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uprobes/core: Clean up, refactor and improve the code
Make the uprobes code readable to me: - improve the Kconfig text so that a mere mortal gets some idea what CONFIG_UPROBES=y is really about - do trivial renames to standardize around the uprobes_*() namespace - clean up and simplify various code flow details - separate basic blocks of functionality - line break artifact and white space related removal - use standard local varible definition blocks - use vertical spacing to make things more readable - remove unnecessary volatile - restructure comment blocks to make them more uniform and more readable in general Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Arnaldo Carvalho de Melo <acme@infradead.org> Cc: Anton Arapov <anton@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Link: http://lkml.kernel.org/n/tip-ewbwhb8o6navvllsauu7k07p@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
parent
2b14449835
commit
7b2d81d48a
14
arch/Kconfig
14
arch/Kconfig
@ -66,13 +66,19 @@ config OPTPROBES
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depends on !PREEMPT
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config UPROBES
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bool "User-space probes (EXPERIMENTAL)"
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bool "Transparent user-space probes (EXPERIMENTAL)"
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depends on ARCH_SUPPORTS_UPROBES
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default n
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help
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Uprobes enables kernel subsystems to establish probepoints
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in user applications and execute handler functions when
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the probepoints are hit.
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Uprobes is the user-space counterpart to kprobes: they
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enable instrumentation applications (such as 'perf probe')
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to establish unintrusive probes in user-space binaries and
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libraries, by executing handler functions when the probes
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are hit by user-space applications.
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( These probes come in the form of single-byte breakpoints,
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managed by the kernel and kept transparent to the probed
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application. )
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If in doubt, say "N".
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@ -1,7 +1,7 @@
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#ifndef _ASM_UPROBES_H
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#define _ASM_UPROBES_H
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/*
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* Userspace Probes (UProbes) for x86
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* User-space Probes (UProbes) for x86
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -24,19 +24,20 @@
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*/
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typedef u8 uprobe_opcode_t;
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#define MAX_UINSN_BYTES 16
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#define UPROBES_XOL_SLOT_BYTES 128 /* to keep it cache aligned */
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#define UPROBES_BKPT_INSN 0xcc
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#define UPROBES_BKPT_INSN_SIZE 1
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#define MAX_UINSN_BYTES 16
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#define UPROBES_XOL_SLOT_BYTES 128 /* to keep it cache aligned */
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#define UPROBES_BKPT_INSN 0xcc
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#define UPROBES_BKPT_INSN_SIZE 1
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struct uprobe_arch_info {
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u16 fixups;
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u16 fixups;
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#ifdef CONFIG_X86_64
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unsigned long rip_rela_target_address;
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unsigned long rip_rela_target_address;
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#endif
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};
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struct uprobe;
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extern int analyze_insn(struct mm_struct *mm, struct uprobe *uprobe);
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extern int arch_uprobes_analyze_insn(struct mm_struct *mm, struct uprobe *uprobe);
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#endif /* _ASM_UPROBES_H */
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@ -1,5 +1,5 @@
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/*
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* Userspace Probes (UProbes) for x86
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* User-space Probes (UProbes) for x86
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -20,7 +20,6 @@
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* Srikar Dronamraju
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* Jim Keniston
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/ptrace.h>
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@ -42,10 +41,10 @@
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#define UPROBES_FIX_RIP_CX 0x4000
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/* Adaptations for mhiramat x86 decoder v14. */
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#define OPCODE1(insn) ((insn)->opcode.bytes[0])
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#define OPCODE2(insn) ((insn)->opcode.bytes[1])
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#define OPCODE3(insn) ((insn)->opcode.bytes[2])
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#define MODRM_REG(insn) X86_MODRM_REG(insn->modrm.value)
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#define OPCODE1(insn) ((insn)->opcode.bytes[0])
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#define OPCODE2(insn) ((insn)->opcode.bytes[1])
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#define OPCODE3(insn) ((insn)->opcode.bytes[2])
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#define MODRM_REG(insn) X86_MODRM_REG(insn->modrm.value)
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#define W(row, b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, ba, bb, bc, bd, be, bf)\
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(((b0##UL << 0x0)|(b1##UL << 0x1)|(b2##UL << 0x2)|(b3##UL << 0x3) | \
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@ -55,7 +54,7 @@
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<< (row % 32))
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#ifdef CONFIG_X86_64
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static volatile u32 good_insns_64[256 / 32] = {
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static u32 good_insns_64[256 / 32] = {
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/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
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/* ---------------------------------------------- */
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W(0x00, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0) | /* 00 */
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@ -81,7 +80,7 @@ static volatile u32 good_insns_64[256 / 32] = {
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/* Good-instruction tables for 32-bit apps */
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static volatile u32 good_insns_32[256 / 32] = {
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static u32 good_insns_32[256 / 32] = {
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/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
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/* ---------------------------------------------- */
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W(0x00, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0) | /* 00 */
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@ -105,7 +104,7 @@ static volatile u32 good_insns_32[256 / 32] = {
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};
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/* Using this for both 64-bit and 32-bit apps */
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static volatile u32 good_2byte_insns[256 / 32] = {
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static u32 good_2byte_insns[256 / 32] = {
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/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
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/* ---------------------------------------------- */
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W(0x00, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1) | /* 00 */
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@ -132,42 +131,47 @@ static volatile u32 good_2byte_insns[256 / 32] = {
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/*
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* opcodes we'll probably never support:
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* 6c-6d, e4-e5, ec-ed - in
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* 6e-6f, e6-e7, ee-ef - out
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* cc, cd - int3, int
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* cf - iret
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* d6 - illegal instruction
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* f1 - int1/icebp
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* f4 - hlt
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* fa, fb - cli, sti
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* 0f - lar, lsl, syscall, clts, sysret, sysenter, sysexit, invd, wbinvd, ud2
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*
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* 6c-6d, e4-e5, ec-ed - in
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* 6e-6f, e6-e7, ee-ef - out
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* cc, cd - int3, int
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* cf - iret
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* d6 - illegal instruction
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* f1 - int1/icebp
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* f4 - hlt
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* fa, fb - cli, sti
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* 0f - lar, lsl, syscall, clts, sysret, sysenter, sysexit, invd, wbinvd, ud2
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*
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* invalid opcodes in 64-bit mode:
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* 06, 0e, 16, 1e, 27, 2f, 37, 3f, 60-62, 82, c4-c5, d4-d5
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*
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* 63 - we support this opcode in x86_64 but not in i386.
