[-tip,v9,04/14] kprobes: treewide: Make it harder to refer kretprobe_trampoline directly

Message ID	162601051961.1318837.8618785066409884429.stgit@devnote2 (mailing list archive)
State	Not Applicable
Headers	show Return-Path: <bpf-owner@kernel.org> From: Masami Hiramatsu <mhiramat@kernel.org> To: Steven Rostedt <rostedt@goodmis.org>, Josh Poimboeuf <jpoimboe@redhat.com>, Ingo Molnar <mingo@kernel.org> Cc: X86 ML <x86@kernel.org>, Masami Hiramatsu <mhiramat@kernel.org>, Daniel Xu <dxu@dxuuu.xyz>, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, kuba@kernel.org, mingo@redhat.com, ast@kernel.org, Thomas Gleixner <tglx@linutronix.de>, Borislav Petkov <bp@alien8.de>, Peter Zijlstra <peterz@infradead.org>, kernel-team@fb.com, yhs@fb.com, linux-ia64@vger.kernel.org, Abhishek Sagar <sagar.abhishek@gmail.com>, Andrii Nakryiko <andrii.nakryiko@gmail.com> Subject: [PATCH -tip v9 04/14] kprobes: treewide: Make it harder to refer kretprobe_trampoline directly Date: Sun, 11 Jul 2021 22:35:19 +0900 Message-Id: <162601051961.1318837.8618785066409884429.stgit@devnote2> In-Reply-To: <162601048053.1318837.1550594515476777588.stgit@devnote2> References: <162601048053.1318837.1550594515476777588.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk
Series	kprobes: Fix stacktrace with kretprobes on x86 \| expand [-tip,v9,00/14] kprobes: Fix stacktrace with kretprobes on x86 [-tip,v9,01/14] ia64: kprobes: Fix to pass correct trampoline address to the handler [-tip,v9,02/14] kprobes: treewide: Replace arch_deref_entry_point() with dereference_symbol_descrip… [-tip,v9,03/14] kprobes: treewide: Remove trampoline_address from kretprobe_trampoline_handler() [-tip,v9,04/14] kprobes: treewide: Make it harder to refer kretprobe_trampoline directly [-tip,v9,05/14] kprobes: Add kretprobe_find_ret_addr() for searching return address [-tip,v9,06/14] x86/kprobes: Add UNWIND_HINT_FUNC on kretprobe_trampoline() [-tip,v9,07/14] ARC: Add instruction_pointer_set() API [-tip,v9,08/14] ia64: Add instruction_pointer_set() API [-tip,v9,09/14] arm: kprobes: Make space for instruction pointer on stack [-tip,v9,10/14] kprobes: Enable stacktrace from pt_regs in kretprobe handler [-tip,v9,11/14] x86/kprobes: Push a fake return address at kretprobe_trampoline [-tip,v9,12/14] x86/unwind: Recover kretprobe trampoline entry [-tip,v9,13/14] tracing: Show kretprobe unknown indicator only for kretprobe_trampoline [-tip,v9,14/14] x86/kprobes: Fixup return address in generic trampoline handler

Context	Check	Description
netdev/tree_selection	success	Not a local patch

diff --git a/arch/arc/include/asm/kprobes.h b/arch/arc/include/asm/kprobes.h index 2134721dce44..de1566e32cb8 100644 --- a/arch/arc/include/asm/kprobes.h +++ b/arch/arc/include/asm/kprobes.h @@ -46,7 +46,7 @@ struct kprobe_ctlblk { }; int kprobe_fault_handler(struct pt_regs *regs, unsigned long cause); -void kretprobe_trampoline(void); +void __kretprobe_trampoline(void); void trap_is_kprobe(unsigned long address, struct pt_regs *regs); #else #define trap_is_kprobe(address, regs) diff --git a/arch/arc/kernel/kprobes.c b/arch/arc/kernel/kprobes.c index 3cee75c87f97..e71d64119d71 100644 --- a/arch/arc/kernel/kprobes.c +++ b/arch/arc/kernel/kprobes.c @@ -363,8 +363,9 