linux-kernel - [PATCH v2 2/2] x86/e820: fix the function type for e820__mapped

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Date:   Fri, 13 Nov 2020 16:23:06 -0800
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Kees Cook <keescook@...omium.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>
Subject: [PATCH v2 2/2] x86/e820: fix the function type for e820__mapped_all

e820__mapped_all is passed as a callback to is_mmconf_reserved, which
expects a function of type:

typedef bool (*check_reserved_t)(u64 start, u64 end, unsigned int type);

This trips indirect call checking with Clang's Control-Flow Integrity
(CFI). Change the last argument from enum e820_type to unsigned to fix
the type mismatch.

Reported-by: Sedat Dilek <sedat.dilek@...il.com>
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 arch/x86/include/asm/e820/api.h | 2 +-
 arch/x86/kernel/e820.c          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/e820/api.h b/arch/x86/include/asm/e820/api.h
index e8f58ddd06d9..a122ca2784b2 100644
--- a/arch/x86/include/asm/e820/api.h
+++ b/arch/x86/include/asm/e820/api.h
@@ -12,7 +12,7 @@ extern unsigned long pci_mem_start;
 
 extern bool e820__mapped_raw_any(u64 start, u64 end, enum e820_type type);
 extern bool e820__mapped_any(u64 start, u64 end, enum e820_type type);
-extern bool e820__mapped_all(u64 start, u64 end, enum e820_type type);
+extern bool e820__mapped_all(u64 start, u64 end, unsigned int type);
 
 extern void e820__range_add   (u64 start, u64 size, enum e820_type type);
 extern u64  e820__range_update(u64 start, u64 size, enum e820_type old_type, enum e820_type new_type);
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 22aad412f965..24b82ff53513 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -145,7 +145,7 @@ static struct e820_entry *__e820__mapped_all(u64 start, u64 end,
 /*
  * This function checks if the entire range <start,end> is mapped with type.
  */
-bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type)
+bool __init e820__mapped_all(u64 start, u64 end, unsigned int type)
 {
 	return __e820__mapped_all(start, end, type);
 }
-- 
2.29.2.299.gdc1121823c-goog