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* 06, 0e, 16, 1e, 27, 2f, 37, 3f, 60-62, 82, c4-c5, d4-d5
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* 63 - we support this opcode in x86_64 but not in i386.
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*
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* opcodes we may need to refine support for:
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* 0f - 2-byte instructions: For many of these instructions, the validity
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* depends on the prefix and/or the reg field. On such instructions, we
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* just consider the opcode combination valid if it corresponds to any
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* valid instruction.
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* 8f - Group 1 - only reg = 0 is OK
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* c6-c7 - Group 11 - only reg = 0 is OK
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* d9-df - fpu insns with some illegal encodings
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* f2, f3 - repnz, repz prefixes. These are also the first byte for
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* certain floating-point instructions, such as addsd.
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* fe - Group 4 - only reg = 0 or 1 is OK
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* ff - Group 5 - only reg = 0-6 is OK
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*
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* 0f - 2-byte instructions: For many of these instructions, the validity
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* depends on the prefix and/or the reg field. On such instructions, we
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* just consider the opcode combination valid if it corresponds to any
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* valid instruction.
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*
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* 8f - Group 1 - only reg = 0 is OK
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* c6-c7 - Group 11 - only reg = 0 is OK
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* d9-df - fpu insns with some illegal encodings
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* f2, f3 - repnz, repz prefixes. These are also the first byte for
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* certain floating-point instructions, such as addsd.
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*
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* fe - Group 4 - only reg = 0 or 1 is OK
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* ff - Group 5 - only reg = 0-6 is OK
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*
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* others -- Do we need to support these?
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* 0f - (floating-point?) prefetch instructions
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* 07, 17, 1f - pop es, pop ss, pop ds
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* 26, 2e, 36, 3e - es:, cs:, ss:, ds: segment prefixes --
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*
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* 0f - (floating-point?) prefetch instructions
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* 07, 17, 1f - pop es, pop ss, pop ds
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* 26, 2e, 36, 3e - es:, cs:, ss:, ds: segment prefixes --
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* but 64 and 65 (fs: and gs:) seem to be used, so we support them
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* 67 - addr16 prefix
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* ce - into
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* f0 - lock prefix
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* 67 - addr16 prefix
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* ce - into
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* f0 - lock prefix
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*/
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/*
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@ -182,11 +186,11 @@ static bool is_prefix_bad(struct insn *insn)
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for (i = 0; i < insn->prefixes.nbytes; i++) {
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switch (insn->prefixes.bytes[i]) {
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case 0x26: /*INAT_PFX_ES */
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case 0x2E: /*INAT_PFX_CS */
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case 0x36: /*INAT_PFX_DS */
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case 0x3E: /*INAT_PFX_SS */
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case 0xF0: /*INAT_PFX_LOCK */
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case 0x26: /* INAT_PFX_ES */
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case 0x2E: /* INAT_PFX_CS */
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case 0x36: /* INAT_PFX_DS */
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case 0x3E: /* INAT_PFX_SS */
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case 0xF0: /* INAT_PFX_LOCK */
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return true;
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}
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}
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@ -201,12 +205,15 @@ static int validate_insn_32bits(struct uprobe *uprobe, struct insn *insn)
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insn_get_opcode(insn);
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if (is_prefix_bad(insn))
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return -ENOTSUPP;
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if (test_bit(OPCODE1(insn), (unsigned long *)good_insns_32))
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return 0;
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if (insn->opcode.nbytes == 2) {
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if (test_bit(OPCODE2(insn), (unsigned long *)good_2byte_insns))
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return 0;
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}
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return -ENOTSUPP;
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}
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@ -282,12 +289,12 @@ static void prepare_fixups(struct uprobe *uprobe, struct insn *insn)
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* disastrous.
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*
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* Some useful facts about rip-relative instructions:
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* - There's always a modrm byte.
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* - There's never a SIB byte.
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* - The displacement is always 4 bytes.
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*
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* - There's always a modrm byte.
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* - There's never a SIB byte.
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* - The displacement is always 4 bytes.