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self, static void __used kretprobe_trampoline_holder(void) { - __asm__ __volatile__(".global kretprobe_trampoline\n" - "kretprobe_trampoline:\n" "nop\n"); + __asm__ __volatile__(".global __kretprobe_trampoline\n" + "__kretprobe_trampoline:\n" + "nop\n"); } void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, @@ -375,7 +376,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, ri->fp = NULL; /* Replace the return addr with trampoline addr */ - regs->blink = (unsigned long)&kretprobe_trampoline; + regs->blink = (unsigned long)&__kretprobe_trampoline; } static int __kprobes trampoline_probe_handler(struct kprobe *p, @@ -390,7 +391,7 @@ static int __kprobes trampoline_probe_handler(struct kprobe *p, } static struct kprobe trampoline_p = { - .addr = (kprobe_opcode_t *) &kretprobe_trampoline, + .addr = (kprobe_opcode_t *) &__kretprobe_trampoline, .pre_handler = trampoline_probe_handler }; @@ -402,7 +403,7 @@ int __init arch_init_kprobes(void) int __kprobes arch_trampoline_kprobe(struct kprobe *p) { - if (p->addr == (kprobe_opcode_t *) &kretprobe_trampoline) + if (p->addr == (kprobe_opcode_t *) &__kretprobe_trampoline) return 1; return 0; diff --git a/arch/arm/probes/kprobes/core.c b/arch/arm/probes/kprobes/core.c index 08098ed6f035..67ce7eb8f285 100644 --- a/arch/arm/probes/kprobes/core.c +++ b/arch/arm/probes/kprobes/core.c @@ -373,7 +373,7 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self, * for kretprobe handlers which should normally be interested in r0 only * anyway. */ -void __naked __kprobes kretprobe_trampoline(void) +void __naked __kprobes __kretprobe_trampoline(void) { __asm__ __volatile__ ( "stmdb sp!, {r0 - r11} \n\t" @@ -389,7 +389,7 @@ void __naked __kprobes kretprobe_trampoline(void) : : : "memory"); } -/* Called from kretprobe_trampoline */ +/* Called from __kretprobe_trampoline */ static __used __kprobes void *trampoline_handler(struct pt_regs *regs) { return (void *)kretprobe_trampoline_handler(regs, (void *)regs->ARM_fp); @@ -402,7 +402,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, ri->fp = (void *)regs->ARM_fp; /* Replace the return addr with trampoline addr. */ - regs->ARM_lr = (unsigned long)&kretprobe_trampoline; + regs->ARM_lr = (unsigned long)&__kretprobe_trampoline; } int __kprobes arch_trampoline_kprobe(struct kprobe *p) diff --git a/arch/arm64/include/asm/kprobes.h b/arch/arm64/include/asm/kprobes.h index 5d38ff4a4806..05cd82eeca13 100644 --- a/arch/arm64/include/asm/kprobes.h +++ b/arch/arm64/include/asm/kprobes.h @@ -39,7 +39,7 @@ void arch_remove_kprobe(struct kprobe *); int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr); int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, void *data); -void kretprobe_trampoline(void); +void __kretprobe_trampoline(void); void __kprobes *trampoline_probe_handler(struct pt_regs *regs); #endif /* CONFIG_KPROBES */ diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c index f627a12984a8..e7ad6da980e8 100644 --- a/arch/arm64/kernel/probes/kprobes.c +++ b/arch/arm64/kernel/probes/kprobes.c @@ -411,7 +411,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, ri->fp = (void *)kernel_stack_pointer(regs); /* replace return addr (x30) with trampoline */ - regs->regs[30] = (long)&kretprobe_trampoline; + regs->regs[30] = (long)&__kretprobe_trampoline; } int __kprobes arch_trampoline_kprobe(struct kprobe *p) diff --git a/arch/arm64/kernel/probes/kprobes_trampoline.S b/arch/arm64/kernel/probes/kprobes_trampoline.S index 288a84e253cc..520ee8711db1 100644 --- a/arch/arm64/kernel/probes/kprobes_trampoline.S +++ b/arch/arm64/kernel/probes/kprobes_trampoline.S @@ -61,7 +61,7 @@ ldp x28, x29, [sp, #S_X28] .endm -SYM_CODE_START(kretprobe_trampoline) +SYM_CODE_START(__kretprobe_trampoline) sub sp, sp, #PT_REGS_SIZE save_all_base_regs @@ -79,4 +79,4 @@ SYM_CODE_START(kretprobe_trampoline) add sp, sp, #PT_REGS_SIZE ret -SYM_CODE_END(kretprobe_trampoline) +SYM_CODE_END(__kretprobe_trampoline) diff --git a/arch/csky/include/asm/kprobes.h b/arch/csky/include/asm/kprobes.h index b647bbde4d6d..55267cbf5204 100644 --- a/arch/csky/include/asm/kprobes.h +++ b/arch/csky/include/asm/kprobes.h @@ -41,7 +41,7 @@ void arch_remove_kprobe(struct kprobe *p); int kprobe_fault_handler(struct pt_regs *regs, unsigned int trapnr); int kprobe_breakpoint_handler(struct pt_regs *regs); int kprobe_single_step_handler(struct pt_regs *regs); -void kretprobe_trampoline(void); +void __kretprobe_trampoline(void); void __kprobes *trampoline_probe_handler(struct pt_regs *regs); #endif /* CONFIG_KPROBES */ diff --git a/arch/csky/kernel/probes/kprobes.c b/arch/csky/kernel/probes/kprobes.c index bf1e6c7094fc..8d1fb4e79788 100644 --- a/arch/csky/kernel/probes/kprobes.c +++ b/arch/csky/kernel/probes/kprobes.c @@ -395,7 +395,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, { ri->ret_addr = (kprobe_opcode_t *)regs->lr; ri->fp = NULL; - regs->lr = (unsigned long) &kretprobe_trampoline; + regs->lr = (unsigned long) &__kretprobe_trampoline; } int __kprobes arch_trampoline_kprobe(struct kprobe *p) diff --git a/arch/csky/kernel/probes/kprobes_trampoline.S b/arch/csky/kernel/probes/kprobes_trampoline.S index b1fe3af24f03..ba48ad04a847 100644 --- a/arch/csky/kernel/probes/kprobes_trampoline.S +++ b/arch/csky/kernel/probes/kprobes_trampoline.S @@ -4,7 +4,7 @@ #include <abi/entry.h> -ENTRY(kretprobe_trampoline) +ENTRY(__kretprobe_trampoline) SAVE_REGS_FTRACE mov a0, sp /* pt_regs */ @@ -16,4 +16,4 @@ ENTRY(kretprobe_trampoline) RESTORE_REGS_FTRACE rts -ENDPROC(kretprobe_trampoline) +ENDPROC(__kretprobe_trampoline) diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index 44c84c20b626..1a7bab1c5d7c 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -392,7 +392,7 @@ static void __kprobes set_current_kprobe(struct kprobe *p, __this_cpu_write(current_kprobe, p); } -void kretprobe_trampoline(void) +void __kretprobe_trampoline(void) { } @@ -414,7 +414,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, ri->fp = NULL; /* Replace the return addr with trampoline addr */ - regs->b0 = (unsigned long)dereference_function_descriptor(kretprobe_trampoline); + regs->b0 = (unsigned long)dereference_function_descriptor(__kretprobe_trampoline); } /* Check the instruction in the slot is break */ @@ -897,14 +897,14 @@ static struct kprobe trampoline_p = { int __init arch_init_kprobes(void) { trampoline_p.addr = - dereference_function_descriptor(kretprobe_trampoline); + dereference_function_descriptor(__kretprobe_trampoline); return