mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
synced 2024-12-08 23:03:46 +00:00
52 lines
2.3 KiB
Diff
52 lines
2.3 KiB
Diff
|
From 783e9350713f9c62e52834e738cd85bafe4622cc Mon Sep 17 00:00:00 2001
|
||
|
|
From: Jessica Yu <jeyu@kernel.org>
|
||
|
|
Date: Tue, 1 Sep 2020 18:00:16 +0200
|
||
|
|
Subject: [PATCH 5/5] arm64/module: set trampoline section flags regardless of
|
||
|
|
CONFIG_DYNAMIC_FTRACE
|
||
|
|
|
||
|
|
In the arm64 module linker script, the section .text.ftrace_trampoline
|
||
|
|
is specified unconditionally regardless of whether CONFIG_DYNAMIC_FTRACE
|
||
|
|
is enabled (this is simply due to the limitation that module linker
|
||
|
|
scripts are not preprocessed like the vmlinux one).
|
||
|
|
|
||
|
|
Normally, for .plt and .text.ftrace_trampoline, the section flags
|
||
|
|
present in the module binary wouldn't matter since module_frob_arch_sections()
|
||
|
|
would assign them manually anyway. However, the arm64 module loader only
|
||
|
|
sets the section flags for .text.ftrace_trampoline when CONFIG_DYNAMIC_FTRACE=y.
|
||
|
|
That's only become problematic recently due to a recent change in
|
||
|
|
binutils-2.35, where the .text.ftrace_trampoline section (along with the
|
||
|
|
.plt section) is now marked writable and executable (WAX).
|
||
|
|
|
||
|
|
We no longer allow writable and executable sections to be loaded due to
|
||
|
|
commit 5c3a7db0c7ec ("module: Harden STRICT_MODULE_RWX"), so this is
|
||
|
|
causing all modules linked with binutils-2.35 to be rejected under arm64.
|
||
|
|
Drop the IS_ENABLED(CONFIG_DYNAMIC_FTRACE) check in module_frob_arch_sections()
|
||
|
|
so that the section flags for .text.ftrace_trampoline get properly set to
|
||
|
|
SHF_EXECINSTR|SHF_ALLOC, without SHF_WRITE.
|
||
|
|
|
||
|
|
Link: http://lore.kernel.org/r/20200831094651.GA16385@linux-8ccs
|
||
|
|
Acked-by: Will Deacon <will@kernel.org>
|
||
|
|
Signed-off-by: Jessica Yu <jeyu@kernel.org>
|
||
|
|
Acked-by: Ard Biesheuvel <ardb@kernel.org>
|
||
|
|
---
|
||
|
|
arch/arm64/kernel/module-plts.c | 3 +--
|
||
|
|
1 file changed, 1 insertion(+), 2 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/arch/arm64/kernel/module-plts.c b/arch/arm64/kernel/module-plts.c
|
||
|
|
index 65b08a74aec6..37c0b51a7b7b 100644
|
||
|
|
--- a/arch/arm64/kernel/module-plts.c
|
||
|
|
+++ b/arch/arm64/kernel/module-plts.c
|
||
|
|
@@ -271,8 +271,7 @@ int module_frob_arch_sections(Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
|
||
|
|
mod->arch.core.plt_shndx = i;
|
||
|
|
else if (!strcmp(secstrings + sechdrs[i].sh_name, ".init.plt"))
|
||
|
|
mod->arch.init.plt_shndx = i;
|
||
|
|
- else if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE) &&
|
||
|
|
- !strcmp(secstrings + sechdrs[i].sh_name,
|
||
|
|
+ else if (!strcmp(secstrings + sechdrs[i].sh_name,
|
||
|
|
".text.ftrace_trampoline"))
|
||
|
|
tramp = sechdrs + i;
|
||
|
|
else if (sechdrs[i].sh_type == SHT_SYMTAB)
|
||
|
|
--
|
||
|
|
2.27.0
|
||
|
|
|