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*/
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static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe,
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struct insn *insn)
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static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe, struct insn *insn)
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{
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u8 *cursor;
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u8 reg;
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@ -342,13 +349,12 @@ static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe,
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}
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/* Target address = address of next instruction + (signed) offset */
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uprobe->arch_info.rip_rela_target_address = (long)insn->length
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+ insn->displacement.value;
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uprobe->arch_info.rip_rela_target_address = (long)insn->length + insn->displacement.value;
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/* Displacement field is gone; slide immediate field (if any) over. */
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if (insn->immediate.nbytes) {
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cursor++;
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memmove(cursor, cursor + insn->displacement.nbytes,
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insn->immediate.nbytes);
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memmove(cursor, cursor + insn->displacement.nbytes, insn->immediate.nbytes);
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}
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return;
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}
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@ -361,8 +367,10 @@ static int validate_insn_64bits(struct uprobe *uprobe, struct insn *insn)
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insn_get_opcode(insn);
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if (is_prefix_bad(insn))
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return -ENOTSUPP;
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if (test_bit(OPCODE1(insn), (unsigned long *)good_insns_64))
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return 0;
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if (insn->opcode.nbytes == 2) {
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if (test_bit(OPCODE2(insn), (unsigned long *)good_2byte_insns))
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return 0;
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@ -370,34 +378,31 @@ static int validate_insn_64bits(struct uprobe *uprobe, struct insn *insn)
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return -ENOTSUPP;
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}
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static int validate_insn_bits(struct mm_struct *mm, struct uprobe *uprobe,
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struct insn *insn)
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static int validate_insn_bits(struct mm_struct *mm, struct uprobe *uprobe, struct insn *insn)
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{
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if (mm->context.ia32_compat)
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return validate_insn_32bits(uprobe, insn);
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return validate_insn_64bits(uprobe, insn);
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}
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#else
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static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe,
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struct insn *insn)
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#else /* 32-bit: */
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static void handle_riprel_insn(struct mm_struct *mm, struct uprobe *uprobe, struct insn *insn)
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{
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return;
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/* No RIP-relative addressing on 32-bit */
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}
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static int validate_insn_bits(struct mm_struct *mm, struct uprobe *uprobe,
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struct insn *insn)
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static int validate_insn_bits(struct mm_struct *mm, struct uprobe *uprobe, struct insn *insn)
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{
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return validate_insn_32bits(uprobe, insn);
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}
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#endif /* CONFIG_X86_64 */
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/**
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* analyze_insn - instruction analysis including validity and fixups.
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* arch_uprobes_analyze_insn - instruction analysis including validity and fixups.
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* @mm: the probed address space.
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* @uprobe: the probepoint information.
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* Return 0 on success or a -ve number on error.
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*/
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int analyze_insn(struct mm_struct *mm, struct uprobe *uprobe)
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int arch_uprobes_analyze_insn(struct mm_struct *mm, struct uprobe *uprobe)
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{
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int ret;
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struct insn insn;
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@ -406,7 +411,9 @@ int analyze_insn(struct mm_struct *mm, struct uprobe *uprobe)
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ret = validate_insn_bits(mm, uprobe, &insn);
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if (ret != 0)
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return ret;
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handle_riprel_insn(mm, uprobe, &insn);
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prepare_fixups(uprobe, &insn);
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return 0;
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}
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@ -1,7 +1,7 @@
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#ifndef _LINUX_UPROBES_H
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#define _LINUX_UPROBES_H
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/*
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* Userspace Probes (UProbes)
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* User-space Probes (UProbes)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -40,8 +40,10 @@ struct uprobe_arch_info {};
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#define uprobe_opcode_sz sizeof(uprobe_opcode_t)
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/* flags that denote/change uprobes behaviour */
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/* Have a copy of original instruction */
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#define UPROBES_COPY_INSN 0x1
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/* Dont run handlers when first register/ last unregister in progress*/
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#define UPROBES_RUN_HANDLER 0x2
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@ -70,27 +72,23 @@ struct uprobe {
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};
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#ifdef CONFIG_UPROBES
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extern int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe,
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unsigned long vaddr);
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extern int __weak set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe,
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unsigned long vaddr, bool verify);
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extern int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr);
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extern int __weak set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr, bool verify);
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extern bool __weak is_bkpt_insn(uprobe_opcode_t *insn);
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extern int register_uprobe(struct inode *inode, loff_t offset,
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struct uprobe_consumer *consumer);
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extern void unregister_uprobe(struct inode *inode, loff_t offset,
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struct uprobe_consumer *consumer);
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extern int mmap_uprobe(struct vm_area_struct *vma);
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extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer);
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extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer);
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extern int uprobe_mmap(struct vm_area_struct *vma);
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#else /* CONFIG_UPROBES is not defined */
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static inline int register_uprobe(struct inode *inode, loff_t offset,
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struct uprobe_consumer *consumer)
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static inline int
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uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer)
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{
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return -ENOSYS;
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}
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static inline void unregister_uprobe(struct inode *inode, loff_t offset,
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struct uprobe_consumer *consumer)
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static inline void
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uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer)
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{
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}
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static inline int mmap_uprobe(struct vm_area_struct *vma)
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static inline int uprobe_mmap(struct vm_area_struct *vma)
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{
|
||||
return 0;
|
||||
}
|
||||
|
||||
219
kernel/uprobes.c
219
kernel/uprobes.c
@ -1,5 +1,5 @@
|
||||
/*
|
||||
* Userspace Probes (UProbes)
|
||||
* User-space Probes (UProbes)
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
@ -29,24 +29,26 @@
|
||||
#include <linux/rmap.h> /* anon_vma_prepare */
|
||||
#include <linux/mmu_notifier.h> /* set_pte_at_notify */
|
||||
#include <linux/swap.h> /* try_to_free_swap */
|
||||
|
||||
#include <linux/uprobes.h>
|
||||
|
||||
static struct rb_root uprobes_tree = RB_ROOT;
|
||||
|
||||
static DEFINE_SPINLOCK(uprobes_treelock); /* serialize rbtree access */
|
||||
|
||||
#define UPROBES_HASH_SZ 13
|
||||
|
||||
/* serialize (un)register */
|
||||
static struct mutex uprobes_mutex[UPROBES_HASH_SZ];
|
||||
#define uprobes_hash(v) (&uprobes_mutex[((unsigned long)(v)) %\
|
||||
UPROBES_HASH_SZ])
|
||||
|
||||
#define uprobes_hash(v) (&uprobes_mutex[((unsigned long)(v)) % UPROBES_HASH_SZ])
|
||||
|
||||
/* serialize uprobe->pending_list */
|
||||
static struct mutex uprobes_mmap_mutex[UPROBES_HASH_SZ];
|
||||
#define uprobes_mmap_hash(v) (&uprobes_mmap_mutex[((unsigned long)(v)) %\
|
||||
UPROBES_HASH_SZ])
|
||||
#define uprobes_mmap_hash(v) (&uprobes_mmap_mutex[((unsigned long)(v)) % UPROBES_HASH_SZ])
|
||||
|
||||
/*
|
||||
* uprobe_events allows us to skip the mmap_uprobe if there are no uprobe
|
||||
* uprobe_events allows us to skip the uprobe_mmap if there are no uprobe
|
||||
* events active at this time. Probably a fine grained per inode count is
|
||||
* better?
