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authorDave Martin <Dave.Martin@arm.com>2020-03-16 16:50:46 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2020-03-16 17:19:48 +0000
commitfe0f67660ee9c99408be5261ae045f8b41953b05 (patch)
tree77feaf03e85c305c35b45d870da4c473f1c0531e /fs/Kconfig.binfmt
parent8ef8f360cf30be12382f89ff48a57fbbd9b31c14 (diff)
elf: Allow arch to tweak initial mmap prot flags
An arch may want to tweak the mmap prot flags for an ELFexecutable's initial mappings. For example, arm64 is going to need to add PROT_BTI for executable pages in an ELF process whose executable is marked as using Branch Target Identification (an ARMv8.5-A control flow integrity feature). So that this can be done in a generic way, add a hook arch_elf_adjust_prot() to modify the prot flags as desired: arches can select CONFIG_HAVE_ELF_PROT and implement their own backend where necessary. By default, leave the prot flags unchanged. Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'fs/Kconfig.binfmt')
-rw-r--r--fs/Kconfig.binfmt3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index d2cfe0729a73..2358368319b8 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -36,6 +36,9 @@ config COMPAT_BINFMT_ELF
config ARCH_BINFMT_ELF_STATE
bool
+config ARCH_HAVE_ELF_PROT
+ bool
+
config ARCH_USE_GNU_PROPERTY
bool