Messages in this thread | | | Date | Wed, 5 Jan 2022 10:47:35 +0000 | From | Mark Rutland <> | Subject | Re: [PATCH] arm64: fix build error when use rodata_enabled |
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On Wed, Jan 05, 2022 at 02:51:05PM +0530, Anshuman Khandual wrote: > Hello, > > On 1/5/22 8:37 AM, AliOS system security wrote: > > rodata_enabled should be used when CONFIG_STRICT_KERNEL_RWX > > or CONFIG_STRICT_MODULE_RWX is selected
Further to Anshuman's comments here, for a build issue, please include the specific build error in the commit log, and describe the configuration where this manifests.
For the reasons Anshuman gives below I do not see how this can be a problem in mainline.
Thanks, Mark.
> Both these configs get selected invariably with CONFIG_ARM64 in the > platform config file (arch/arm64/Kconfig). I guess there can not be > any such situation, where both configs will be missing/not selected > given ARCH_OPTIONAL_KERNEL_RWX[or _DEFAULT] is not enabled on arm64. > > config ARM64 > def_bool y > select ACPI_CCA_REQUIRED if ACPI > ..... > select ARCH_HAS_STRICT_KERNEL_RWX > select ARCH_HAS_STRICT_MODULE_RWX > ..... > > Hence for all practical purpose, rodata_enabled could be considered > always available. I am sure there other similar situations as well, > where code elements are not wrapped around if the config option is > always present. > > > > > Signed-off-by: AliOS system security <alios_sys_security@linux.alibaba.com> > > Also please refer Documentation/process/submitting-patches.rst for > the rules regarding names, that can be used for a commit sign off. > > ------------------------------------------------------------------------ > then you just add a line saying:: > > Signed-off-by: Random J Developer <random@developer.example.org> > > using your real name (sorry, no pseudonyms or anonymous contributions.) > ------------------------------------------------------------------------ > > - Anshuman > > > --- > > arch/arm64/mm/mmu.c | 14 ++++++++++++-- > > 1 file changed, 12 insertions(+), 2 deletions(-) > > > > diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c > > index acfae9b..47f8754 100644 > > --- a/arch/arm64/mm/mmu.c > > +++ b/arch/arm64/mm/mmu.c > > @@ -596,6 +596,7 @@ static void __init map_kernel_segment(pgd_t *pgdp, void *va_start, void *va_end, > > vm_area_add_early(vma); > > } > > > > +#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) > > static int __init parse_rodata(char *arg) > > { > > int ret = strtobool(arg, &rodata_enabled); > > @@ -613,11 +614,16 @@ static int __init parse_rodata(char *arg) > > return 0; > > } > > early_param("rodata", parse_rodata); > > +#endif > > > > #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 > > static int __init map_entry_trampoline(void) > > { > > - pgprot_t prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC; > > + pgprot_t prot = PAGE_KERNEL_EXEC; > > +#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) > > + if (rodata_enabled) > > + prot = PAGE_KERNEL_ROX; > > +#endif > > phys_addr_t pa_start = __pa_symbol(__entry_tramp_text_start); > > > > /* The trampoline is always mapped and can therefore be global */ > > @@ -672,7 +678,11 @@ static void __init map_kernel(pgd_t *pgdp) > > * mapping to install SW breakpoints. Allow this (only) when > > * explicitly requested with rodata=off. > > */ > > - pgprot_t text_prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC; > > + pgprot_t text_prot = PAGE_KERNEL_EXEC; > > +#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) > > + if (rodata_enabled) > > + text_prot = PAGE_KERNEL_ROX; > > +#endif > > > > /* > > * If we have a CPU that supports BTI and a kernel built for > > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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