gates don't allow calls from CPL 3).
|
||||
* Not supported since kernel's handling of userspace single-stepping
|
||||
* (TF flag) is fragile.
|
||||
* cf - iret. Normally not used in userspace. Doesn't SEGV unless arguments are bad
|
||||
*/
|
||||
#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
|
||||
static volatile u32 good_insns_32[256 / 32] = {
|
||||
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
|
||||
/* ---------------------------------------------- */
|
||||
W(0x00, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0) | /* 00 */
|
||||
W(0x00, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1) | /* 00 */
|
||||
W(0x10, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0) , /* 10 */
|
||||
W(0x20, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1) | /* 20 */
|
||||
W(0x30, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1) , /* 30 */
|
||||
W(0x20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* 20 */
|
||||
W(0x30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* 30 */
|
||||
W(0x40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* 40 */
|
||||
W(0x50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* 50 */
|
||||
W(0x60, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0) | /* 60 */
|
||||
W(0x60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0) | /* 60 */
|
||||
W(0x70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* 70 */
|
||||
W(0x80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* 80 */
|
||||
W(0x90, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* 90 */
|
||||
W(0xa0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* a0 */
|
||||
W(0xb0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* b0 */
|
||||
W(0xc0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0) | /* c0 */
|
||||
W(0xd0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* d0 */
|
||||
W(0xd0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* d0 */
|
||||
W(0xe0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0) | /* e0 */
|
||||
W(0xf0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1) /* f0 */
|
||||
W(0xf0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1) /* f0 */
|
||||
/* ---------------------------------------------- */
|
||||
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
|
||||
};
|
||||
@ -94,27 +121,61 @@ static volatile u32 good_insns_32[256 / 32] = {
|
||||
#define good_insns_32 NULL
|
||||
#endif
|
||||
|
||||
/* Good-instruction tables for 64-bit apps */
|
||||
/* Good-instruction tables for 64-bit apps.
|
||||
*
|
||||
* Genuinely invalid opcodes:
|
||||
* 06,07 - formerly push/pop es
|
||||
* 0e - formerly push cs
|
||||
* 16,17 - formerly push/pop ss
|
||||
* 1e,1f - formerly push/pop ds
|
||||
* 27,2f,37,3f - formerly daa/das/aaa/aas
|
||||
* 60,61 - formerly pusha/popa
|
||||
* 62 - formerly bound. EVEX prefix for AVX512 (not yet supported)
|
||||
* 82 - formerly redundant encoding of Group1
|
||||
* 9a - formerly call seg:ofs
|
||||
* ce - formerly into
|
||||
* d4,d5 - formerly aam/aad
|
||||
* d6 - formerly undocumented salc
|
||||
* ea - formerly jmp seg:ofs
|
||||
*
|
||||
* Opcodes we'll probably never support:
|
||||
* 6c-6f - ins,outs. SEGVs if used in userspace
|
||||
* e4-e7 - in,out imm. SEGVs if used in userspace
|
||||
* ec-ef - in,out acc. SEGVs if used in userspace
|
||||
* cc - int3. SIGTRAP if used in userspace
|
||||
* f1 - int1. SIGTRAP if used in userspace
|
||||
* f4 - hlt. SEGVs if used in userspace
|
||||
* fa - cli. SEGVs if used in userspace
|
||||
* fb - sti. SEGVs if used in userspace
|
||||
*
|
||||
* Opcodes which need some work to be supported:
|
||||
* cd - int N.
|
||||
* Used by userspace for "int 80" syscall entry. (Other "int N"
|
||||
* cause GP -> SEGV since their IDT gates don't allow calls from CPL 3).
|
||||
* Not supported since kernel's handling of userspace single-stepping
|
||||
* (TF flag) is fragile.
|
||||
* cf - iret. Normally not used in userspace. Doesn't SEGV unless arguments are bad
|
||||
*/
|
||||
#if defined(CONFIG_X86_64)
|
||||
static volatile u32 good_insns_64[256 / 32] = {
|
||||
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
|
||||
/* ---------------------------------------------- */
|
||||
W(0x00, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0) | /* 00 */
|
||||
W(0x00, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1) | /* 00 */
|
||||
W(0x10, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0) , /* 10 */
|
||||
W(0x20, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0) | /* 20 */
|
||||
W(0x30, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0) , /* 30 */
|
||||
W(0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) | /* 40 */
|
||||
W(0x20, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0) | /* 20 */
|
||||
W(0x30, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0) , /* 30 */
|
||||
W(0x40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* 40 */
|
||||
W(0x50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* 50 */
|
||||
W(0x60, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0) | /* 60 */
|
||||
W(0x60, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0) | /* 60 */
|
||||
W(0x70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* 70 */
|
||||
W(0x80, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* 80 */
|
||||
W(0x90, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* 90 */
|
||||
W(0x90, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1) , /* 90 */
|
||||
W(0xa0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* a0 */
|
||||
W(0xb0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* b0 */
|
||||
W(0xc0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0) | /* c0 */
|
||||
W(0xc0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0) | /* c0 */
|
||||
W(0xd0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* d0 */
|
||||
W(0xe0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0) | /* e0 */
|
||||
W(0xf0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1) /* f0 */
|
||||
W(0xe0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0) | /* e0 */
|
||||
W(0xf0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1) /* f0 */
|
||||
/* ---------------------------------------------- */
|
||||
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
|
||||
};
|
||||
@ -122,49 +183,55 @@ static volatile u32 good_insns_64[256 / 32] = {
|
||||
#define good_insns_64 NULL
|
||||
#endif
|
||||
|
||||
/* Using this for both 64-bit and 32-bit apps */
|
||||
/* Using this for both 64-bit and 32-bit apps.
