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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-10-19 22:06:36 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-10-19 22:06:36 +0100
commit809b4e00baf006a990a73329ba381d536c6fa277 (patch)
treee949e0efd019d6f932537aba762792b07a84351c /arch/arm/kernel
parenta0a55682b83fd5f012afadcf415b030d7424ae68 (diff)
parent79a94c3538bda6869d7bb150b5e02dd3a72314dd (diff)
Merge branch 'devel-stable' into devel
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/entry-common.S15
-rw-r--r--arch/arm/kernel/kprobes-decode.c7
-rw-r--r--arch/arm/kernel/process.c21
3 files changed, 38 insertions, 5 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 2d23ad98518..8bfa98757cd 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -334,7 +334,6 @@ ENTRY(vector_swi)
get_thread_info tsk
adr tbl, sys_call_table @ load syscall table pointer
- ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing
#if defined(CONFIG_OABI_COMPAT)
/*
@@ -351,8 +350,20 @@ ENTRY(vector_swi)
eor scno, scno, #__NR_SYSCALL_BASE @ check OS number
#endif
+ ldr r10, [tsk, #TI_FLAGS] @ check for syscall tracing
stmdb sp!, {r4, r5} @ push fifth and sixth args
- tst ip, #_TIF_SYSCALL_TRACE @ are we tracing syscalls?
+
+#ifdef CONFIG_SECCOMP
+ tst r10, #_TIF_SECCOMP
+ beq 1f
+ mov r0, scno
+ bl __secure_computing
+ add r0, sp, #S_R0 + S_OFF @ pointer to regs
+ ldmia r0, {r0 - r3} @ have to reload r0 - r3
+1:
+#endif
+
+ tst r10, #_TIF_SYSCALL_TRACE @ are we tracing syscalls?
bne __sys_trace
cmp scno, #NR_syscalls @ check upper syscall limit
diff --git a/arch/arm/kernel/kprobes-decode.c b/arch/arm/kernel/kprobes-decode.c
index 8bccbfa693f..2c1f0050c9c 100644
--- a/arch/arm/kernel/kprobes-decode.c
+++ b/arch/arm/kernel/kprobes-decode.c
@@ -1162,11 +1162,12 @@ space_cccc_001x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
{
/*
* MSR : cccc 0011 0x10 xxxx xxxx xxxx xxxx xxxx
- * Undef : cccc 0011 0x00 xxxx xxxx xxxx xxxx xxxx
+ * Undef : cccc 0011 0100 xxxx xxxx xxxx xxxx xxxx
* ALU op with S bit and Rd == 15 :
* cccc 001x xxx1 xxxx 1111 xxxx xxxx xxxx
*/
- if ((insn & 0x0f900000) == 0x03200000 || /* MSR & Undef */
+ if ((insn & 0x0fb00000) == 0x03200000 || /* MSR */
+ (insn & 0x0ff00000) == 0x03400000 || /* Undef */
(insn & 0x0e10f000) == 0x0210f000) /* ALU s-bit, R15 */
return INSN_REJECTED;
@@ -1177,7 +1178,7 @@ space_cccc_001x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
* *S (bit 20) updates condition codes
* ADC/SBC/RSC reads the C flag
*/
- insn &= 0xfff00fff; /* Rn = r0, Rd = r0 */
+ insn &= 0xffff0fff; /* Rd = r0 */
asi->insn[0] = insn;
asi->insn_handler = (insn & (1 << 20)) ? /* S-bit */
emulate_alu_imm_rwflags : emulate_alu_imm_rflags;
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 3af34bf4f4d..e76fcaadce0 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -482,3 +482,24 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
unsigned long range_end = mm->brk + 0x02000000;
return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
}
+
+/*
+ * The vectors page is always readable from user space for the
+ * atomic helpers and the signal restart code. Let's declare a mapping
+ * for it so it is visible through ptrace and /proc/<pid>/mem.
+ */
+
+int vectors_user_mapping(void)
+{
+ struct mm_struct *mm = current->mm;
+ return install_special_mapping(mm, 0xffff0000, PAGE_SIZE,
+ VM_READ | VM_EXEC |
+ VM_MAYREAD | VM_MAYEXEC |
+ VM_ALWAYSDUMP | VM_RESERVED,
+ NULL);
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+ return (vma->vm_start == 0xffff0000) ? "[vectors]" : NULL;
+}