diff options
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/cpu_errata.c | 2 | ||||
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 9 | ||||
| -rw-r--r-- | arch/arm64/kernel/head.S | 1 | ||||
| -rw-r--r-- | arch/arm64/kernel/kaslr.c | 8 | ||||
| -rw-r--r-- | arch/arm64/kernel/machine_kexec_file.c | 4 |
5 files changed, 18 insertions, 6 deletions
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 09ac548c9d44..9950bb0cbd52 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -553,7 +553,7 @@ static const struct midr_range arm64_repeat_tlbi_cpus[] = { #endif #ifdef CONFIG_CAVIUM_ERRATUM_27456 -static const struct midr_range cavium_erratum_27456_cpus[] = { +const struct midr_range cavium_erratum_27456_cpus[] = { /* Cavium ThunderX, T88 pass 1.x - 2.1 */ MIDR_RANGE(MIDR_THUNDERX, 0, 0, 1, 1), /* Cavium ThunderX, T81 pass 1.0 */ diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 4f272399de89..f6d84e2c92fe 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -983,7 +983,7 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, /* Useful for KASLR robustness */ if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) - return true; + return kaslr_offset() > 0; /* Don't force KPTI for CPUs that are not vulnerable */ if (is_midr_in_range_list(read_cpuid_id(), kpti_safe_list)) @@ -1003,7 +1003,12 @@ kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused) static bool kpti_applied = false; int cpu = smp_processor_id(); - if (kpti_applied) + /* + * We don't need to rewrite the page-tables if either we've done + * it already or we have KASLR enabled and therefore have not + * created any global mappings at all. + */ + if (kpti_applied || kaslr_offset() > 0) return; remap_fn = (void *)__pa_symbol(idmap_kpti_install_ng_mappings); diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index c7213674cb24..15d79a8e5e5e 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -475,6 +475,7 @@ ENDPROC(__primary_switched) ENTRY(kimage_vaddr) .quad _text - TEXT_OFFSET +EXPORT_SYMBOL(kimage_vaddr) /* * If we're fortunate enough to boot at EL2, ensure that the world is diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c index f0e6ab8abe9c..ba6b41790fcd 100644 --- a/arch/arm64/kernel/kaslr.c +++ b/arch/arm64/kernel/kaslr.c @@ -14,6 +14,7 @@ #include <linux/sched.h> #include <linux/types.h> +#include <asm/cacheflush.h> #include <asm/fixmap.h> #include <asm/kernel-pgtable.h> #include <asm/memory.h> @@ -43,7 +44,7 @@ static __init u64 get_kaslr_seed(void *fdt) return ret; } -static __init const u8 *get_cmdline(void *fdt) +static __init const u8 *kaslr_get_cmdline(void *fdt) { static __initconst const u8 default_cmdline[] = CONFIG_CMDLINE; @@ -109,7 +110,7 @@ u64 __init kaslr_early_init(u64 dt_phys) * Check if 'nokaslr' appears on the command line, and * return 0 if that is the case. */ - cmdline = get_cmdline(fdt); + cmdline = kaslr_get_cmdline(fdt); str = strstr(cmdline, "nokaslr"); if (str == cmdline || (str > cmdline && *(str - 1) == ' ')) return 0; @@ -169,5 +170,8 @@ u64 __init kaslr_early_init(u64 dt_phys) module_alloc_base += (module_range * (seed & ((1 << 21) - 1))) >> 21; module_alloc_base &= PAGE_MASK; + __flush_dcache_area(&module_alloc_base, sizeof(module_alloc_base)); + __flush_dcache_area(&memstart_offset_seed, sizeof(memstart_offset_seed)); + return offset; } diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c index 10e33860e47a..f2c211a6229b 100644 --- a/arch/arm64/kernel/machine_kexec_file.c +++ b/arch/arm64/kernel/machine_kexec_file.c @@ -87,7 +87,9 @@ static int setup_dtb(struct kimage *image, /* add kaslr-seed */ ret = fdt_delprop(dtb, off, FDT_PROP_KASLR_SEED); - if (ret && (ret != -FDT_ERR_NOTFOUND)) + if (ret == -FDT_ERR_NOTFOUND) + ret = 0; + else if (ret) goto out; if (rng_is_initialized()) { |