|
||||
*/
|
||||
@ -58,9 +60,9 @@ static atomic_t uprobe_events = ATOMIC_INIT(0);
|
||||
* vm_area_struct wasnt recommended.
|
||||
*/
|
||||
struct vma_info {
|
||||
struct list_head probe_list;
|
||||
struct mm_struct *mm;
|
||||
loff_t vaddr;
|
||||
struct list_head probe_list;
|
||||
struct mm_struct *mm;
|
||||
loff_t vaddr;
|
||||
};
|
||||
|
||||
/*
|
||||
@ -79,8 +81,7 @@ static bool valid_vma(struct vm_area_struct *vma, bool is_register)
|
||||
if (!is_register)
|
||||
return true;
|
||||
|
||||
if ((vma->vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)) ==
|
||||
(VM_READ|VM_EXEC))
|
||||
if ((vma->vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)) == (VM_READ|VM_EXEC))
|
||||
return true;
|
||||
|
||||
return false;
|
||||
@ -92,6 +93,7 @@ static loff_t vma_address(struct vm_area_struct *vma, loff_t offset)
|
||||
|
||||
vaddr = vma->vm_start + offset;
|
||||
vaddr -= vma->vm_pgoff << PAGE_SHIFT;
|
||||
|
||||
return vaddr;
|
||||
}
|
||||
|
||||
@ -105,8 +107,7 @@ static loff_t vma_address(struct vm_area_struct *vma, loff_t offset)
|
||||
*
|
||||
* Returns 0 on success, -EFAULT on failure.
|
||||
*/
|
||||
static int __replace_page(struct vm_area_struct *vma, struct page *page,
|
||||
struct page *kpage)
|
||||
static int __replace_page(struct vm_area_struct *vma, struct page *page, struct page *kpage)
|
||||
{
|
||||
struct mm_struct *mm = vma->vm_mm;
|
||||
pgd_t *pgd;
|
||||
@ -163,7 +164,7 @@ static int __replace_page(struct vm_area_struct *vma, struct page *page,
|
||||
*/
|
||||
bool __weak is_bkpt_insn(uprobe_opcode_t *insn)
|
||||
{
|
||||
return (*insn == UPROBES_BKPT_INSN);
|
||||
return *insn == UPROBES_BKPT_INSN;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -203,6 +204,7 @@ static int write_opcode(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
ret = get_user_pages(NULL, mm, vaddr, 1, 0, 0, &old_page, &vma);
|
||||
if (ret <= 0)
|
||||
return ret;
|
||||
|
||||
ret = -EINVAL;
|
||||
|
||||
/*
|
||||
@ -239,6 +241,7 @@ static int write_opcode(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
vaddr_new = kmap_atomic(new_page);
|
||||
|
||||
memcpy(vaddr_new, vaddr_old, PAGE_SIZE);
|
||||
|
||||
/* poke the new insn in, ASSUMES we don't cross page boundary */
|
||||
vaddr &= ~PAGE_MASK;
|
||||
BUG_ON(vaddr + uprobe_opcode_sz > PAGE_SIZE);
|
||||
@ -260,7 +263,8 @@ static int write_opcode(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
page_cache_release(new_page);
|
||||
|
||||
put_out:
|
||||
put_page(old_page); /* we did a get_page in the beginning */
|
||||
put_page(old_page);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
@ -276,8 +280,7 @@ static int write_opcode(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
* For mm @mm, read the opcode at @vaddr and store it in @opcode.
|
||||
* Return 0 (success) or a negative errno.
|
||||
*/
|
||||
static int read_opcode(struct mm_struct *mm, unsigned long vaddr,
|
||||
uprobe_opcode_t *opcode)
|
||||
static int read_opcode(struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t *opcode)
|
||||
{
|
||||
struct page *page;
|
||||
void *vaddr_new;
|
||||
@ -293,15 +296,18 @@ static int read_opcode(struct mm_struct *mm, unsigned long vaddr,
|
||||
memcpy(opcode, vaddr_new + vaddr, uprobe_opcode_sz);
|
||||
kunmap_atomic(vaddr_new);
|
||||
unlock_page(page);
|
||||
put_page(page); /* we did a get_user_pages in the beginning */
|
||||
|
||||
put_page(page);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int is_bkpt_at_addr(struct mm_struct *mm, unsigned long vaddr)
|
||||
{
|
||||
uprobe_opcode_t opcode;
|
||||
int result = read_opcode(mm, vaddr, &opcode);
|
||||
int result;
|
||||
|
||||
result = read_opcode(mm, vaddr, &opcode);
|
||||
if (result)
|
||||
return result;
|
||||
|
||||
@ -320,11 +326,11 @@ static int is_bkpt_at_addr(struct mm_struct *mm, unsigned long vaddr)
|
||||
* For mm @mm, store the breakpoint instruction at @vaddr.
|
||||
* Return 0 (success) or a negative errno.