|
||||
* Opcodes we don't support:
|
||||
* 0f 00 - SLDT/STR/LLDT/LTR/VERR/VERW/-/- group. System insns
|
||||
* 0f 01 - SGDT/SIDT/LGDT/LIDT/SMSW/-/LMSW/INVLPG group.
|
||||
* Also encodes tons of other system insns if mod=11.
|
||||
* Some are in fact non-system: xend, xtest, rdtscp, maybe more
|
||||
* 0f 05 - syscall
|
||||
* 0f 06 - clts (CPL0 insn)
|
||||
* 0f 07 - sysret
|
||||
* 0f 08 - invd (CPL0 insn)
|
||||
* 0f 09 - wbinvd (CPL0 insn)
|
||||
* 0f 0b - ud2
|
||||
* 0f 30 - wrmsr (CPL0 insn) (then why rdmsr is allowed, it's also CPL0 insn?)
|
||||
* 0f 34 - sysenter
|
||||
* 0f 35 - sysexit
|
||||
* 0f 37 - getsec
|
||||
* 0f 78 - vmread (Intel VMX. CPL0 insn)
|
||||
* 0f 79 - vmwrite (Intel VMX. CPL0 insn)
|
||||
* Note: with prefixes, these two opcodes are
|
||||
* extrq/insertq/AVX512 convert vector ops.
|
||||
* 0f ae - group15: [f]xsave,[f]xrstor,[v]{ld,st}mxcsr,clflush[opt],
|
||||
* {rd,wr}{fs,gs}base,{s,l,m}fence.
|
||||
* Why? They are all user-executable.
|
||||
*/
|
||||
static volatile u32 good_2byte_insns[256 / 32] = {
|
||||
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
|
||||
/* ---------------------------------------------- */
|
||||
W(0x00, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1) | /* 00 */
|
||||
W(0x10, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1) , /* 10 */
|
||||
W(0x20, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1) | /* 20 */
|
||||
W(0x30, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) , /* 30 */
|
||||
W(0x00, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1) | /* 00 */
|
||||
W(0x10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* 10 */
|
||||
W(0x20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* 20 */
|
||||
W(0x30, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1) , /* 30 */
|
||||
W(0x40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* 40 */
|
||||
W(0x50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* 50 */
|
||||
W(0x60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* 60 */
|
||||
W(0x70, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1) , /* 70 */
|
||||
W(0x70, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1) , /* 70 */
|
||||
W(0x80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* 80 */
|
||||
W(0x90, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* 90 */
|
||||
W(0xa0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1) | /* a0 */
|
||||
W(0xb0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1) , /* b0 */
|
||||
W(0xa0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1) | /* a0 */
|
||||
W(0xb0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* b0 */
|
||||
W(0xc0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* c0 */
|
||||
W(0xd0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* d0 */
|
||||
W(0xd0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) , /* d0 */
|
||||
W(0xe0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) | /* e0 */
|
||||
W(0xf0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0) /* f0 */
|
||||
W(0xf0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) /* f0 */
|
||||
/* ---------------------------------------------- */
|
||||
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
|
||||
};
|
||||
#undef W
|
||||
|
||||
/*
|
||||
* opcodes we'll probably never support:
|
||||
*
|
||||
* 6c-6d, e4-e5, ec-ed - in
|
||||
* 6e-6f, e6-e7, ee-ef - out
|
||||
* cc, cd - int3, int
|
||||
* cf - iret
|
||||
* d6 - illegal instruction
|
||||
* f1 - int1/icebp
|
||||
* f4 - hlt
|
||||
* fa, fb - cli, sti
|
||||
* 0f - lar, lsl, syscall, clts, sysret, sysenter, sysexit, invd, wbinvd, ud2
|
||||
*
|
||||
* invalid opcodes in 64-bit mode:
|
||||
*
|
||||
* 06, 0e, 16, 1e, 27, 2f, 37, 3f, 60-62, 82, c4-c5, d4-d5
|
||||
* 63 - we support this opcode in x86_64 but not in i386.
|
||||
*
|
||||
* opcodes we may need to refine support for:
|
||||
*
|
||||
* 0f - 2-byte instructions: For many of these instructions, the validity
|
||||
|
||||
Loading…
Reference in New Issue
Block a user