register_kprobe(&trampoline_p); } int __kprobes arch_trampoline_kprobe(struct kprobe *p) { if (p->addr == - dereference_function_descriptor(kretprobe_trampoline)) + dereference_function_descriptor(__kretprobe_trampoline)) return 1; return 0; diff --git a/arch/mips/kernel/kprobes.c b/arch/mips/kernel/kprobes.c index b33bd2498651..6c7f3b143fdc 100644 --- a/arch/mips/kernel/kprobes.c +++ b/arch/mips/kernel/kprobes.c @@ -460,14 +460,14 @@ static void __used kretprobe_trampoline_holder(void) /* Keep the assembler from reordering and placing JR here. */ ".set noreorder\n\t" "nop\n\t" - ".global kretprobe_trampoline\n" - "kretprobe_trampoline:\n\t" + ".global __kretprobe_trampoline\n" + "__kretprobe_trampoline:\n\t" "nop\n\t" ".set pop" : : : "memory"); } -void kretprobe_trampoline(void); +void __kretprobe_trampoline(void); void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) @@ -476,7 +476,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, ri->fp = NULL; /* Replace the return addr with trampoline addr */ - regs->regs[31] = (unsigned long)kretprobe_trampoline; + regs->regs[31] = (unsigned long)__kretprobe_trampoline; } /* @@ -496,14 +496,14 @@ static int __kprobes trampoline_probe_handler(struct kprobe *p, int __kprobes arch_trampoline_kprobe(struct kprobe *p) { - if (p->addr == (kprobe_opcode_t *)kretprobe_trampoline) + if (p->addr == (kprobe_opcode_t *)__kretprobe_trampoline) return 1; return 0; } static struct kprobe trampoline_p = { - .addr = (kprobe_opcode_t *)kretprobe_trampoline, + .addr = (kprobe_opcode_t *)__kretprobe_trampoline, .pre_handler = trampoline_probe_handler }; diff --git a/arch/parisc/kernel/kprobes.c b/arch/parisc/kernel/kprobes.c index 4a35ac6e2ca2..e2bdb5a5f93e 100644 --- a/arch/parisc/kernel/kprobes.c +++ b/arch/parisc/kernel/kprobes.c @@ -175,7 +175,7 @@ int __kprobes parisc_kprobe_ss_handler(struct pt_regs *regs) return 1; } -void kretprobe_trampoline(void) +void __kretprobe_trampoline(void) { asm volatile("nop"); asm volatile("nop"); @@ -217,6 +217,6 @@ int __kprobes arch_trampoline_kprobe(struct kprobe *p) int __init arch_init_kprobes(void) { trampoline_p.addr = (kprobe_opcode_t *) - dereference_function_descriptor(kretprobe_trampoline); + dereference_function_descriptor(__kretprobe_trampoline); return register_kprobe(&trampoline_p); } diff --git a/arch/powerpc/include/asm/kprobes.h b/arch/powerpc/include/asm/kprobes.h index 4fc0e15e23a5..bab364152b29 100644 --- a/arch/powerpc/include/asm/kprobes.h +++ b/arch/powerpc/include/asm/kprobes.h @@ -51,7 +51,7 @@ extern kprobe_opcode_t optprobe_template_end[]; #define flush_insn_slot(p) do { } while (0) #define kretprobe_blacklist_size 0 -void kretprobe_trampoline(void); +void __kretprobe_trampoline(void); extern void arch_remove_kprobe(struct kprobe *p); /* Architecture specific copy of original instruction */ diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index 0764e8a0de69..03c85962296a 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -237,7 +237,7 @@ void arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) ri->fp = NULL; /* Replace the return addr with trampoline addr */ - regs->link = (unsigned long)kretprobe_trampoline; + regs->link = (unsigned long)__kretprobe_trampoline; } NOKPROBE_SYMBOL(arch_prepare_kretprobe); @@ -402,12 +402,12 @@ NOKPROBE_SYMBOL(kprobe_handler); * - When the probed function returns, this probe * causes the handlers to fire */ -asm(".global kretprobe_trampoline\n" - ".type kretprobe_trampoline, @function\n" - "kretprobe_trampoline:\n" +asm(".global __kretprobe_trampoline\n" + ".type __kretprobe_trampoline, @function\n" + "__kretprobe_trampoline:\n" "nop\n" "blr\n" - ".size kretprobe_trampoline, .