|
||||
*/
|
||||
int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
unsigned long vaddr)
|
||||
int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr)
|
||||
{
|
||||
int result = is_bkpt_at_addr(mm, vaddr);
|
||||
int result;
|
||||
|
||||
result = is_bkpt_at_addr(mm, vaddr);
|
||||
if (result == 1)
|
||||
return -EEXIST;
|
||||
|
||||
@ -344,35 +350,35 @@ int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
* For mm @mm, restore the original opcode (opcode) at @vaddr.
|
||||
* Return 0 (success) or a negative errno.
|
||||
*/
|
||||
int __weak set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
unsigned long vaddr, bool verify)
|
||||
int __weak
|
||||
set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr, bool verify)
|
||||
{
|
||||
if (verify) {
|
||||
int result = is_bkpt_at_addr(mm, vaddr);
|
||||
int result;
|
||||
|
||||
result = is_bkpt_at_addr(mm, vaddr);
|
||||
if (!result)
|
||||
return -EINVAL;
|
||||
|
||||
if (result != 1)
|
||||
return result;
|
||||
}
|
||||
return write_opcode(mm, uprobe, vaddr,
|
||||
*(uprobe_opcode_t *)uprobe->insn);
|
||||
return write_opcode(mm, uprobe, vaddr, *(uprobe_opcode_t *)uprobe->insn);
|
||||
}
|
||||
|
||||
static int match_uprobe(struct uprobe *l, struct uprobe *r)
|
||||
{
|
||||
if (l->inode < r->inode)
|
||||
return -1;
|
||||
|
||||
if (l->inode > r->inode)
|
||||
return 1;
|
||||
else {
|
||||
if (l->offset < r->offset)
|
||||
return -1;
|
||||
|
||||
if (l->offset > r->offset)
|
||||
return 1;
|
||||
}
|
||||
if (l->offset < r->offset)
|
||||
return -1;
|
||||
|
||||
if (l->offset > r->offset)
|
||||
return 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -391,6 +397,7 @@ static struct uprobe *__find_uprobe(struct inode *inode, loff_t offset)
|
||||
atomic_inc(&uprobe->ref);
|
||||
return uprobe;
|
||||
}
|
||||
|
||||
if (match < 0)
|
||||
n = n->rb_left;
|
||||
else
|
||||
@ -411,6 +418,7 @@ static struct uprobe *find_uprobe(struct inode *inode, loff_t offset)
|
||||
spin_lock_irqsave(&uprobes_treelock, flags);
|
||||
uprobe = __find_uprobe(inode, offset);
|
||||
spin_unlock_irqrestore(&uprobes_treelock, flags);
|
||||
|
||||
return uprobe;
|
||||
}
|
||||
|
||||
@ -436,16 +444,18 @@ static struct uprobe *__insert_uprobe(struct uprobe *uprobe)
|
||||
p = &parent->rb_right;
|
||||
|
||||
}
|
||||
|
||||
u = NULL;
|
||||
rb_link_node(&uprobe->rb_node, parent, p);
|
||||
rb_insert_color(&uprobe->rb_node, &uprobes_tree);
|
||||
/* get access + creation ref */
|
||||
atomic_set(&uprobe->ref, 2);
|
||||
|
||||
return u;
|
||||
}
|
||||
|
||||
/*
|
||||
* Acquires uprobes_treelock.
|
||||
* Acquire uprobes_treelock.
|
||||
* Matching uprobe already exists in rbtree;
|
||||
* increment (access refcount) and return the matching uprobe.
|
||||
*
|
||||
@ -460,6 +470,7 @@ static struct uprobe *insert_uprobe(struct uprobe *uprobe)
|
||||
spin_lock_irqsave(&uprobes_treelock, flags);
|
||||
u = __insert_uprobe(uprobe);
|
||||
spin_unlock_irqrestore(&uprobes_treelock, flags);
|
||||
|
||||
return u;
|
||||
}
|
||||
|
||||
@ -490,19 +501,22 @@ static struct uprobe *alloc_uprobe(struct inode *inode, loff_t offset)
|
||||
kfree(uprobe);
|
||||
uprobe = cur_uprobe;
|
||||
iput(inode);
|
||||
} else
|
||||
} else {
|
||||
atomic_inc(&uprobe_events);
|
||||
}
|
||||
|
||||
return uprobe;
|
||||
}
|
||||
|
||||
/* Returns the previous consumer */
|
||||
static struct uprobe_consumer *add_consumer(struct uprobe *uprobe,
|
||||
struct uprobe_consumer *consumer)
|
||||
static struct uprobe_consumer *
|
||||
consumer_add(struct uprobe *uprobe, struct uprobe_consumer *consumer)
|
||||
{
|
||||
down_write(&uprobe->consumer_rwsem);
|
||||
consumer->next = uprobe->consumers;
|
||||
uprobe->consumers = consumer;
|
||||
up_write(&uprobe->consumer_rwsem);
|
||||
|
||||
return consumer->next;
|
||||
}
|
||||
|
||||
@ -511,8 +525,7 @@ static struct uprobe_consumer *add_consumer(struct uprobe *uprobe,
|
||||
* Return true if the @consumer is deleted successfully
|
||||
* or return false.
