From: "tip-bot2 for Peter Zijlstra" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: x86/core] x86/ibt,ftrace: Make function-graph play nice
Date: Tue, 15 Mar 2022 10:44:01 -0000 [thread overview]
Message-ID: <164734104175.16921.11198842533678838543.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20220308154318.347296408@infradead.org>
The following commit has been merged into the x86/core branch of tip:
Commit-ID: e52fc2cf3f662828cc0d51c4b73bed73ad275fce
Gitweb: https://git.kernel.org/tip/e52fc2cf3f662828cc0d51c4b73bed73ad275fce
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Tue, 08 Mar 2022 16:30:31 +01:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 15 Mar 2022 10:32:37 +01:00
x86/ibt,ftrace: Make function-graph play nice
Return trampoline must not use indirect branch to return; while this
preserves the RSB, it is fundamentally incompatible with IBT. Instead
use a retpoline like ROP gadget that defeats IBT while not unbalancing
the RSB.
And since ftrace_stub is no longer a plain RET, don't use it to copy
from. Since RET is a trivial instruction, poke it directly.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154318.347296408@infradead.org
---
arch/x86/kernel/ftrace.c | 9 ++-------
arch/x86/kernel/ftrace_64.S | 21 +++++++++++++++++----
2 files changed, 19 insertions(+), 11 deletions(-)
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 7cc540e..1e31c7d 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -316,12 +316,12 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)
unsigned long offset;
unsigned long npages;
unsigned long size;
- unsigned long retq;
unsigned long *ptr;
void *trampoline;
void *ip;
/* 48 8b 15 <offset> is movq <offset>(%rip), %rdx */
unsigned const char op_ref[] = { 0x48, 0x8b, 0x15 };
+ unsigned const char retq[] = { RET_INSN_OPCODE, INT3_INSN_OPCODE };
union ftrace_op_code_union op_ptr;
int ret;
@@ -359,12 +359,7 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)
goto fail;
ip = trampoline + size;
-
- /* The trampoline ends with ret(q) */
- retq = (unsigned long)ftrace_stub;
- ret = copy_from_kernel_nofault(ip, (void *)retq, RET_SIZE);
- if (WARN_ON(ret < 0))
- goto fail;
+ memcpy(ip, retq, RET_SIZE);
/* No need to test direct calls on created trampolines */
if (ops->flags & FTRACE_OPS_FL_SAVE_REGS) {
diff --git a/arch/x86/kernel/ftrace_64.S b/arch/x86/kernel/ftrace_64.S
index 11ac028..e32b5cd 100644
--- a/arch/x86/kernel/ftrace_64.S
+++ b/arch/x86/kernel/ftrace_64.S
@@ -176,10 +176,10 @@ SYM_FUNC_END(ftrace_caller);
SYM_FUNC_START(ftrace_epilogue)
/*
* This is weak to keep gas from relaxing the jumps.
- * It is also used to copy the RET for trampolines.
*/
SYM_INNER_LABEL_ALIGN(ftrace_stub, SYM_L_WEAK)
UNWIND_HINT_FUNC
+ ENDBR
RET
SYM_FUNC_END(ftrace_epilogue)
@@ -284,6 +284,7 @@ SYM_FUNC_START(__fentry__)
jnz trace
SYM_INNER_LABEL(ftrace_stub, SYM_L_GLOBAL)
+ ENDBR
RET
trace:
@@ -307,7 +308,7 @@ EXPORT_SYMBOL(__fentry__)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
SYM_FUNC_START(return_to_handler)
- subq $24, %rsp
+ subq $16, %rsp
/* Save the return values */
movq %rax, (%rsp)
@@ -319,7 +320,19 @@ SYM_FUNC_START(return_to_handler)
movq %rax, %rdi
movq 8(%rsp), %rdx
movq (%rsp), %rax
- addq $24, %rsp
- JMP_NOSPEC rdi
+
+ addq $16, %rsp
+ /*
+ * Jump back to the old return address. This cannot be JMP_NOSPEC rdi
+ * since IBT would demand that contain ENDBR, which simply isn't so for
+ * return addresses. Use a retpoline here to keep the RSB balanced.