-kretprobe_trampoline\n"); + ".size __kretprobe_trampoline, .-__kretprobe_trampoline\n"); /* * Called when the probe at kretprobe trampoline is hit @@ -426,7 +426,7 @@ static int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) * as it is used to determine the return address from the trap. * For (2), since nip is not honoured with optprobes, we instead setup * the link register properly so that the subsequent 'blr' in - * kretprobe_trampoline jumps back to the right instruction. + * __kretprobe_trampoline jumps back to the right instruction. * * For nip, we should set the address to the previous instruction since * we end up emulating it in kprobe_handler(), which increments the nip @@ -542,7 +542,7 @@ int kprobe_fault_handler(struct pt_regs *regs, int trapnr) NOKPROBE_SYMBOL(kprobe_fault_handler); static struct kprobe trampoline_p = { - .addr = (kprobe_opcode_t *) &kretprobe_trampoline, + .addr = (kprobe_opcode_t *) &__kretprobe_trampoline, .pre_handler = trampoline_probe_handler }; @@ -553,7 +553,7 @@ int __init arch_init_kprobes(void) int arch_trampoline_kprobe(struct kprobe *p) { - if (p->addr == (kprobe_opcode_t *)&kretprobe_trampoline) + if (p->addr == (kprobe_opcode_t *)&__kretprobe_trampoline) return 1; return 0; diff --git a/arch/powerpc/kernel/optprobes.c b/arch/powerpc/kernel/optprobes.c index 325ba544883c..ce1903064031 100644 --- a/arch/powerpc/kernel/optprobes.c +++ b/arch/powerpc/kernel/optprobes.c @@ -56,7 +56,7 @@ static unsigned long can_optimize(struct kprobe *p) * has a 'nop' instruction, which can be emulated. * So further checks can be skipped. */ - if (p->addr == (kprobe_opcode_t *)&kretprobe_trampoline) + if (p->addr == (kprobe_opcode_t *)&__kretprobe_trampoline) return addr + sizeof(kprobe_opcode_t); /* diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c index 2b0d04a1b7d2..7d8867106734 100644 --- a/arch/powerpc/kernel/stacktrace.c +++ b/arch/powerpc/kernel/stacktrace.c @@ -154,7 +154,7 @@ int __no_sanitize_address arch_stack_walk_reliable(stack_trace_consume_fn consum * Mark stacktraces with kretprobed functions on them * as unreliable. */ - if (ip == (unsigned long)kretprobe_trampoline) + if (ip == (unsigned long)__kretprobe_trampoline) return -EINVAL; #endif diff --git a/arch/riscv/include/asm/kprobes.h b/arch/riscv/include/asm/kprobes.h index 4647d38018f6..3e5c8f11ad5a 100644 --- a/arch/riscv/include/asm/kprobes.h +++ b/arch/riscv/include/asm/kprobes.h @@ -47,7 +47,7 @@ void arch_remove_kprobe(struct kprobe *p); int kprobe_fault_handler(struct pt_regs *regs, unsigned int trapnr); bool kprobe_breakpoint_handler(struct pt_regs *regs); bool kprobe_single_step_handler(struct pt_regs *regs); -void kretprobe_trampoline(void); +void __kretprobe_trampoline(void); void __kprobes *trampoline_probe_handler(struct