diff options
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/elf.h | 3 | ||||
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 7 | ||||
| -rw-r--r-- | arch/arm64/kernel/sys.c | 10 |
3 files changed, 17 insertions, 3 deletions
diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h index 24ed037f09fd..7a09c48c0475 100644 --- a/arch/arm64/include/asm/elf.h +++ b/arch/arm64/include/asm/elf.h @@ -177,7 +177,8 @@ typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG]; /* AArch32 EABI. */ #define EF_ARM_EABI_MASK 0xff000000 -#define compat_elf_check_arch(x) (((x)->e_machine == EM_ARM) && \ +#define compat_elf_check_arch(x) (system_supports_32bit_el0() && \ + ((x)->e_machine == EM_ARM) && \ ((x)->e_flags & EF_ARM_EABI_MASK)) #define compat_start_thread compat_start_thread diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 40a23f24559d..8e62d61f6c42 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -987,7 +987,8 @@ void verify_local_cpu_capabilities(void) verify_local_cpu_features(arm64_features); verify_local_elf_hwcaps(arm64_elf_hwcaps); - verify_local_elf_hwcaps(compat_elf_hwcaps); + if (system_supports_32bit_el0()) + verify_local_elf_hwcaps(compat_elf_hwcaps); } static void __init setup_feature_capabilities(void) @@ -1004,7 +1005,9 @@ void __init setup_cpu_features(void) /* Set the CPU feature capabilies */ setup_feature_capabilities(); setup_elf_hwcaps(arm64_elf_hwcaps); - setup_elf_hwcaps(compat_elf_hwcaps); + + if (system_supports_32bit_el0()) + setup_elf_hwcaps(compat_elf_hwcaps); /* Advertise that we have computed the system capabilities */ set_sys_caps_initialised(); diff --git a/arch/arm64/kernel/sys.c b/arch/arm64/kernel/sys.c index 75151aaf1a52..26fe8ea93ea2 100644 --- a/arch/arm64/kernel/sys.c +++ b/arch/arm64/kernel/sys.c @@ -25,6 +25,7 @@ #include <linux/sched.h> #include <linux/slab.h> #include <linux/syscalls.h> +#include <asm/cpufeature.h> asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, @@ -36,11 +37,20 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len, return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); } +SYSCALL_DEFINE1(arm64_personality, unsigned int, personality) +{ + if (personality(personality) == PER_LINUX32 && + !system_supports_32bit_el0()) + return -EINVAL; + return sys_personality(personality); +} + /* * Wrappers to pass the pt_regs argument. */ asmlinkage long sys_rt_sigreturn_wrapper(void); #define sys_rt_sigreturn sys_rt_sigreturn_wrapper +#define sys_personality sys_arm64_personality #undef __SYSCALL #define __SYSCALL(nr, sym) [nr] = sym, |