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authorBarry Song <song.bao.hua@hisilicon.com>2021-07-30 15:51:31 +0300
committerWill Deacon <will@kernel.org>2021-08-03 12:36:42 +0300
commitf9c4ff2ab9fe433d44ebbc2e3c2368a49df44798 (patch)
tree52fdeb8ee023e4378c6a54cd8b63f6a9b63625fb /arch
parent64ee84c75b5f75132eec97f2c7a201a056d53698 (diff)
downloadlinux-f9c4ff2ab9fe433d44ebbc2e3c2368a49df44798.tar.xz
arm64: fix the doc of RANDOMIZE_MODULE_REGION_FULL
Obviously kaslr is setting the module region to 2GB rather than 4GB since commit b2eed9b588112 ("arm64/kernel: kaslr: reduce module randomization range to 2 GB"). So fix the size of region in Kconfig. On the other hand, even though RANDOMIZE_MODULE_REGION_FULL is not set, module_alloc() can fall back to a 2GB window if ARM64_MODULE_PLTS is set. In this case, veneers are still needed. !RANDOMIZE_MODULE_REGION_FULL doesn't necessarily mean veneers are not needed. So fix the doc to be more precise to avoid any confusion to the readers of the code. Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Ard Biesheuvel <ard.biesheuvel@arm.com> Cc: Qi Liu <liuqi115@huawei.com> Signed-off-by: Barry Song <song.bao.hua@hisilicon.com> Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Link: https://lore.kernel.org/r/20210730125131.13724-1-song.bao.hua@hisilicon.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/Kconfig9
-rw-r--r--arch/arm64/kernel/kaslr.c4
2 files changed, 9 insertions, 4 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index b5b13a932561..fdcd54d39c1e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1800,11 +1800,11 @@ config RANDOMIZE_BASE
If unsure, say N.
config RANDOMIZE_MODULE_REGION_FULL
- bool "Randomize the module region over a 4 GB range"
+ bool "Randomize the module region over a 2 GB range"
depends on RANDOMIZE_BASE
default y
help
- Randomizes the location of the module region inside a 4 GB window
+ Randomizes the location of the module region inside a 2 GB window
covering the core kernel. This way, it is less likely for modules
to leak information about the location of core kernel data structures
but it does imply that function calls between modules and the core
@@ -1812,7 +1812,10 @@ config RANDOMIZE_MODULE_REGION_FULL
When this option is not set, the module region will be randomized over
a limited range that contains the [_stext, _etext] interval of the
- core kernel, so branch relocations are always in range.
+ core kernel, so branch relocations are almost always in range unless
+ ARM64_MODULE_PLTS is enabled and the region is exhausted. In this
+ particular case of region exhaustion, modules might be able to fall
+ back to a larger 2GB area.
config CC_HAVE_STACKPROTECTOR_SYSREG
def_bool $(cc-option,-mstack-protector-guard=sysreg -mstack-protector-guard-reg=sp_el0 -mstack-protector-guard-offset=0)
diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c
index cfa2cfde3019..418b2bba1521 100644
--- a/arch/arm64/kernel/kaslr.c
+++ b/arch/arm64/kernel/kaslr.c
@@ -162,7 +162,9 @@ u64 __init kaslr_early_init(void)
* a PAGE_SIZE multiple in the range [_etext - MODULES_VSIZE,
* _stext) . This guarantees that the resulting region still
* covers [_stext, _etext], and that all relative branches can
- * be resolved without veneers.
+ * be resolved without veneers unless this region is exhausted
+ * and we fall back to a larger 2GB window in module_alloc()
+ * when ARM64_MODULE_PLTS is enabled.
*/
module_range = MODULES_VSIZE - (u64)(_etext - _stext);
module_alloc_base = (u64)_etext + offset - MODULES_VSIZE;