pt_regs *regs); #endif /* CONFIG_KPROBES */ diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c index 26a47870a237..b45ae1469d53 100644 --- a/arch/riscv/kernel/probes/kprobes.c +++ b/arch/riscv/kernel/probes/kprobes.c @@ -377,7 +377,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, { ri->ret_addr = (kprobe_opcode_t *)regs->ra; ri->fp = NULL; - regs->ra = (unsigned long) &kretprobe_trampoline; + regs->ra = (unsigned long) &__kretprobe_trampoline; } int __kprobes arch_trampoline_kprobe(struct kprobe *p) diff --git a/arch/riscv/kernel/probes/kprobes_trampoline.S b/arch/riscv/kernel/probes/kprobes_trampoline.S index 6e85d021e2a2..7bdb09ded39b 100644 --- a/arch/riscv/kernel/probes/kprobes_trampoline.S +++ b/arch/riscv/kernel/probes/kprobes_trampoline.S @@ -75,7 +75,7 @@ REG_L x31, PT_T6(sp) .endm -ENTRY(kretprobe_trampoline) +ENTRY(__kretprobe_trampoline) addi sp, sp, -(PT_SIZE_ON_STACK) save_all_base_regs @@ -90,4 +90,4 @@ ENTRY(kretprobe_trampoline) addi sp, sp, PT_SIZE_ON_STACK ret -ENDPROC(kretprobe_trampoline) +ENDPROC(__kretprobe_trampoline) diff --git a/arch/s390/include/asm/kprobes.h b/arch/s390/include/asm/kprobes.h index 09cdb632a490..5eb722c984e4 100644 --- a/arch/s390/include/asm/kprobes.h +++ b/arch/s390/include/asm/kprobes.h @@ -70,7 +70,7 @@ struct kprobe_ctlblk { }; void arch_remove_kprobe(struct kprobe *p); -void kretprobe_trampoline(void); +void __kretprobe_trampoline(void); int kprobe_fault_handler(struct pt_regs *regs, int trapnr); int kprobe_exceptions_notify(struct notifier_block *self, diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c index 71d86922dd51..b190c0332517 100644 --- a/arch/s390/kernel/kprobes.c +++ b/arch/s390/kernel/kprobes.c @@ -247,7 +247,7 @@ void arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) ri->fp = NULL; /* Replace the return addr with trampoline addr */ - regs->gprs[14] = (unsigned long) &kretprobe_trampoline; + regs->gprs[14] = (unsigned long) &__kretprobe_trampoline; } NOKPROBE_SYMBOL(arch_prepare_kretprobe); @@ -339,8 +339,8 @@ NOKPROBE_SYMBOL(kprobe_handler); */ static void __used kretprobe_trampoline_holder(void) { - asm volatile(".global kretprobe_trampoline\n" - "kretprobe_trampoline: bcr 0,0\n"); + asm volatile(".global __kretprobe_trampoline\n" + "__kretprobe_trampoline: bcr 0,0\n"); } /* @@ -514,7 +514,7 @@ int kprobe_exceptions_notify(struct notifier_block *self, NOKPROBE_SYMBOL(kprobe_exceptions_notify); static struct kprobe trampoline = { - .addr = (kprobe_opcode_t *) &kretprobe_trampoline, + .addr = (kprobe_opcode_t *) &__kretprobe_trampoline, .pre_handler = trampoline_probe_handler }; @@ -525,6 +525,6 @@ int __init arch_init_kprobes(void) int arch_trampoline_kprobe(struct kprobe *p) { - return p->addr == (kprobe_opcode_t *) &kretprobe_trampoline; + return p->addr == (kprobe_opcode_t *) &__kretprobe_trampoline; } NOKPROBE_SYMBOL(arch_trampoline_kprobe); diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c index 101477b3e263..b7bb1981e9ee 100644 --- a/arch/s390/kernel/stacktrace.c +++ b/arch/s390/kernel/stacktrace.c @@ -46,7 +46,7 @@ int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, * Mark stacktraces with kretprobed functions on them * as unreliable. */ - if (state.ip == (unsigned