| Message ID | 20200422165537.26883-1-laanwj@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | riscv: disable ARCH_HAS_STRICT_KERNEL_RWX for nommu builds | expand |
On Wed, Apr 22, 2020 at 9:56 AM Wladimir J. van der Laan <laanwj@gmail.com> wrote: > > From: "Wladimir J. van der Laan" <laanwj@protonmail.com> > > For non-MMU systems, which tend to be low-memory SoCs such as the K210, > it's expensive to align sections to 2MB. Besides that, the security > guarantees cannot be made anyway. > --- > arch/riscv/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > index 62f7bfeb709eb1cdabaccce261320dd0191b3c48..74f82cf4f7816b99fc54155fd40dcf4d40cbf956 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -60,7 +60,7 @@ config RISCV > select ARCH_HAS_GIGANTIC_PAGE > select ARCH_HAS_SET_DIRECT_MAP > select ARCH_HAS_SET_MEMORY > - select ARCH_HAS_STRICT_KERNEL_RWX > + select ARCH_HAS_STRICT_KERNEL_RWX if MMU > select ARCH_WANT_HUGE_PMD_SHARE if 64BIT > select SPARSEMEM_STATIC if 32BIT > select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU > -- > 2.17.1 > > This fix is already available in the mailing list from Damien. https://patchwork.kernel.org/patch/11485305/
On Wed, 22 Apr 2020 09:55:37 PDT (-0700), laanwj@gmail.com wrote: > From: "Wladimir J. van der Laan" <laanwj@protonmail.com> > > For non-MMU systems, which tend to be low-memory SoCs such as the K210, > it's expensive to align sections to 2MB. Besides that, the security > guarantees cannot be made anyway. > --- > arch/riscv/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > index 62f7bfeb709eb1cdabaccce261320dd0191b3c48..74f82cf4f7816b99fc54155fd40dcf4d40cbf956 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -60,7 +60,7 @@ config RISCV > select ARCH_HAS_GIGANTIC_PAGE > select ARCH_HAS_SET_DIRECT_MAP > select ARCH_HAS_SET_MEMORY > - select ARCH_HAS_STRICT_KERNEL_RWX > + select ARCH_HAS_STRICT_KERNEL_RWX if MMU > select ARCH_WANT_HUGE_PMD_SHARE if 64BIT > select SPARSEMEM_STATIC if 32BIT > select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU I took Damien's version because it was posted first. It had missed my inbox, so thanks for pointing this out.
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 62f7bfeb709eb1cdabaccce261320dd0191b3c48..74f82cf4f7816b99fc54155fd40dcf4d40cbf956 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -60,7 +60,7 @@ config RISCV select ARCH_HAS_GIGANTIC_PAGE select ARCH_HAS_SET_DIRECT_MAP select ARCH_HAS_SET_MEMORY - select ARCH_HAS_STRICT_KERNEL_RWX + select ARCH_HAS_STRICT_KERNEL_RWX if MMU select ARCH_WANT_HUGE_PMD_SHARE if 64BIT select SPARSEMEM_STATIC if 32BIT select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
From: "Wladimir J. van der Laan" <laanwj@protonmail.com> For non-MMU systems, which tend to be low-memory SoCs such as the K210, it's expensive to align sections to 2MB. Besides that, the security guarantees cannot be made anyway. --- arch/riscv/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)