diff options
Diffstat (limited to 'arch/powerpc/mm/init-common.c')
| -rw-r--r-- | arch/powerpc/mm/init-common.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c index 42ef7a6e6098..d3a7726ecf51 100644 --- a/arch/powerpc/mm/init-common.c +++ b/arch/powerpc/mm/init-common.c @@ -17,9 +17,10 @@ #undef DEBUG #include <linux/string.h> +#include <linux/pgtable.h> #include <asm/pgalloc.h> -#include <asm/pgtable.h> #include <asm/kup.h> +#include <asm/smp.h> phys_addr_t memstart_addr __ro_after_init = (phys_addr_t)~0ull; EXPORT_SYMBOL_GPL(memstart_addr); @@ -28,11 +29,14 @@ EXPORT_SYMBOL_GPL(kernstart_addr); unsigned long kernstart_virt_addr __ro_after_init = KERNELBASE; EXPORT_SYMBOL_GPL(kernstart_virt_addr); -static bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP); -static bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP); +bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP); +bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP); static int __init parse_nosmep(char *p) { + if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64)) + return 0; + disable_kuep = true; pr_warn("Disabling Kernel Userspace Execution Prevention\n"); return 0; @@ -47,10 +51,21 @@ static int __init parse_nosmap(char *p) } early_param("nosmap", parse_nosmap); -void __ref setup_kup(void) +void __weak setup_kuep(bool disabled) +{ + if (!IS_ENABLED(CONFIG_PPC_KUEP) || disabled) + return; + + if (smp_processor_id() != boot_cpuid) + return; + + pr_info("Activating Kernel Userspace Execution Prevention\n"); +} + +void setup_kup(void) { - setup_kuep(disable_kuep); setup_kuap(disable_kuap); + setup_kuep(disable_kuep); } #define CTOR(shift) static void ctor_##shift(void *addr) \ @@ -111,7 +126,7 @@ void pgtable_cache_add(unsigned int shift) * as to leave enough 0 bits in the address to contain it. */ unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1, HUGEPD_SHIFT_MASK + 1); - struct kmem_cache *new; + struct kmem_cache *new = NULL; /* It would be nice if this was a BUILD_BUG_ON(), but at the * moment, gcc doesn't seem to recognize is_power_of_2 as a @@ -124,7 +139,8 @@ void pgtable_cache_add(unsigned int shift) align = max_t(unsigned long, align, minalign); name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift); - new = kmem_cache_create(name, table_size, align, 0, ctor(shift)); + if (name) + new = kmem_cache_create(name, table_size, align, 0, ctor(shift)); if (!new) panic("Could not allocate pgtable cache for order %d", shift); |