linux-kernel - [tip: x86/core] x86/alternatives: Provide text_poke_copy

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Message-ID: <166601842806.401.11281852653540224244.tip-bot2@tip-bot2>
Date:   Mon, 17 Oct 2022 14:53:48 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/core] x86/alternatives: Provide text_poke_copy_locked()

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     fe54d0793796ccdb213d8ea7bff0b49903b6afaa
Gitweb:        https://git.kernel.org/tip/fe54d0793796ccdb213d8ea7bff0b49903b6afaa
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Thu, 15 Sep 2022 13:11:20 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 17 Oct 2022 16:41:11 +02:00

x86/alternatives: Provide text_poke_copy_locked()

The upcoming call thunk patching must hold text_mutex and needs access to
text_poke_copy(), which takes text_mutex.

Provide a _locked postfixed variant to expose the inner workings.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20220915111147.159977224@infradead.org
---
 arch/x86/include/asm/text-patching.h |  1 +-
 arch/x86/kernel/alternative.c        | 37 ++++++++++++++++-----------
 2 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/arch/x86/include/asm/text-patching.h b/arch/x86/include/asm/text-patching.h
index 1cc1552..f4b87f0 100644
--- a/arch/x86/include/asm/text-patching.h
+++ b/arch/x86/include/asm/text-patching.h
@@ -45,6 +45,7 @@ extern void *text_poke(void *addr, const void *opcode, size_t len);
 extern void text_poke_sync(void);
 extern void *text_poke_kgdb(void *addr, const void *opcode, size_t len);
 extern void *text_poke_copy(void *addr, const void *opcode, size_t len);
+extern void *text_poke_copy_locked(void *addr, const void *opcode, size_t len, bool core_ok);
 extern void *text_poke_set(void *addr, int c, size_t len);
 extern int poke_int3_handler(struct pt_regs *regs);
 extern void text_poke_bp(void *addr, const void *opcode, size_t len, const void *emulate);
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 5cadcea..fad3c0e 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -1236,27 +1236,15 @@ void *text_poke_kgdb(void *addr, const void *opcode, size_t len)
 	return __text_poke(text_poke_memcpy, addr, opcode, len);
 }
 
-/**
- * text_poke_copy - Copy instructions into (an unused part of) RX memory
- * @addr: address to modify
- * @opcode: source of the copy
- * @len: length to copy, could be more than 2x PAGE_SIZE
- *
- * Not safe against concurrent execution; useful for JITs to dump
- * new code blocks into unused regions of RX memory. Can be used in
- * conjunction with synchronize_rcu_tasks() to wait for existing
- * execution to quiesce after having made sure no existing functions
- * pointers are live.
- */
-void *text_poke_copy(void *addr, const void *opcode, size_t len)
+void *text_poke_copy_locked(void *addr, const void *opcode, size_t len,
+			    bool core_ok)
 {
 	unsigned long start = (unsigned long)addr;
 	size_t patched = 0;
 
-	if (WARN_ON_ONCE(core_kernel_text(start)))
+	if (WARN_ON_ONCE(!core_ok && core_kernel_text(start)))
 		return NULL;
 
-	mutex_lock(&text_mutex);
 	while (patched < len) {
 		unsigned long ptr = start + patched;
 		size_t s;
@@ -1266,6 +1254,25 @@ void *text_poke_copy(void *addr, const void *opcode, size_t len)
 		__text_poke(text_poke_memcpy, (void *)ptr, opcode + patched, s);
 		patched += s;
 	}
+	return addr;
+}
+
+/**
+ * text_poke_copy - Copy instructions into (an unused part of) RX memory
+ * @addr: address to modify
+ * @opcode: source of the copy
+ * @len: length to copy, could be more than 2x PAGE_SIZE
+ *
+ * Not safe against concurrent execution; useful for JITs to dump
+ * new code blocks into unused regions of RX memory. Can be used in
+ * conjunction with synchronize_rcu_tasks() to wait for existing
+ * execution to quiesce after having made sure no existing functions
+ * pointers are live.
+ */
+void *text_poke_copy(void *addr, const void *opcode, size_t len)
+{
+	mutex_lock(&text_mutex);
+	addr = text_poke_copy_locked(addr, opcode, len, false);
 	mutex_unlock(&text_mutex);
 	return addr;
 }