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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/x86/kernel/kprobes/opt.c
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@@ -15,6 +15,7 @@
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 #include <linux/extable.h>
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 #include <linux/kdebug.h>
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 #include <linux/kallsyms.h>
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+#include <linux/kgdb.h>
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 #include <linux/ftrace.h>
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 #include <linux/objtool.h>
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 #include <linux/pgtable.h>
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@@ -45,8 +46,8 @@
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 		/* This function only handles jump-optimized kprobe */
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 		if (kp && kprobe_optimized(kp)) {
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 			op = container_of(kp, struct optimized_kprobe, kp);
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-			/* If op->list is not empty, op is under optimizing */
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-			if (list_empty(&op->list))
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+			/* If op is optimized or under unoptimizing */
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+			if (list_empty(&op->list) || optprobe_queued_unopt(op))
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 				goto found;
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 		}
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 	}
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@@ -277,19 +278,6 @@
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 	return ret;
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 }
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-static bool is_padding_int3(unsigned long addr, unsigned long eaddr)
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-{
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-	unsigned char ops;
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-
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-	for (; addr < eaddr; addr++) {
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-		if (get_kernel_nofault(ops, (void *)addr) < 0 ||
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-		    ops != INT3_INSN_OPCODE)
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-			return false;
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-	}
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-
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-	return true;
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-}
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-
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 /* Decode whole function to ensure any instructions don't jump into target */
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 static int can_optimize(unsigned long paddr)
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 {
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@@ -317,6 +305,8 @@
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 	addr = paddr - offset;
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 	while (addr < paddr - offset + size) { /* Decode until function end */
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 		unsigned long recovered_insn;
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+		int ret;
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+
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 		if (search_exception_tables(addr))
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 			/*
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 			 * Since some fixup code will jumps into this function,
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@@ -326,16 +316,19 @@
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 		recovered_insn = recover_probed_instruction(buf, addr);
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 		if (!recovered_insn)
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 			return 0;
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-		kernel_insn_init(&insn, (void *)recovered_insn, MAX_INSN_SIZE);
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-		insn_get_length(&insn);
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-		/*
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-		 * In the case of detecting unknown breakpoint, this could be
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-		 * a padding INT3 between functions. Let's check that all the
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-		 * rest of the bytes are also INT3.
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-		 */
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-		if (insn.opcode.bytes[0] == INT3_INSN_OPCODE)
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-			return is_padding_int3(addr, paddr - offset + size) ? 1 : 0;
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+		ret = insn_decode(&insn, (void *)recovered_insn, MAX_INSN_SIZE, INSN_MODE_KERN);
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+		if (ret < 0)
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+			return 0;
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+#ifdef CONFIG_KGDB
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+		/*
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+		 * If there is a dynamically installed kgdb sw breakpoint,
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+		 * this function should not be probed.
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+		 */
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+		if (insn.opcode.bytes[0] == INT3_INSN_OPCODE &&
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+		    kgdb_has_hit_break(addr))
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+			return 0;
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+#endif
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 		/* Recover address */
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 		insn.kaddr = (void *)addr;
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 		insn.next_byte = (void *)(addr + insn.length);
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@@ -358,7 +351,7 @@
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 	for (i = 1; i < op->optinsn.size; i++) {
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 		p = get_kprobe(op->kp.addr + i);
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-		if (p && !kprobe_disabled(p))
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+		if (p && !kprobe_disarmed(p))
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 			return -EEXIST;
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 	}
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