|
||||
*/
|
||||
static bool del_consumer(struct uprobe *uprobe,
|
||||
struct uprobe_consumer *consumer)
|
||||
static bool consumer_del(struct uprobe *uprobe, struct uprobe_consumer *consumer)
|
||||
{
|
||||
struct uprobe_consumer **con;
|
||||
bool ret = false;
|
||||
@ -526,6 +539,7 @@ static bool del_consumer(struct uprobe *uprobe,
|
||||
}
|
||||
}
|
||||
up_write(&uprobe->consumer_rwsem);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
@ -557,15 +571,15 @@ static int __copy_insn(struct address_space *mapping,
|
||||
memcpy(insn, vaddr + off1, nbytes);
|
||||
kunmap_atomic(vaddr);
|
||||
page_cache_release(page);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int copy_insn(struct uprobe *uprobe, struct vm_area_struct *vma,
|
||||
unsigned long addr)
|
||||
static int copy_insn(struct uprobe *uprobe, struct vm_area_struct *vma, unsigned long addr)
|
||||
{
|
||||
struct address_space *mapping;
|
||||
int bytes;
|
||||
unsigned long nbytes;
|
||||
int bytes;
|
||||
|
||||
addr &= ~PAGE_MASK;
|
||||
nbytes = PAGE_SIZE - addr;
|
||||
@ -605,6 +619,7 @@ static int install_breakpoint(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
return -EEXIST;
|
||||
|
||||
addr = (unsigned long)vaddr;
|
||||
|
||||
if (!(uprobe->flags & UPROBES_COPY_INSN)) {
|
||||
ret = copy_insn(uprobe, vma, addr);
|
||||
if (ret)
|
||||
@ -613,7 +628,7 @@ static int install_breakpoint(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
if (is_bkpt_insn((uprobe_opcode_t *)uprobe->insn))
|
||||
return -EEXIST;
|
||||
|
||||
ret = analyze_insn(mm, uprobe);
|
||||
ret = arch_uprobes_analyze_insn(mm, uprobe);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
@ -624,8 +639,7 @@ static int install_breakpoint(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void remove_breakpoint(struct mm_struct *mm, struct uprobe *uprobe,
|
||||
loff_t vaddr)
|
||||
static void remove_breakpoint(struct mm_struct *mm, struct uprobe *uprobe, loff_t vaddr)
|
||||
{
|
||||
set_orig_insn(mm, uprobe, (unsigned long)vaddr, true);
|
||||
}
|
||||
@ -649,9 +663,11 @@ static struct vma_info *__find_next_vma_info(struct list_head *head,
|
||||
struct prio_tree_iter iter;
|
||||
struct vm_area_struct *vma;
|
||||
struct vma_info *tmpvi;
|
||||
loff_t vaddr;
|
||||
unsigned long pgoff = offset >> PAGE_SHIFT;
|
||||
unsigned long pgoff;
|
||||
int existing_vma;
|
||||
loff_t vaddr;
|
||||
|
||||
pgoff = offset >> PAGE_SHIFT;
|
||||
|
||||
vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
|
||||
if (!valid_vma(vma, is_register))
|
||||
@ -659,6 +675,7 @@ static struct vma_info *__find_next_vma_info(struct list_head *head,
|
||||
|
||||
existing_vma = 0;
|
||||
vaddr = vma_address(vma, offset);
|
||||
|
||||
list_for_each_entry(tmpvi, head, probe_list) {
|
||||
if (tmpvi->mm == vma->vm_mm && tmpvi->vaddr == vaddr) {
|
||||
existing_vma = 1;
|
||||
@ -670,14 +687,15 @@ static struct vma_info *__find_next_vma_info(struct list_head *head,
|
||||
* Another vma needs a probe to be installed. However skip
|
||||
* installing the probe if the vma is about to be unlinked.
|
||||
*/
|
||||
if (!existing_vma &&
|
||||
atomic_inc_not_zero(&vma->vm_mm->mm_users)) {
|
||||
if (!existing_vma && atomic_inc_not_zero(&vma->vm_mm->mm_users)) {
|
||||
vi->mm = vma->vm_mm;
|
||||
vi->vaddr = vaddr;
|
||||
list_add(&vi->probe_list, head);
|
||||
|
||||
return vi;
|
||||
}
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
@ -685,11 +703,12 @@ static struct vma_info *__find_next_vma_info(struct list_head *head,
|
||||
* Iterate in the rmap prio tree and find a vma where a probe has not
|
||||
* yet been inserted.
|
||||
*/
|
||||
static struct vma_info *find_next_vma_info(struct list_head *head,
|
||||
loff_t offset, struct address_space *mapping,
|
||||
bool is_register)
|
||||
static struct vma_info *
|
||||
find_next_vma_info(struct list_head *head, loff_t offset, struct address_space *mapping,
|
||||
bool is_register)
|
||||
{
|
||||
struct vma_info *vi, *retvi;
|
||||
|
||||
vi = kzalloc(sizeof(struct vma_info), GFP_KERNEL);
|
||||
if (!vi)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
@ -700,6 +719,7 @@ static struct vma_info *find_next_vma_info(struct list_head *head,
|
||||
|
||||
if (!retvi)
|
||||
kfree(vi);
|
||||
|
||||
return retvi;
|
||||
}
|
||||
|
||||
@ -711,16 +731,23 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
|
||||
struct vma_info *vi, *tmpvi;
|
||||
struct mm_struct *mm;
|
||||
loff_t vaddr;
|
||||
int ret = 0;
|
||||
int ret;
|
||||
|
||||
mapping = uprobe->inode->i_mapping;
|
||||
INIT_LIST_HEAD(&try_list);
|
||||
while ((vi = find_next_vma_info(&try_list, uprobe->offset,
|
||||
mapping, is_register)) != NULL) {
|
||||
|
||||
ret = 0;
|
||||
|
||||
for (;;) {
|
||||
vi = find_next_vma_info(&try_list, uprobe->offset, mapping, is_register);
|
||||
if (!vi)
|
||||
break;
|
||||
|
||||
if (IS_ERR(vi)) {
|
||||
ret = PTR_ERR(vi);
|
||||
break;
|
||||
}
|
||||
|
||||
mm = vi->mm;
|
||||
down_read(&mm->mmap_sem);
|
||||
vma = find_vma(mm, (unsigned long)vi->vaddr);
|
||||
@ -755,19 +782,21 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
list_for_each_entry_safe(vi, tmpvi, &try_list, probe_list) {
|
||||
list_del(&vi->probe_list);
|
||||
kfree(vi);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __register_uprobe(struct uprobe *uprobe)
|
||||
static int __uprobe_register(struct uprobe *uprobe)
|
||||
{
|
||||
return register_for_each_vma(uprobe, true);
|
||||
}
|
||||
|
||||
static void __unregister_uprobe(struct uprobe *uprobe)
|
||||
static void __uprobe_unregister(struct uprobe *uprobe)
|
||||
{
|
||||
if (!register_for_each_vma(uprobe, false))
|
||||
delete_uprobe(uprobe);
|
||||
@ -776,15 +805,15 @@ static void __unregister_uprobe(struct uprobe *uprobe)
|
||||
}
|
||||
|
||||
/*
|
||||
* register_uprobe - register a probe
|
||||
* uprobe_register - register a probe
|
||||
* @inode: the file in which the probe has to be placed.