+ */
+ ANNOTATE_INTRA_FUNCTION_CALL
+ call .Ldo_rop
+ int3
+.Ldo_rop:
+ mov %rdi, (%rsp)
+ UNWIND_HINT_FUNC
+ RET
SYM_FUNC_END(return_to_handler)
#endif
next prev parent reply other threads:[~2022-03-15 10:46 UTC|newest]
Thread overview: 193+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-08 15:30 [PATCH v4 00/45] x86: Kernel IBT Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 01/45] static_call: Avoid building empty .static_call_sites Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 02/45] objtool: Add --dry-run Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 03/45] objtool: Default ignore INT3 for unreachable Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 04/45] objtool,efi: Update __efi64_thunk annotation Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-09 8:35 ` [PATCH v4 04/45] " Miroslav Benes
2022-03-15 10:44 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 05/45] objtool: Have WARN_FUNC fall back to sym+off Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 06/45] x86/ibt: Base IBT bits Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 07/45] x86/ibt: Add ANNOTATE_NOENDBR Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 08/45] x86/text-patching: Make text_gen_insn() play nice with ANNOTATE_NOENDBR Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 09/45] x86/ibt,paravirt: Use text_gen_insn() for paravirt_patch() Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 10/45] x86/entry: Cleanup PARAVIRT Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 11/45] x86/entry,xen: Early rewrite of restore_regs_and_return_to_kernel() Peter Zijlstra
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2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 12/45] x86/ibt,xen: Sprinkle the ENDBR Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 13/45] x86/ibt,entry: Sprinkle ENDBR dust Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 14/45] x86/linkage: Add ENDBR to SYM_FUNC_START*() Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 15/45] x86/ibt,paravirt: Sprinkle ENDBR Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 16/45] x86/ibt,crypto: Add ENDBR for the jump-table entries Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 17/45] x86/ibt,kvm: Add ENDBR to fastops Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 18/45] x86/ibt,ftrace: Search for __fentry__ location Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 19/45] x86/livepatch: Validate " Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-09 8:58 ` [PATCH v4 19/45] " Miroslav Benes
2022-03-15 10:44 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 20/45] x86/ibt,ftrace: Make function-graph play nice Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra [this message]
2022-03-08 15:30 ` [PATCH v4 21/45] x86/ibt,kprobes: Cure sym+0 equals fentry woes Peter Zijlstra
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 22/45] x86/ibt,bpf: Add ENDBR instructions to prologue and trampoline Peter Zijlstra
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2022-03-15 10:44 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 23/45] x86/ibt,ftrace: Add ENDBR to samples/ftrace Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 24/45] x86/ibt: Add IBT feature, MSR and #CP handling Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-09 13:56 ` [PATCH v4 24/45] " Andrew Cooper
2022-03-15 10:43 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 25/45] x86/ibt,kexec: Disable CET on kexec Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 26/45] x86/alternative: Simplify int3_selftest_ip Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 27/45] x86/ibt: Disable IBT around firmware Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 28/45] x86/bugs: Disable Retpoline when IBT Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 29/45] x86/ibt: Annotate text references Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-22 4:43 ` [PATCH v4 29/45] " Masami Hiramatsu
2022-03-22 4:45 ` Alexei Starovoitov
