diff options
| -rw-r--r-- | arch/arm/include/asm/elf.h | 68 | ||||
| -rw-r--r-- | arch/arm/include/asm/page.h | 5 | ||||
| -rw-r--r-- | arch/arm/include/asm/pgtable.h | 47 | ||||
| -rw-r--r-- | arch/arm/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/elf.c | 79 | ||||
| -rw-r--r-- | arch/arm/kernel/module.c | 2 |
6 files changed, 145 insertions, 58 deletions
diff --git a/arch/arm/include/asm/elf.h b/arch/arm/include/asm/elf.h index 7ea302c14a59..5be016980c19 100644 --- a/arch/arm/include/asm/elf.h +++ b/arch/arm/include/asm/elf.h @@ -18,9 +18,32 @@ typedef elf_greg_t elf_gregset_t[ELF_NGREG]; typedef struct user_fp elf_fpregset_t; #define EM_ARM 40 -#define EF_ARM_APCS26 0x08 -#define EF_ARM_SOFT_FLOAT 0x200 -#define EF_ARM_EABI_MASK 0xFF000000 + +#define EF_ARM_EABI_MASK 0xff000000 +#define EF_ARM_EABI_UNKNOWN 0x00000000 +#define EF_ARM_EABI_VER1 0x01000000 +#define EF_ARM_EABI_VER2 0x02000000 +#define EF_ARM_EABI_VER3 0x03000000 +#define EF_ARM_EABI_VER4 0x04000000 +#define EF_ARM_EABI_VER5 0x05000000 + +#define EF_ARM_BE8 0x00800000 /* ABI 4,5 */ +#define EF_ARM_LE8 0x00400000 /* ABI 4,5 */ +#define EF_ARM_MAVERICK_FLOAT 0x00000800 /* ABI 0 */ +#define EF_ARM_VFP_FLOAT 0x00000400 /* ABI 0 */ +#define EF_ARM_SOFT_FLOAT 0x00000200 /* ABI 0 */ +#define EF_ARM_OLD_ABI 0x00000100 /* ABI 0 */ +#define EF_ARM_NEW_ABI 0x00000080 /* ABI 0 */ +#define EF_ARM_ALIGN8 0x00000040 /* ABI 0 */ +#define EF_ARM_PIC 0x00000020 /* ABI 0 */ +#define EF_ARM_MAPSYMSFIRST 0x00000010 /* ABI 2 */ +#define EF_ARM_APCS_FLOAT 0x00000010 /* ABI 0, floats in fp regs */ +#define EF_ARM_DYNSYMSUSESEGIDX 0x00000008 /* ABI 2 */ +#define EF_ARM_APCS_26 0x00000008 /* ABI 0 */ +#define EF_ARM_SYMSARESORTED 0x00000004 /* ABI 1,2 */ +#define EF_ARM_INTERWORK 0x00000004 /* ABI 0 */ +#define EF_ARM_HASENTRY 0x00000002 /* All */ +#define EF_ARM_RELEXEC 0x00000001 /* All */ #define R_ARM_NONE 0 #define R_ARM_PC24 1 @@ -57,23 +80,16 @@ typedef struct user_fp elf_fpregset_t; extern char elf_platform[]; -/* - * This is used to ensure we don't load something for the wrong architecture. - */ -#define elf_check_arch(x) ((x)->e_machine == EM_ARM && ELF_PROC_OK(x)) +struct elf32_hdr; /* - * 32-bit code is always OK. Some cpus can do 26-bit, some can't. + * This is used to ensure we don't load something for the wrong architecture. */ -#define ELF_PROC_OK(x) (ELF_THUMB_OK(x) && ELF_26BIT_OK(x)) - -#define ELF_THUMB_OK(x) \ - ((elf_hwcap & HWCAP_THUMB && ((x)->e_entry & 1) == 1) || \ - ((x)->e_entry & 3) == 0) +extern int elf_check_arch(const struct elf32_hdr *); +#define elf_check_arch elf_check_arch -#define ELF_26BIT_OK(x) \ - ((elf_hwcap & HWCAP_26BIT && (x)->e_flags & EF_ARM_APCS26) || \ - ((x)->e_flags & EF_ARM_APCS26) == 0) +extern int arm_elf_read_implies_exec(const struct elf32_hdr *, int); +#define elf_read_implies_exec(ex,stk) arm_elf_read_implies_exec(&(ex), stk) #define USE_ELF_CORE_DUMP #define ELF_EXEC_PAGESIZE 4096 @@ -90,23 +106,7 @@ extern char elf_platform[]; have no such handler. */ #define ELF_PLAT_INIT(_r, load_addr) (_r)->ARM_r0 = 0 -/* - * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0 - * and CP1, we only enable access to the iWMMXt coprocessor if the - * binary is EABI or softfloat (and thus, guaranteed not to use - * FPA instructions.) - */ -#define SET_PERSONALITY(ex, ibcs2) \ - do { \ - if ((ex).e_flags & EF_ARM_APCS26) { \ - set_personality(PER_LINUX); \ - } else { \ - set_personality(PER_LINUX_32BIT); \ - if (elf_hwcap & HWCAP_IWMMXT && (ex).e_flags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) \ - set_thread_flag(TIF_USING_IWMMXT); \ - else \ - clear_thread_flag(TIF_USING_IWMMXT); \ - } \ - } while (0) +extern void elf_set_personality(const struct elf32_hdr *); +#define SET_PERSONALITY(ex, ibcs2) elf_set_personality(&(ex)) #endif diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h index cf2e2680daaa..bed1c0a00368 100644 --- a/arch/arm/include/asm/page.h +++ b/arch/arm/include/asm/page.h @@ -184,8 +184,9 @@ typedef struct page *pgtable_t; #endif /* !__ASSEMBLY__ */ -#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ - VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) +#define VM_DATA_DEFAULT_FLAGS \ + (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ + VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) /* * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers. diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index e5054b026c24..b02be6c55aef 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -197,22 +197,29 @@ extern void __pgd_error(const char *file, int line, unsigned long val); * shared mapping bits. */ #define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG -#define _L_PTE_READ L_PTE_USER | L_PTE_EXEC extern pgprot_t pgprot_user; extern pgprot_t pgprot_kernel; -#define PAGE_NONE pgprot_user -#define PAGE_COPY __pgprot(pgprot_val(pgprot_user) | _L_PTE_READ) -#define PAGE_SHARED __pgprot(pgprot_val(pgprot_user) | _L_PTE_READ | \ - L_PTE_WRITE) -#define PAGE_READONLY __pgprot(pgprot_val(pgprot_user) | _L_PTE_READ) -#define PAGE_KERNEL pgprot_kernel - -#define __PAGE_NONE __pgprot(_L_PTE_DEFAULT) -#define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | _L_PTE_READ) -#define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | _L_PTE_READ | L_PTE_WRITE) -#define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | _L_PTE_READ) +#define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b)) + +#define PAGE_NONE pgprot_user +#define PAGE_SHARED _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_WRITE) +#define PAGE_SHARED_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_WRITE | L_PTE_EXEC) +#define PAGE_COPY _MOD_PROT(pgprot_user, L_PTE_USER) +#define PAGE_COPY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_EXEC) +#define PAGE_READONLY _MOD_PROT(pgprot_user, L_PTE_USER) +#define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_EXEC) +#define PAGE_KERNEL pgprot_kernel +#define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_kernel, L_PTE_EXEC) + +#define __PAGE_NONE __pgprot(_L_PTE_DEFAULT) +#define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_WRITE) +#define __PAGE_SHARED_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_WRITE | L_PTE_EXEC) +#define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | L_PTE_USER) +#define __PAGE_COPY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_EXEC) +#define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | L_PTE_USER) +#define __PAGE_READONLY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_EXEC) #endif /* __ASSEMBLY__ */ @@ -228,19 +235,19 @@ extern pgprot_t pgprot_kernel; #define __P001 __PAGE_READONLY #define __P010 __PAGE_COPY #define __P011 __PAGE_COPY -#define __P100 __PAGE_READONLY -#define __P101 __PAGE_READONLY -#define __P110 __PAGE_COPY -#define __P111 __PAGE_COPY +#define __P100 __PAGE_READONLY_EXEC +#define __P101 __PAGE_READONLY_EXEC +#define __P110 __PAGE_COPY_EXEC +#define __P111 __PAGE_COPY_EXEC #define __S000 __PAGE_NONE #define __S001 __PAGE_READONLY #define __S010 __PAGE_SHARED #define __S011 __PAGE_SHARED -#define __S100 __PAGE_READONLY -#define __S101 __PAGE_READONLY -#define __S110 __PAGE_SHARED -#define __S111 __PAGE_SHARED +#define __S100 __PAGE_READONLY_EXEC +#define __S101 __PAGE_READONLY_EXEC +#define __S110 __PAGE_SHARED_EXEC +#define __S111 __PAGE_SHARED_EXEC #ifndef __ASSEMBLY__ /* diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 1d296fc8494e..4305345987d3 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -10,7 +10,7 @@ endif # Object file lists. -obj-y := compat.o entry-armv.o entry-common.o irq.o \ +obj-y := compat.o elf.o entry-armv.o entry-common.o irq.o \ process.o ptrace.o setup.o signal.o \ sys_arm.o stacktrace.o time.o traps.o diff --git a/arch/arm/kernel/elf.c b/arch/arm/kernel/elf.c new file mode 100644 index 000000000000..513f332f040d --- /dev/null +++ b/arch/arm/kernel/elf.c @@ -0,0 +1,79 @@ +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/personality.h> +#include <linux/binfmts.h> +#include <linux/elf.h> + +int elf_check_arch(const struct elf32_hdr *x) +{ + unsigned int eflags; + + /* Make sure it's an ARM executable */ + if (x->e_machine != EM_ARM) + return 0; + + /* Make sure the entry address is reasonable */ + if (x->e_entry & 1) { + if (!(elf_hwcap & HWCAP_THUMB)) + return 0; + } else if (x->e_entry & 3) + return 0; + + eflags = x->e_flags; + if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN) { + /* APCS26 is only allowed if the CPU supports it */ + if ((eflags & EF_ARM_APCS_26) && !(elf_hwcap & HWCAP_26BIT)) + return 0; + + /* VFP requires the supporting code */ + if ((eflags & EF_ARM_VFP_FLOAT) && !(elf_hwcap & HWCAP_VFP)) + return 0; + } + return 1; +} +EXPORT_SYMBOL(elf_check_arch); + +void elf_set_personality(const struct elf32_hdr *x) +{ + unsigned int eflags = x->e_flags; + unsigned int personality = PER_LINUX_32BIT; + + /* + * APCS-26 is only valid for OABI executables + */ + if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN) { + if (eflags & EF_ARM_APCS_26) + personality = PER_LINUX; + } + + set_personality(personality); + + /* + * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0 + * and CP1, we only enable access to the iWMMXt coprocessor if the + * binary is EABI or softfloat (and thus, guaranteed not to use + * FPA instructions.) + */ + if (elf_hwcap & HWCAP_IWMMXT && + eflags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) { + set_thread_flag(TIF_USING_IWMMXT); + } else { + clear_thread_flag(TIF_USING_IWMMXT); + } +} +EXPORT_SYMBOL(elf_set_personality); + +/* + * Set READ_IMPLIES_EXEC if: + * - the binary requires an executable stack + * - we're running on a CPU which doesn't support NX. + */ +int arm_elf_read_implies_exec(const struct elf32_hdr *x, int executable_stack) +{ + if (executable_stack != EXSTACK_ENABLE_X) + return 1; + if (cpu_architecture() <= CPU_ARCH_ARMv6) + return 1; + return 0; +} +EXPORT_SYMBOL(arm_elf_read_implies_exec); diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c index a68259a0cccd..9203ba7d58ee 100644 --- a/arch/arm/kernel/module.c +++ b/arch/arm/kernel/module.c @@ -47,7 +47,7 @@ void *module_alloc(unsigned long size) if (!area) return NULL; - return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL); + return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC); } #else /* CONFIG_MMU */ void *module_alloc(unsigned long size) |