long)kretprobe_trampoline) + if (state.ip == (unsigned long)__kretprobe_trampoline) return -EINVAL; #endif diff --git a/arch/sh/include/asm/kprobes.h b/arch/sh/include/asm/kprobes.h index 6171682f7798..eeba83e0a7d2 100644 --- a/arch/sh/include/asm/kprobes.h +++ b/arch/sh/include/asm/kprobes.h @@ -26,7 +26,7 @@ typedef insn_size_t kprobe_opcode_t; struct kprobe; void arch_remove_kprobe(struct kprobe *); -void kretprobe_trampoline(void); +void __kretprobe_trampoline(void); /* Architecture specific copy of original instruction*/ struct arch_specific_insn { diff --git a/arch/sh/kernel/kprobes.c b/arch/sh/kernel/kprobes.c index 8e76a35e6e33..aed1ea8e2c2f 100644 --- a/arch/sh/kernel/kprobes.c +++ b/arch/sh/kernel/kprobes.c @@ -207,7 +207,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, ri->fp = NULL; /* Replace the return addr with trampoline addr */ - regs->pr = (unsigned long)kretprobe_trampoline; + regs->pr = (unsigned long)__kretprobe_trampoline; } static int __kprobes kprobe_handler(struct pt_regs *regs) @@ -293,13 +293,13 @@ static int __kprobes kprobe_handler(struct pt_regs *regs) */ static void __used kretprobe_trampoline_holder(void) { - asm volatile (".globl kretprobe_trampoline\n" - "kretprobe_trampoline:\n\t" + asm volatile (".globl __kretprobe_trampoline\n" + "__kretprobe_trampoline:\n\t" "nop\n"); } /* - * Called when we hit the probe point at kretprobe_trampoline + * Called when we hit the probe point at __kretprobe_trampoline */ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) { @@ -442,7 +442,7 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self, } static struct kprobe trampoline_p = { - .addr = (kprobe_opcode_t *)&kretprobe_trampoline, + .addr = (kprobe_opcode_t *)&__kretprobe_trampoline, .pre_handler = trampoline_probe_handler }; diff --git a/arch/sparc/include/asm/kprobes.h b/arch/sparc/include/asm/kprobes.h index bfcaa6326c20..06c2bc767ef7 100644 --- a/arch/sparc/include/asm/kprobes.h +++ b/arch/sparc/include/asm/kprobes.h @@ -24,7 +24,7 @@ do { flushi(&(p)->ainsn.insn[0]); \ flushi(&(p)->ainsn.insn[1]); \ } while (0) -void kretprobe_trampoline(void); +void __kretprobe_trampoline(void); /* Architecture specific copy of original instruction*/ struct arch_specific_insn { diff --git a/arch/sparc/kernel/kprobes.c b/arch/sparc/kernel/kprobes.c index 401534236c2e..535c7b35cb59 100644 --- a/arch/sparc/kernel/kprobes.c +++ b/arch/sparc/kernel/kprobes.c @@ -440,7 +440,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, /* Replace the return addr with trampoline addr */ regs->u_regs[UREG_RETPC] = - ((unsigned long)kretprobe_trampoline) - 8; + ((unsigned long)__kretprobe_trampoline) - 8; } /* @@ -465,13 +465,13 @@ static int __kprobes trampoline_probe_handler(struct kprobe *p, static void __used kretprobe_trampoline_holder(void) { - asm volatile(".global kretprobe_trampoline\n" - "kretprobe_trampoline:\n" + asm volatile(".global __kretprobe_trampoline\n" + "__kretprobe_trampoline:\n" "\tnop\n" "\tnop\n"); } static struct kprobe trampoline_p = { - .addr = (kprobe_opcode_t *) &kretprobe_trampoline, + .addr = (kprobe_opcode_t *) &__kretprobe_trampoline, .pre_handler = trampoline_probe_handler }; @@ -482,7 +482,7 @@ int __init arch_init_kprobes(void) int __kprobes