2022-03-08 15:30 ` [PATCH v4 30/45] x86/ibt,ftrace: Annotate ftrace code patching Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 31/45] x86/ibt,sev: Annotations Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 32/45] x86/ibt: Dont generate ENDBR in .discard.text Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 33/45] x86/ibt: Ensure module init/exit points have references Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 34/45] objtool: Rename --duplicate to --lto Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 35/45] objtool: Ignore extra-symbol code Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 36/45] x86: Mark stop_this_cpu() __noreturn Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 37/45] exit: Mark do_group_exit() __noreturn Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 38/45] objtool: Rework ASM_REACHABLE Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 39/45] x86: Annotate call_on_stack() Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 40/45] Kbuild: Allow whole module objtool runs Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 41/45] objtool: Read the NOENDBR annotation Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 42/45] objtool: Add IBT/ENDBR decoding Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 43/45] objtool: Validate IBT assumptions Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 44/45] objtool: Find unused ENDBR instructions Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-15 15:39 ` David Laight
2022-03-17 22:22 ` Josh Poimboeuf
2022-03-18 10:49 ` Peter Zijlstra
2022-03-08 15:30 ` [PATCH v4 45/45] x86/alternative: Use .ibt_endbr_seal to seal indirect calls Peter Zijlstra
2022-03-09 7:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` tip-bot2 for Peter Zijlstra
2022-03-08 20:00 ` [PATCH v4 00/45] x86: Kernel IBT Alexei Starovoitov
2022-03-08 22:01 ` Peter Zijlstra
2022-03-08 22:32 ` Peter Zijlstra
2022-03-09 1:02 ` Peter Zijlstra
2022-03-09 19:09 ` Alexei Starovoitov
2022-03-10 9:35 ` Peter Zijlstra
2022-03-10 13:47 ` Peter Zijlstra
2022-03-10 14:37 ` Steven Rostedt
2022-03-11 15:23 ` Peter Zijlstra
2022-03-10 16:29 ` Peter Zijlstra
2022-03-11 10:40 ` Peter Zijlstra
2022-03-11 17:09 ` Alexei Starovoitov
2022-03-12 15:44 ` Peter Zijlstra
2022-03-13 1:33 ` Alexei Starovoitov
2022-03-13 8:52 ` Peter Zijlstra
2022-03-14 14:59 ` Peter Zijlstra
2022-03-15 8:15 ` Peter Zijlstra
2022-03-15 16:28 ` Masahiro Yamada
2022-03-17 19:44 ` Peter Zijlstra
2022-03-18 2:07 ` David Laight
2022-03-17 18:15 ` Masahiro Yamada
2022-03-17 19:52 ` Peter Zijlstra
2022-03-18 15:36 ` [tip: x86/core] kbuild: Fixup the IBT kbuild changes tip-bot2 for Peter Zijlstra
2022-03-18 16:15 ` Masahiro Yamada
2022-03-22 20:24 ` tip-bot2 for Peter Zijlstra
2022-03-15 16:26 ` [PATCH v4 00/45] x86: Kernel IBT Masahiro Yamada
2022-03-17 19:36 ` Peter Zijlstra
2022-03-14 15:33 ` Peter Zijlstra
2022-03-15 10:43 ` [tip: x86/core] x86: Annotate idtentry_df() tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` [tip: x86/core] x86,objtool: Move the ASM_REACHABLE annotation to objtool.h tip-bot2 for Peter Zijlstra
2022-03-15 10:43 ` [tip: x86/core] x86: Mark __invalid_creds() __noreturn tip-bot2 for Peter Zijlstra
2022-03-14 20:44 ` [PATCH v4 00/45] x86: Kernel IBT Kumar Kartikeya Dwivedi
2022-03-15 9:00 ` Peter Zijlstra
2022-03-15 10:05 ` Kumar Kartikeya Dwivedi
2022-03-15 10:07 ` Peter Zijlstra
2022-03-15 10:39 ` Peter Zijlstra
2022-03-16 9:35 ` Peter Zijlstra
2022-03-16 11:12 ` Kumar Kartikeya Dwivedi
2022-03-15 18:26 ` Alexei Starovoitov
2022-03-17 20:27 ` Peter Zijlstra
2022-03-11 14:40 ` [tip: x86/core] x86,ftrace: Fix modify_ftrace_direct() tip-bot2 for Peter Zijlstra
2022-03-10 0:30 ` [PATCH v4 00/45] x86: Kernel IBT Nick Desaulniers
2022-03-10 9:05 ` Peter Zijlstra
2022-03-10 9:22 ` David Laight
2022-03-10 10:16 ` Peter Zijlstra
2022-03-10 20:49 ` Nick Desaulniers
2022-03-11 14:40 ` [tip: x86/core] x86: Fix {int3,ibt}_selftest() vs LTO tip-bot2 for Peter Zijlstra
2022-03-08 20:06 ` [PATCH v4 00/45] x86: Kernel IBT Josh Poimboeuf
2022-03-09 6:57 ` Josh Poimboeuf
2022-03-09 13:37 ` David Laight
2022-03-10 14:27 ` Peter Zijlstra
2022-03-09 12:51 ` Miroslav Benes
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