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-rw-r--r--arch/arm/include/asm/elf.h68
-rw-r--r--arch/arm/include/asm/page.h5
-rw-r--r--arch/arm/include/asm/pgtable.h47
-rw-r--r--arch/arm/kernel/Makefile2
-rw-r--r--arch/arm/kernel/elf.c79
-rw-r--r--arch/arm/kernel/module.c2
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];
18typedef struct user_fp elf_fpregset_t; 18typedef struct user_fp elf_fpregset_t;
19 19
20#define EM_ARM 40 20#define EM_ARM 40
21#define EF_ARM_APCS26 0x08 21
22#define EF_ARM_SOFT_FLOAT 0x200 22#define EF_ARM_EABI_MASK 0xff000000
23#define EF_ARM_EABI_MASK 0xFF000000 23#define EF_ARM_EABI_UNKNOWN 0x00000000
24#define EF_ARM_EABI_VER1 0x01000000
25#define EF_ARM_EABI_VER2 0x02000000
26#define EF_ARM_EABI_VER3 0x03000000
27#define EF_ARM_EABI_VER4 0x04000000
28#define EF_ARM_EABI_VER5 0x05000000
29
30#define EF_ARM_BE8 0x00800000 /* ABI 4,5 */
31#define EF_ARM_LE8 0x00400000 /* ABI 4,5 */
32#define EF_ARM_MAVERICK_FLOAT 0x00000800 /* ABI 0 */
33#define EF_ARM_VFP_FLOAT 0x00000400 /* ABI 0 */
34#define EF_ARM_SOFT_FLOAT 0x00000200 /* ABI 0 */
35#define EF_ARM_OLD_ABI 0x00000100 /* ABI 0 */
36#define EF_ARM_NEW_ABI 0x00000080 /* ABI 0 */
37#define EF_ARM_ALIGN8 0x00000040 /* ABI 0 */
38#define EF_ARM_PIC 0x00000020 /* ABI 0 */
39#define EF_ARM_MAPSYMSFIRST 0x00000010 /* ABI 2 */
40#define EF_ARM_APCS_FLOAT 0x00000010 /* ABI 0, floats in fp regs */
41#define EF_ARM_DYNSYMSUSESEGIDX 0x00000008 /* ABI 2 */
42#define EF_ARM_APCS_26 0x00000008 /* ABI 0 */
43#define EF_ARM_SYMSARESORTED 0x00000004 /* ABI 1,2 */
44#define EF_ARM_INTERWORK 0x00000004 /* ABI 0 */
45#define EF_ARM_HASENTRY 0x00000002 /* All */
46#define EF_ARM_RELEXEC 0x00000001 /* All */
24 47
25#define R_ARM_NONE 0 48#define R_ARM_NONE 0
26#define R_ARM_PC24 1 49#define R_ARM_PC24 1
@@ -57,23 +80,16 @@ typedef struct user_fp elf_fpregset_t;
57 80
58extern char elf_platform[]; 81extern char elf_platform[];
59 82
60/* 83struct elf32_hdr;
61 * This is used to ensure we don't load something for the wrong architecture.
62 */
63#define elf_check_arch(x) ((x)->e_machine == EM_ARM && ELF_PROC_OK(x))
64 84
65/* 85/*
66 * 32-bit code is always OK. Some cpus can do 26-bit, some can't. 86 * This is used to ensure we don't load something for the wrong architecture.
67 */ 87 */
68#define ELF_PROC_OK(x) (ELF_THUMB_OK(x) && ELF_26BIT_OK(x)) 88extern int elf_check_arch(const struct elf32_hdr *);
69 89#define elf_check_arch elf_check_arch
70#define ELF_THUMB_OK(x) \
71 ((elf_hwcap & HWCAP_THUMB && ((x)->e_entry & 1) == 1) || \
72 ((x)->e_entry & 3) == 0)
73 90
74#define ELF_26BIT_OK(x) \ 91extern int arm_elf_read_implies_exec(const struct elf32_hdr *, int);
75 ((elf_hwcap & HWCAP_26BIT && (x)->e_flags & EF_ARM_APCS26) || \ 92#define elf_read_implies_exec(ex,stk) arm_elf_read_implies_exec(&(ex), stk)
76 ((x)->e_flags & EF_ARM_APCS26) == 0)
77 93
78#define USE_ELF_CORE_DUMP 94#define USE_ELF_CORE_DUMP
79#define ELF_EXEC_PAGESIZE 4096 95#define ELF_EXEC_PAGESIZE 4096
@@ -90,23 +106,7 @@ extern char elf_platform[];
90 have no such handler. */ 106 have no such handler. */
91#define ELF_PLAT_INIT(_r, load_addr) (_r)->ARM_r0 = 0 107#define ELF_PLAT_INIT(_r, load_addr) (_r)->ARM_r0 = 0
92 108
93/* 109extern void elf_set_personality(const struct elf32_hdr *);
94 * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0 110#define SET_PERSONALITY(ex, ibcs2) elf_set_personality(&(ex))
95 * and CP1, we only enable access to the iWMMXt coprocessor if the
96 * binary is EABI or softfloat (and thus, guaranteed not to use
97 * FPA instructions.)
