diff options
Diffstat (limited to 'arch/s390/mm/dump_pagetables.c')
| -rw-r--r-- | arch/s390/mm/dump_pagetables.c | 59 |
1 files changed, 40 insertions, 19 deletions
diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c index 9f9af5298dd6..ffd07ed7b4af 100644 --- a/arch/s390/mm/dump_pagetables.c +++ b/arch/s390/mm/dump_pagetables.c @@ -6,10 +6,11 @@ #include <linux/mm.h> #include <linux/kfence.h> #include <linux/kasan.h> -#include <asm/ptdump.h> #include <asm/kasan.h> +#include <asm/abs_lowcore.h> #include <asm/nospec-branch.h> #include <asm/sections.h> +#include <asm/maccess.h> static unsigned long max_addr; @@ -21,6 +22,8 @@ struct addr_marker { enum address_markers_idx { IDENTITY_BEFORE_NR = 0, IDENTITY_BEFORE_END_NR, + AMODE31_START_NR, + AMODE31_END_NR, KERNEL_START_NR, KERNEL_END_NR, #ifdef CONFIG_KFENCE @@ -29,21 +32,27 @@ enum address_markers_idx { #endif IDENTITY_AFTER_NR, IDENTITY_AFTER_END_NR, -#ifdef CONFIG_KASAN - KASAN_SHADOW_START_NR, - KASAN_SHADOW_END_NR, -#endif VMEMMAP_NR, VMEMMAP_END_NR, VMALLOC_NR, VMALLOC_END_NR, MODULES_NR, MODULES_END_NR, + ABS_LOWCORE_NR, + ABS_LOWCORE_END_NR, + MEMCPY_REAL_NR, + MEMCPY_REAL_END_NR, +#ifdef CONFIG_KASAN + KASAN_SHADOW_START_NR, + KASAN_SHADOW_END_NR, +#endif }; static struct addr_marker address_markers[] = { [IDENTITY_BEFORE_NR] = {0, "Identity Mapping Start"}, [IDENTITY_BEFORE_END_NR] = {(unsigned long)_stext, "Identity Mapping End"}, + [AMODE31_START_NR] = {0, "Amode31 Area Start"}, + [AMODE31_END_NR] = {0, "Amode31 Area End"}, [KERNEL_START_NR] = {(unsigned long)_stext, "Kernel Image Start"}, [KERNEL_END_NR] = {(unsigned long)_end, "Kernel Image End"}, #ifdef CONFIG_KFENCE @@ -52,16 +61,20 @@ static struct addr_marker address_markers[] = { #endif [IDENTITY_AFTER_NR] = {(unsigned long)_end, "Identity Mapping Start"}, [IDENTITY_AFTER_END_NR] = {0, "Identity Mapping End"}, -#ifdef CONFIG_KASAN - [KASAN_SHADOW_START_NR] = {KASAN_SHADOW_START, "Kasan Shadow Start"}, - [KASAN_SHADOW_END_NR] = {KASAN_SHADOW_END, "Kasan Shadow End"}, -#endif [VMEMMAP_NR] = {0, "vmemmap Area Start"}, [VMEMMAP_END_NR] = {0, "vmemmap Area End"}, [VMALLOC_NR] = {0, "vmalloc Area Start"}, [VMALLOC_END_NR] = {0, "vmalloc Area End"}, [MODULES_NR] = {0, "Modules Area Start"}, [MODULES_END_NR] = {0, "Modules Area End"}, + [ABS_LOWCORE_NR] = {0, "Lowcore Area Start"}, + [ABS_LOWCORE_END_NR] = {0, "Lowcore Area End"}, + [MEMCPY_REAL_NR] = {0, "Real Memory Copy Area Start"}, + [MEMCPY_REAL_END_NR] = {0, "Real Memory Copy Area End"}, +#ifdef CONFIG_KASAN + [KASAN_SHADOW_START_NR] = {KASAN_SHADOW_START, "Kasan Shadow Start"}, + [KASAN_SHADOW_END_NR] = {KASAN_SHADOW_END, "Kasan Shadow End"}, +#endif { -1, NULL } }; @@ -108,7 +121,6 @@ static void print_prot(struct seq_file *m, unsigned int pr, int level) static void note_prot_wx(struct pg_state *st, unsigned long addr) { -#ifdef CONFIG_DEBUG_WX if (!st->check_wx) return; if (st->current_prot & _PAGE_INVALID) @@ -125,10 +137,10 @@ static void note_prot_wx(struct pg_state *st, unsigned long addr) */ if (addr == PAGE_SIZE && (nospec_uses_trampoline() || !static_key_enabled(&cpu_has_bear))) return; - WARN_ONCE(1, "s390/mm: Found insecure W+X mapping at address %pS\n", + WARN_ONCE(IS_ENABLED(CONFIG_DEBUG_WX), + "s390/mm: Found insecure W+X mapping at address %pS\n", (void *)st->start_address); st->wx_pages += (addr - st->start_address) / PAGE_SIZE; -#endif /* CONFIG_DEBUG_WX */ } static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level, u64 val) @@ -180,8 +192,7 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level, } } -#ifdef CONFIG_DEBUG_WX -void ptdump_check_wx(void) +bool ptdump_check_wx(void) { struct pg_state st = { .ptdump = { @@ -204,16 +215,20 @@ void ptdump_check_wx(void) }; if (!MACHINE_HAS_NX) - return; + return true; ptdump_walk_pgd(&st.ptdump, &init_mm, NULL); - if (st.wx_pages) + if (st.wx_pages) { pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found\n", st.wx_pages); - else + + return false; + } else { pr_info("Checked W+X mappings: passed, no %sW+X pages found\n", (nospec_uses_trampoline() || !static_key_enabled(&cpu_has_bear)) ? "unexpected " : ""); + + return true; + } } -#endif /* CONFIG_DEBUG_WX */ #ifdef CONFIG_PTDUMP_DEBUGFS static int ptdump_show(struct seq_file *m, void *v) @@ -273,11 +288,17 @@ static int pt_dump_init(void) * kernel ASCE. We need this to keep the page table walker functions * from accessing non-existent entries. */ - max_addr = (S390_lowcore.kernel_asce & _REGION_ENTRY_TYPE_MASK) >> 2; + max_addr = (S390_lowcore.kernel_asce.val & _REGION_ENTRY_TYPE_MASK) >> 2; max_addr = 1UL << (max_addr * 11 + 31); address_markers[IDENTITY_AFTER_END_NR].start_address = ident_map_size; + address_markers[AMODE31_START_NR].start_address = (unsigned long)__samode31; + address_markers[AMODE31_END_NR].start_address = (unsigned long)__eamode31; address_markers[MODULES_NR].start_address = MODULES_VADDR; address_markers[MODULES_END_NR].start_address = MODULES_END; + address_markers[ABS_LOWCORE_NR].start_address = __abs_lowcore; + address_markers[ABS_LOWCORE_END_NR].start_address = __abs_lowcore + ABS_LOWCORE_MAP_SIZE; + address_markers[MEMCPY_REAL_NR].start_address = __memcpy_real_area; + address_markers[MEMCPY_REAL_END_NR].start_address = __memcpy_real_area + MEMCPY_REAL_SIZE; address_markers[VMEMMAP_NR].start_address = (unsigned long) vmemmap; address_markers[VMEMMAP_END_NR].start_address = (unsigned long)vmemmap + vmemmap_size; address_markers[VMALLOC_NR].start_address = VMALLOC_START; |