|
||||
* @offset: offset from the start of the file.
|
||||
* @consumer: information on howto handle the probe..
|
||||
*
|
||||
* Apart from the access refcount, register_uprobe() takes a creation
|
||||
* Apart from the access refcount, uprobe_register() takes a creation
|
||||
* refcount (thro alloc_uprobe) if and only if this @uprobe is getting
|
||||
* inserted into the rbtree (i.e first consumer for a @inode:@offset
|
||||
* tuple). Creation refcount stops unregister_uprobe from freeing the
|
||||
* tuple). Creation refcount stops uprobe_unregister from freeing the
|
||||
* @uprobe even before the register operation is complete. Creation
|
||||
* refcount is released when the last @consumer for the @uprobe
|
||||
* unregisters.
|
||||
@ -792,28 +821,29 @@ static void __unregister_uprobe(struct uprobe *uprobe)
|
||||
* Return errno if it cannot successully install probes
|
||||
* else return 0 (success)
|
||||
*/
|
||||
int register_uprobe(struct inode *inode, loff_t offset,
|
||||
struct uprobe_consumer *consumer)
|
||||
int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer)
|
||||
{
|
||||
struct uprobe *uprobe;
|
||||
int ret = -EINVAL;
|
||||
int ret;
|
||||
|
||||
if (!inode || !consumer || consumer->next)
|
||||
return ret;
|
||||
return -EINVAL;
|
||||
|
||||
if (offset > i_size_read(inode))
|
||||
return ret;
|
||||
return -EINVAL;
|
||||
|
||||
ret = 0;
|
||||
mutex_lock(uprobes_hash(inode));
|
||||
uprobe = alloc_uprobe(inode, offset);
|
||||
if (uprobe && !add_consumer(uprobe, consumer)) {
|
||||
ret = __register_uprobe(uprobe);
|
||||
|
||||
if (uprobe && !consumer_add(uprobe, consumer)) {
|
||||
ret = __uprobe_register(uprobe);
|
||||
if (ret) {
|
||||
uprobe->consumers = NULL;
|
||||
__unregister_uprobe(uprobe);
|
||||
} else
|
||||
__uprobe_unregister(uprobe);
|
||||
} else {
|
||||
uprobe->flags |= UPROBES_RUN_HANDLER;
|
||||
}
|
||||
}
|
||||
|
||||
mutex_unlock(uprobes_hash(inode));
|
||||
@ -823,15 +853,14 @@ int register_uprobe(struct inode *inode, loff_t offset,
|
||||
}
|
||||
|
||||
/*
|
||||
* unregister_uprobe - unregister a already registered probe.
|
||||
* uprobe_unregister - unregister a already registered probe.
|
||||
* @inode: the file in which the probe has to be removed.
|
||||
* @offset: offset from the start of the file.
|
||||
* @consumer: identify which probe if multiple probes are colocated.
|
||||
*/
|
||||
void unregister_uprobe(struct inode *inode, loff_t offset,
|
||||
struct uprobe_consumer *consumer)
|
||||
void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer)
|
||||
{
|
||||
struct uprobe *uprobe = NULL;
|
||||
struct uprobe *uprobe;
|
||||
|
||||
if (!inode || !consumer)
|
||||
return;
|
||||
@ -841,15 +870,14 @@ void unregister_uprobe(struct inode *inode, loff_t offset,
|
||||
return;
|
||||
|
||||
mutex_lock(uprobes_hash(inode));
|
||||
if (!del_consumer(uprobe, consumer))
|
||||
goto unreg_out;
|
||||
|
||||
if (!uprobe->consumers) {
|
||||
__unregister_uprobe(uprobe);
|
||||
uprobe->flags &= ~UPROBES_RUN_HANDLER;
|
||||
if (consumer_del(uprobe, consumer)) {
|
||||
if (!uprobe->consumers) {
|
||||
__uprobe_unregister(uprobe);
|
||||
uprobe->flags &= ~UPROBES_RUN_HANDLER;
|
||||
}
|
||||
}
|
||||
|
||||
unreg_out:
|
||||
mutex_unlock(uprobes_hash(inode));
|
||||
if (uprobe)
|
||||
put_uprobe(uprobe);
|
||||
@ -870,6 +898,7 @@ static struct rb_node *find_least_offset_node(struct inode *inode)
|
||||
while (n) {
|
||||
uprobe = rb_entry(n, struct uprobe, rb_node);
|
||||
match = match_uprobe(&u, uprobe);
|
||||
|
||||
if (uprobe->inode == inode)
|
||||
close_node = n;
|
||||
|
||||
@ -881,6 +910,7 @@ static struct rb_node *find_least_offset_node(struct inode *inode)
|
||||
else
|
||||
n = n->rb_right;
|
||||
}
|
||||
|
||||
return close_node;
|
||||
}
|
||||
|
||||
@ -890,11 +920,13 @@ static struct rb_node *find_least_offset_node(struct inode *inode)
|
||||
static void build_probe_list(struct inode *inode, struct list_head *head)
|
||||
{
|
||||
struct uprobe *uprobe;
|
||||
struct rb_node *n;
|
||||
unsigned long flags;
|
||||
struct rb_node *n;
|
||||
|
||||
spin_lock_irqsave(&uprobes_treelock, flags);
|
||||
|
||||
n = find_least_offset_node(inode);
|
||||
|
||||
for (; n; n = rb_next(n)) {
|
||||
uprobe = rb_entry(n, struct uprobe, rb_node);
|
||||
if (uprobe->inode != inode)
|
||||
@ -903,6 +935,7 @@ static void build_probe_list(struct inode *inode, struct list_head *head)
|
||||
list_add(&uprobe->pending_list, head);
|
||||
atomic_inc(&uprobe->ref);
|
||||
}
|
||||
|
||||
spin_unlock_irqrestore(&uprobes_treelock, flags);
|
||||
}
|
||||
|
||||
@ -912,42 +945,44 @@ static void build_probe_list(struct inode *inode, struct list_head *head)
|
||||
*
|
||||
* Return -ve no if we fail to insert probes and we cannot
|
||||
* bail-out.
