diff options
| -rw-r--r-- | arch/arm64/Kconfig | 11 | ||||
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 8 | ||||
| -rw-r--r-- | arch/arm64/include/asm/mman.h | 36 | ||||
| -rw-r--r-- | arch/arm64/include/asm/mmu_context.h | 30 | ||||
| -rw-r--r-- | arch/arm64/kernel/pi/idreg-override.c | 4 | ||||
| -rw-r--r-- | arch/arm64/kernel/pi/map_kernel.c | 23 | ||||
| -rw-r--r-- | arch/arm64/mm/proc.S | 6 |
7 files changed, 116 insertions, 2 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 160856de9bbb..7761ffc6dbcf 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1608,6 +1608,17 @@ config RODATA_FULL_DEFAULT_ENABLED This requires the linear region to be mapped down to pages, which may adversely affect performance in some cases. +config ARM64_WXN + bool "Enable WXN attribute so all writable mappings are non-exec" + help + Set the WXN bit in the SCTLR system register so that all writable + mappings are treated as if the PXN/UXN bit is set as well. + If this is set to Y, it can still be disabled at runtime by + passing 'arm64.nowxn' on the kernel command line. + + This should only be set if no software needs to be supported that + relies on being able to execute from writable mappings. + config ARM64_SW_TTBR0_PAN bool "Emulate Privileged Access Never using TTBR0_EL1 switching" help diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index a8f97690ce1f..ee33b7e52da7 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -18,6 +18,7 @@ #define ARM64_SW_FEATURE_OVERRIDE_NOKASLR 0 #define ARM64_SW_FEATURE_OVERRIDE_HVHE 4 #define ARM64_SW_FEATURE_OVERRIDE_RODATA_OFF 8 +#define ARM64_SW_FEATURE_OVERRIDE_NOWXN 12 #ifndef __ASSEMBLY__ @@ -962,6 +963,13 @@ static inline bool kaslr_disabled_cmdline(void) return arm64_test_sw_feature_override(ARM64_SW_FEATURE_OVERRIDE_NOKASLR); } +static inline bool arm64_wxn_enabled(void) +{ + if (!IS_ENABLED(CONFIG_ARM64_WXN)) + return false; + return !arm64_test_sw_feature_override(ARM64_SW_FEATURE_OVERRIDE_NOWXN); +} + u32 get_kvm_ipa_limit(void); void dump_cpu_features(void); diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h index 5966ee4a6154..6d4940342ba7 100644 --- a/arch/arm64/include/asm/mman.h +++ b/arch/arm64/include/asm/mman.h @@ -35,11 +35,40 @@ static inline unsigned long arch_calc_vm_flag_bits(unsigned long flags) } #define arch_calc_vm_flag_bits(flags) arch_calc_vm_flag_bits(flags) +static inline bool arm64_check_wx_prot(unsigned long prot, + struct task_struct *tsk) +{ + /* + * When we are running with SCTLR_ELx.WXN==1, writable mappings are + * implicitly non-executable. This means we should reject such mappings + * when user space attempts to create them using mmap() or mprotect(). + */ + if (arm64_wxn_enabled() && + ((prot & (PROT_WRITE | PROT_EXEC)) == (PROT_WRITE | PROT_EXEC))) { + /* + * User space libraries such as libffi carry elaborate + * heuristics to decide whether it is worth it to even attempt + * to create writable executable mappings, as PaX or selinux + * enabled systems will outright reject it. They will usually + * fall back to something else (e.g., two separate shared + * mmap()s of a temporary file) on failure. + */ + pr_info_ratelimited( + "process %s (%d) attempted to create PROT_WRITE+PROT_EXEC mapping\n", + tsk->comm, tsk->pid); + return false; + } + return true; +} + static inline bool arch_validate_prot(unsigned long prot, unsigned long addr __always_unused) { unsigned long supported = PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM; + if (!arm64_check_wx_prot(prot, current)) + return false; + if (system_supports_bti()) supported |= PROT_BTI; @@ -50,6 +79,13 @@ static inline bool arch_validate_prot(unsigned long prot, } #define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr) +static inline bool arch_validate_mmap_prot(unsigned long prot, + unsigned long addr) +{ + return arm64_check_wx_prot(prot, current); +} +#define arch_validate_mmap_prot arch_validate_mmap_prot + static inline bool arch_validate_flags(unsigned long vm_flags) { if (!system_supports_mte()) diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h