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52 lines
2.3 KiB
Diff
52 lines
2.3 KiB
Diff
From 783e9350713f9c62e52834e738cd85bafe4622cc Mon Sep 17 00:00:00 2001
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From: Jessica Yu <jeyu@kernel.org>
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Date: Tue, 1 Sep 2020 18:00:16 +0200
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Subject: [PATCH 5/5] arm64/module: set trampoline section flags regardless of
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CONFIG_DYNAMIC_FTRACE
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In the arm64 module linker script, the section .text.ftrace_trampoline
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is specified unconditionally regardless of whether CONFIG_DYNAMIC_FTRACE
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is enabled (this is simply due to the limitation that module linker
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scripts are not preprocessed like the vmlinux one).
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Normally, for .plt and .text.ftrace_trampoline, the section flags
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present in the module binary wouldn't matter since module_frob_arch_sections()
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would assign them manually anyway. However, the arm64 module loader only
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sets the section flags for .text.ftrace_trampoline when CONFIG_DYNAMIC_FTRACE=y.
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That's only become problematic recently due to a recent change in
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binutils-2.35, where the .text.ftrace_trampoline section (along with the
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.plt section) is now marked writable and executable (WAX).
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We no longer allow writable and executable sections to be loaded due to
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commit 5c3a7db0c7ec ("module: Harden STRICT_MODULE_RWX"), so this is
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causing all modules linked with binutils-2.35 to be rejected under arm64.
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Drop the IS_ENABLED(CONFIG_DYNAMIC_FTRACE) check in module_frob_arch_sections()
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so that the section flags for .text.ftrace_trampoline get properly set to
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SHF_EXECINSTR|SHF_ALLOC, without SHF_WRITE.
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Link: http://lore.kernel.org/r/20200831094651.GA16385@linux-8ccs
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Acked-by: Will Deacon <will@kernel.org>
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Signed-off-by: Jessica Yu <jeyu@kernel.org>
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Acked-by: Ard Biesheuvel <ardb@kernel.org>
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---
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arch/arm64/kernel/module-plts.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/arch/arm64/kernel/module-plts.c b/arch/arm64/kernel/module-plts.c
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index 65b08a74aec6..37c0b51a7b7b 100644
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--- a/arch/arm64/kernel/module-plts.c
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+++ b/arch/arm64/kernel/module-plts.c
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@@ -271,8 +271,7 @@ int module_frob_arch_sections(Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
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mod->arch.core.plt_shndx = i;
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else if (!strcmp(secstrings + sechdrs[i].sh_name, ".init.plt"))
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mod->arch.init.plt_shndx = i;
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- else if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE) &&
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- !strcmp(secstrings + sechdrs[i].sh_name,
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+ else if (!strcmp(secstrings + sechdrs[i].sh_name,
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".text.ftrace_trampoline"))
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tramp = sechdrs + i;
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else if (sechdrs[i].sh_type == SHT_SYMTAB)
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--
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2.27.0
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