arch_trampoline_kprobe(struct kprobe *p) { - if (p->addr == (kprobe_opcode_t *)&kretprobe_trampoline) + if (p->addr == (kprobe_opcode_t *)&__kretprobe_trampoline) return 1; return 0; diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c index 0c59ef5971de..79cd23dba5b5 100644 --- a/arch/x86/kernel/kprobes/core.c +++ b/arch/x86/kernel/kprobes/core.c @@ -809,7 +809,7 @@ void arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) ri->fp = sara; /* Replace the return addr with trampoline addr */ - *sara = (unsigned long) &kretprobe_trampoline; + *sara = (unsigned long) &__kretprobe_trampoline; } NOKPROBE_SYMBOL(arch_prepare_kretprobe); @@ -1019,9 +1019,9 @@ NOKPROBE_SYMBOL(kprobe_int3_handler); */ asm( ".text\n" - ".global kretprobe_trampoline\n" - ".type kretprobe_trampoline, @function\n" - "kretprobe_trampoline:\n" + ".global __kretprobe_trampoline\n" + ".type __kretprobe_trampoline, @function\n" + "__kretprobe_trampoline:\n" /* We don't bother saving the ss register */ #ifdef CONFIG_X86_64 " pushq %rsp\n" @@ -1045,14 +1045,14 @@ asm( " popfl\n" #endif " ret\n" - ".size kretprobe_trampoline, .-kretprobe_trampoline\n" + ".size __kretprobe_trampoline, .-__kretprobe_trampoline\n" ); -NOKPROBE_SYMBOL(kretprobe_trampoline); -STACK_FRAME_NON_STANDARD(kretprobe_trampoline); +NOKPROBE_SYMBOL(__kretprobe_trampoline); +STACK_FRAME_NON_STANDARD(__kretprobe_trampoline); /* - * Called from kretprobe_trampoline + * Called from __kretprobe_trampoline */ __used __visible void *trampoline_handler(struct pt_regs *regs) { @@ -1061,7 +1061,7 @@ __used __visible void *trampoline_handler(struct pt_regs *regs) #ifdef CONFIG_X86_32 regs->gs = 0; #endif - regs->ip = (unsigned long)&kretprobe_trampoline; + regs->ip = (unsigned long)&__kretprobe_trampoline; regs->orig_ax = ~0UL; return (void *)kretprobe_trampoline_handler(regs, &regs->sp); diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h index 31cb9a929ac3..8dcfb9cd1bf0 100644 --- a/include/linux/kprobes.h +++ b/include/linux/kprobes.h @@ -188,14 +188,14 @@ extern void arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs); extern int arch_trampoline_kprobe(struct kprobe *p); -void kretprobe_trampoline(void); +void __kretprobe_trampoline(void); /* * Since some architecture uses structured function pointer, * use dereference_function_descriptor() to get real function address. */ static nokprobe_inline void *kretprobe_trampoline_addr(void) { - return dereference_kernel_function_descriptor(kretprobe_trampoline); + return dereference_kernel_function_descriptor(__kretprobe_trampoline); } /* If the trampoline handler called from a kprobe, use this version */ diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index a0bf446bb034..9b2e69619057 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -349,7 +349,7 @@ EXPORT_SYMBOL_GPL(trace_output_call); #ifdef CONFIG_KRETPROBES static inline const char *kretprobed(const char *name) { - static const char tramp_name[] = "kretprobe_trampoline"; + static const char tramp_name[] = "__kretprobe_trampoline"; int size = sizeof(tramp_name); if (strncmp(tramp_name, name, size) == 0)

[-tip,v9,04/14] kprobes: treewide: Make it harder to refer kretprobe_trampoline directly

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