index c768d16b81a4..f0fe2d09d139 100644 --- a/arch/arm64/include/asm/mmu_context.h +++ b/arch/arm64/include/asm/mmu_context.h @@ -20,13 +20,41 @@ #include <asm/cpufeature.h> #include <asm/daifflags.h> #include <asm/proc-fns.h> -#include <asm-generic/mm_hooks.h> #include <asm/cputype.h> #include <asm/sysreg.h> #include <asm/tlbflush.h> extern bool rodata_full; +static inline int arch_dup_mmap(struct mm_struct *oldmm, + struct mm_struct *mm) +{ + return 0; +} + +static inline void arch_exit_mmap(struct mm_struct *mm) +{ +} + +static inline void arch_unmap(struct mm_struct *mm, + unsigned long start, unsigned long end) +{ +} + +static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, + bool write, bool execute, bool foreign) +{ + if (IS_ENABLED(CONFIG_ARM64_WXN) && execute && + (vma->vm_flags & (VM_WRITE | VM_EXEC)) == (VM_WRITE | VM_EXEC)) { + pr_warn_ratelimited( + "process %s (%d) attempted to execute from writable memory\n", + current->comm, current->pid); + /* disallow unless the nowxn override is set */ + return !arm64_wxn_enabled(); + } + return true; +} + static inline void contextidr_thread_switch(struct task_struct *next) { if (!IS_ENABLED(CONFIG_PID_IN_CONTEXTIDR)) diff --git a/arch/arm64/kernel/pi/idreg-override.c b/arch/arm64/kernel/pi/idreg-override.c index aad399796e81..bccfee34f62f 100644 --- a/arch/arm64/kernel/pi/idreg-override.c +++ b/arch/arm64/kernel/pi/idreg-override.c @@ -189,6 +189,7 @@ static const struct ftr_set_desc sw_features __prel64_initconst = { FIELD("nokaslr", ARM64_SW_FEATURE_OVERRIDE_NOKASLR, NULL), FIELD("hvhe", ARM64_SW_FEATURE_OVERRIDE_HVHE, hvhe_filter), FIELD("rodataoff", ARM64_SW_FEATURE_OVERRIDE_RODATA_OFF, NULL), + FIELD("nowxn", ARM64_SW_FEATURE_OVERRIDE_NOWXN, NULL), {} }, }; @@ -221,8 +222,9 @@ static const struct { { "arm64.nomops", "id_aa64isar2.mops=0" }, { "arm64.nomte", "id_aa64pfr1.mte=0" }, { "nokaslr", "arm64_sw.nokaslr=1" }, - { "rodata=off", "arm64_sw.rodataoff=1" }, + { "rodata=off", "arm64_sw.rodataoff=1 arm64_sw.nowxn=1" }, { "arm64.nolva", "id_aa64mmfr2.varange=0" }, + { "arm64.nowxn", "arm64_sw.nowxn=1" }, }; static int __init parse_hexdigit(const char *p, u64 *v) diff --git a/arch/arm64/kernel/pi/map_kernel.c b/arch/arm64/kernel/pi/map_kernel.c index 5fa08e13e17e..cac1e1f63c44 100644 --- a/arch/arm64/kernel/pi/map_kernel.c +++ b/arch/arm64/kernel/pi/map_kernel.c @@ -132,6 +132,25 @@ static void __init map_kernel(u64 kaslr_offset, u64 va_offset, int root_level) idmap_cpu_replace_ttbr1(swapper_pg_dir); } +static void noinline __section(".idmap.text") disable_wxn(void) +{ + u64 sctlr = read_sysreg(sctlr_el1) & ~SCTLR_ELx_WXN; + + /* + * We cannot safely clear the WXN bit while the MMU and caches are on, + * so turn the MMU off, flush the TLBs and turn it on again but with + * the WXN bit cleared this time. + */ + asm(" msr sctlr_el1, %0 ;" + " isb ;" + " tlbi vmalle1 ;" + " dsb nsh ;" + " isb ;" + " msr sctlr_el1, %1 ;" + " isb ;" + :: "r"(sctlr & ~SCTLR_ELx_M), "r"(sctlr)); +} + static void noinline __section(".idmap.text") set_ttbr0_for_lpa2(u64 ttbr) { u64 sctlr = read_sysreg(sctlr_el1); @@ -229,6 +248,10 @@ asmlinkage void __init early_map_kernel(u64 boot_status, void *fdt) if (va_bits > VA_BITS_MIN) sysreg_clear_set(tcr_el1, TCR_T1SZ_MASK, TCR_T1SZ(va_bits)); + if (IS_ENABLED(CONFIG_ARM64_WXN) && + arm64_test_sw_feature_override(ARM64_SW_FEATURE_OVERRIDE_NOWXN)) + disable_wxn(); + /* * The virtual KASLR displacement modulo 2MiB is decided by the * physical placement of the image, as otherwise, we might not be able diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index 9d40f3ffd8d2..bfd2ad896108 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -546,6 +546,12 @@ alternative_else_nop_endif * Prepare SCTLR */ mov_q x0, INIT_SCTLR_EL1_MMU_ON +#ifdef CONFIG_ARM64_WXN + ldr_l x1, arm64_sw_feature_override + FTR_OVR_VAL_OFFSET + tst x1, #0xf << ARM64_SW_FEATURE_OVERRIDE_NOWXN + orr x1, x0, #SCTLR_ELx_WXN + csel x0, x0, x1, ne +#endif ret // return to head.S .unreq mair |