98 */
99#define SET_PERSONALITY(ex, ibcs2) \
100 do { \
101 if ((ex).e_flags & EF_ARM_APCS26) { \
102 set_personality(PER_LINUX); \
103 } else { \
104 set_personality(PER_LINUX_32BIT); \
105 if (elf_hwcap & HWCAP_IWMMXT && (ex).e_flags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) \
106 set_thread_flag(TIF_USING_IWMMXT); \
107 else \
108 clear_thread_flag(TIF_USING_IWMMXT); \
109 } \
110 } while (0)
111 111
112#endif 112#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;
184 184
185#endif /* !__ASSEMBLY__ */ 185#endif /* !__ASSEMBLY__ */
186 186
187#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 187#define VM_DATA_DEFAULT_FLAGS \
188 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 188 (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
189 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
189 190
190/* 191/*
191 * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers. 192 * 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);
197 * shared mapping bits. 197 * shared mapping bits.
198 */ 198 */
199#define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG 199#define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG
200#define _L_PTE_READ L_PTE_USER | L_PTE_EXEC
201 200
202extern pgprot_t pgprot_user; 201extern pgprot_t pgprot_user;
203extern pgprot_t pgprot_kernel; 202extern pgprot_t pgprot_kernel;
204 203
205#define PAGE_NONE pgprot_user 204#define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b))
206#define PAGE_COPY __pgprot(pgprot_val(pgprot_user) | _L_PTE_READ) 205
207#define PAGE_SHARED __pgprot(pgprot_val(pgprot_user) | _L_PTE_READ | \ 206#define PAGE_NONE pgprot_user
208 L_PTE_WRITE) 207#define PAGE_SHARED _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_WRITE)
209#define PAGE_READONLY __pgprot(pgprot_val(pgprot_user) | _L_PTE_READ) 208#define PAGE_SHARED_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_WRITE | L_PTE_EXEC)
210#define PAGE_KERNEL pgprot_kernel 209#define PAGE_COPY _MOD_PROT(pgprot_user, L_PTE_USER)
211 210#define PAGE_COPY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_EXEC)
212#define __PAGE_NONE __pgprot(_L_PTE_DEFAULT) 211#define PAGE_READONLY _MOD_PROT(pgprot_user, L_PTE_USER)
213#define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | _L_PTE_READ) 212#define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_EXEC)
214#define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | _L_PTE_READ | L_PTE_WRITE) 213#define PAGE_KERNEL pgprot_kernel
215#define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | _L_PTE_READ) 214#define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_kernel, L_PTE_EXEC)
215
216#define __PAGE_NONE __pgprot(_L_PTE_DEFAULT)
217#define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_WRITE)
218#define __PAGE_SHARED_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_WRITE | L_PTE_EXEC)
219#define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | L_PTE_USER)
220#define __PAGE_COPY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_EXEC)
221#define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | L_PTE_USER)
222#define __PAGE_READONLY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_EXEC)
216 223
217#endif /* __ASSEMBLY__ */ 224#endif /* __ASSEMBLY__ */
218 225
@@ -228,19 +235,19 @@ extern pgprot_t pgprot_kernel;
228#define __P001 __PAGE_READONLY 235#define __P001 __PAGE_READONLY
229#define __P010 __PAGE_COPY 236#define __P010 __PAGE_COPY
230#define __P011 __PAGE_COPY 237#define __P011 __PAGE_COPY
231#define __P100 __PAGE_READONLY 238#define __P100 __PAGE_READONLY_EXEC
232#define __P101 __PAGE_READONLY 239#define __P101 __PAGE_READONLY_EXEC
233#define __P110 __PAGE_COPY 240#define __P110 __PAGE_COPY_EXEC
234#define __P111 __PAGE_COPY 241#define __P111 __PAGE_COPY_EXEC
235 242
236#define __S000 __PAGE_NONE 243#define __S000 __PAGE_NONE
237#define __S001 __PAGE_READONLY 244#define __S001 __PAGE_READONLY
238#define __S010 __PAGE_SHARED 245#define __S010 __PAGE_SHARED
239#define __S011 __PAGE_SHARED 246#define __S011 __PAGE_SHARED
240#define __S100 __PAGE_READONLY 247#define __S100 __PAGE_READONLY_EXEC
241#define __S101 __PAGE_READONLY 248#define __S101 __PAGE_READONLY_EXEC
242#define __S110 __PAGE_SHARED 249#define __S110 __PAGE_SHARED_EXEC
243#define __S111 __PAGE_SHARED 250#define __S111 __PAGE_SHARED_EXEC
244 251
245#ifndef __ASSEMBLY__ 252#ifndef __ASSEMBLY__
246/* 253/*
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
10 10
11# Object file lists. 11# Object file lists.
