linux-kernel - [PATCH v5 2/2] powerpc/64: Add module check for ELF ABI version

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Date:   Mon, 31 Oct 2022 22:07:33 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     linux-modules@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:     Nicholas Piggin <npiggin@...il.com>, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Jessica Yu <jeyu@...nel.org>,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH v5 2/2] powerpc/64: Add module check for ELF ABI version

Override the generic module ELF check to provide a check for the ELF ABI
version. This becomes important if we allow big-endian ELF ABI V2 builds
but it doesn't hurt to check now.

Cc: Jessica Yu <jeyu@...nel.org>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
[np: split patch, added changelog, adjust to Jessica's proposal]
Signed-off-by: Nicholas Piggin <npiggin@...il.com>
---
 arch/powerpc/kernel/module.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/powerpc/kernel/module.c b/arch/powerpc/kernel/module.c
index f6d6ae0a1692..d46bf9bfda26 100644
--- a/arch/powerpc/kernel/module.c
+++ b/arch/powerpc/kernel/module.c
@@ -19,6 +19,23 @@
 
 static LIST_HEAD(module_bug_list);
 
+#ifdef CONFIG_PPC64
+bool module_elf_check_arch(Elf_Ehdr *hdr)
+{
+	unsigned long abi_level = hdr->e_flags & 0x3;
+
+	if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2)) {
+		if (abi_level != 2)
+			return false;
+	} else {
+		if (abi_level >= 2)
+			return false;
+	}
+
+	return true;
+}
+#endif
+
 static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
 				    const Elf_Shdr *sechdrs,
 				    const char *name)
-- 
2.37.2