linux-kernel - [PATCH] sections: Fix __is_kernel() to include init ranges

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Date:   Fri, 7 Jan 2022 01:13:02 +0100
From:   Helge Deller <deller@....de>
To:     Linux Kernel <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org
Cc:     linux-parisc@...r.kernel.org
Subject: [PATCH] sections: Fix __is_kernel() to include init ranges

With CONFIG_KALLSYMS_ALL=y, the function is_ksym_addr() is used to
determine if a symbol is from inside the kernel range. For that the
given symbol address is checked if it's inside the _stext to _end range.

Although this is correct, some architectures (e.g. parisc) may have the
init area before the _stext address and as such the check in
is_ksym_addr() fails.  By extending the range check to include the init
section, __is_kernel() will now detect symbols in this range as well.

This fixes an issue on parisc where addresses of kernel functions in
init sections aren't resolved to their symbol names.

Signed-off-by: Helge Deller <deller@....de>

diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index 1dfadb2e878d..00566b1fd699 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -193,12 +193,16 @@ static inline bool __is_kernel_text(unsigned long addr)
  * @addr: address to check
  *
  * Returns: true if the address is located in the kernel range, false otherwise.
- * Note: an internal helper, only check the range of _stext to _end.
+ * Note: an internal helper, check the range of _stext to _end,
+ *       and range from __init_begin to __init_end, which can be outside
+ *       of the _stext to _end range.
  */
 static inline bool __is_kernel(unsigned long addr)
 {
-	return addr >= (unsigned long)_stext &&
-	       addr < (unsigned long)_end;
+	return ((addr >= (unsigned long)_stext &&
+	         addr < (unsigned long)_end) ||
+		(addr >= (unsigned long)__init_begin &&
+		 addr < (unsigned long)__init_end));
 }

 #endif /* _ASM_GENERIC_SECTIONS_H_ */