12 12
13obj-y := compat.o entry-armv.o entry-common.o irq.o \ 13obj-y := compat.o elf.o entry-armv.o entry-common.o irq.o \
14 process.o ptrace.o setup.o signal.o \ 14 process.o ptrace.o setup.o signal.o \
15 sys_arm.o stacktrace.o time.o traps.o 15 sys_arm.o stacktrace.o time.o traps.o
16 16
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 @@
1#include <linux/module.h>
2#include <linux/sched.h>
3#include <linux/personality.h>
4#include <linux/binfmts.h>
5#include <linux/elf.h>
6
7int elf_check_arch(const struct elf32_hdr *x)
8{
9 unsigned int eflags;
10
11 /* Make sure it's an ARM executable */
12 if (x->e_machine != EM_ARM)
13 return 0;
14
15 /* Make sure the entry address is reasonable */
16 if (x->e_entry & 1) {
17 if (!(elf_hwcap & HWCAP_THUMB))
18 return 0;
19 } else if (x->e_entry & 3)
20 return 0;
21
22 eflags = x->e_flags;
23 if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN) {
24 /* APCS26 is only allowed if the CPU supports it */
25 if ((eflags & EF_ARM_APCS_26) && !(elf_hwcap & HWCAP_26BIT))
26 return 0;
27
28 /* VFP requires the supporting code */
29 if ((eflags & EF_ARM_VFP_FLOAT) && !(elf_hwcap & HWCAP_VFP))
30 return 0;
31 }
32 return 1;
33}
34EXPORT_SYMBOL(elf_check_arch);
35
36void elf_set_personality(const struct elf32_hdr *x)
37{
38 unsigned int eflags = x->e_flags;
39 unsigned int personality = PER_LINUX_32BIT;
40
41 /*
42 * APCS-26 is only valid for OABI executables
43 */
44 if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN) {
45 if (eflags & EF_ARM_APCS_26)
46 personality = PER_LINUX;
47 }
48
49 set_personality(personality);
50
51 /*
52 * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0
53 * and CP1, we only enable access to the iWMMXt coprocessor if the
54 * binary is EABI or softfloat (and thus, guaranteed not to use
55 * FPA instructions.)
56 */
57 if (elf_hwcap & HWCAP_IWMMXT &&
58 eflags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) {
59 set_thread_flag(TIF_USING_IWMMXT);
60 } else {
61 clear_thread_flag(TIF_USING_IWMMXT);
62 }
63}
64EXPORT_SYMBOL(elf_set_personality);
65
66/*
67 * Set READ_IMPLIES_EXEC if:
68 * - the binary requires an executable stack
69 * - we're running on a CPU which doesn't support NX.
70 */
71int arm_elf_read_implies_exec(const struct elf32_hdr *x, int executable_stack)
72{
73 if (executable_stack != EXSTACK_ENABLE_X)
74 return 1;
75 if (cpu_architecture() <= CPU_ARCH_ARMv6)
76 return 1;
77 return 0;
78}
79EXPORT_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)
47 if (!area) 47 if (!area)
48 return NULL; 48 return NULL;
49 49
50 return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL); 50 return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
51} 51}
52#else /* CONFIG_MMU */ 52#else /* CONFIG_MMU */
53void *module_alloc(unsigned long size) 53void *module_alloc(unsigned long size)
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-29 23:53:23 -0500