|
||||
* Return 0 otherwise. i.e :
|
||||
* Return 0 otherwise. i.e:
|
||||
*
|
||||
* - successful insertion of probes
|
||||
* - (or) no possible probes to be inserted.
|
||||
* - (or) insertion of probes failed but we can bail-out.
|
||||
*/
|
||||
int mmap_uprobe(struct vm_area_struct *vma)
|
||||
int uprobe_mmap(struct vm_area_struct *vma)
|
||||
{
|
||||
struct list_head tmp_list;
|
||||
struct uprobe *uprobe, *u;
|
||||
struct inode *inode;
|
||||
int ret = 0;
|
||||
int ret;
|
||||
|
||||
if (!atomic_read(&uprobe_events) || !valid_vma(vma, true))
|
||||
return ret; /* Bail-out */
|
||||
return 0;
|
||||
|
||||
inode = vma->vm_file->f_mapping->host;
|
||||
if (!inode)
|
||||
return ret;
|
||||
return 0;
|
||||
|
||||
INIT_LIST_HEAD(&tmp_list);
|
||||
mutex_lock(uprobes_mmap_hash(inode));
|
||||
build_probe_list(inode, &tmp_list);
|
||||
|
||||
ret = 0;
|
||||
|
||||
list_for_each_entry_safe(uprobe, u, &tmp_list, pending_list) {
|
||||
loff_t vaddr;
|
||||
|
||||
list_del(&uprobe->pending_list);
|
||||
if (!ret) {
|
||||
vaddr = vma_address(vma, uprobe->offset);
|
||||
if (vaddr < vma->vm_start || vaddr >= vma->vm_end) {
|
||||
put_uprobe(uprobe);
|
||||
continue;
|
||||
if (vaddr >= vma->vm_start && vaddr < vma->vm_end) {
|
||||
ret = install_breakpoint(vma->vm_mm, uprobe, vma, vaddr);
|
||||
/* Ignore double add: */
|
||||
if (ret == -EEXIST)
|
||||
ret = 0;
|
||||
}
|
||||
ret = install_breakpoint(vma->vm_mm, uprobe, vma,
|
||||
vaddr);
|
||||
if (ret == -EEXIST)
|
||||
ret = 0;
|
||||
}
|
||||
put_uprobe(uprobe);
|
||||
}
|
||||
|
||||
12
mm/mmap.c
12
mm/mmap.c
@ -618,10 +618,10 @@ again: remove_next = 1 + (end > next->vm_end);
|
||||
mutex_unlock(&mapping->i_mmap_mutex);
|
||||
|
||||
if (root) {
|
||||
mmap_uprobe(vma);
|
||||
uprobe_mmap(vma);
|
||||
|
||||
if (adjust_next)
|
||||
mmap_uprobe(next);
|
||||
uprobe_mmap(next);
|
||||
}
|
||||
|
||||
if (remove_next) {
|
||||
@ -646,7 +646,7 @@ again: remove_next = 1 + (end > next->vm_end);
|
||||
}
|
||||
}
|
||||
if (insert && file)
|
||||
mmap_uprobe(insert);
|
||||
uprobe_mmap(insert);
|
||||
|
||||
validate_mm(mm);
|
||||
|
||||
@ -1340,7 +1340,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
|
||||
} else if ((flags & MAP_POPULATE) && !(flags & MAP_NONBLOCK))
|
||||
make_pages_present(addr, addr + len);
|
||||
|
||||
if (file && mmap_uprobe(vma))
|
||||
if (file && uprobe_mmap(vma))
|
||||
/* matching probes but cannot insert */
|
||||
goto unmap_and_free_vma;
|
||||
|
||||
@ -2301,7 +2301,7 @@ int insert_vm_struct(struct mm_struct * mm, struct vm_area_struct * vma)
|
||||
security_vm_enough_memory_mm(mm, vma_pages(vma)))
|
||||
return -ENOMEM;
|
||||
|
||||
if (vma->vm_file && mmap_uprobe(vma))
|
||||
if (vma->vm_file && uprobe_mmap(vma))
|
||||
return -EINVAL;
|
||||
|
||||
vma_link(mm, vma, prev, rb_link, rb_parent);
|
||||
@ -2374,7 +2374,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
|
||||
if (new_vma->vm_file) {
|
||||
get_file(new_vma->vm_file);
|
||||
|
||||
if (mmap_uprobe(new_vma))
|
||||
if (uprobe_mmap(new_vma))
|
||||
goto out_free_mempol;
|
||||
|
||||
if (vma->vm_flags & VM_EXECUTABLE)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user