594 lines
16 KiB
Diff
594 lines
16 KiB
Diff
--- a/arch/x86/include/asm/desc.h
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+++ b/arch/x86/include/asm/desc.h
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@@ -5,6 +5,7 @@
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#include <asm/ldt.h>
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#include <asm/mmu.h>
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#include <linux/smp.h>
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+#include <linux/mm_types.h>
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static inline void fill_ldt(struct desc_struct *desc,
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const struct user_desc *info)
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@@ -93,6 +94,9 @@ static inline int desc_empty(const void *ptr)
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#define load_TLS(t, cpu) native_load_tls(t, cpu)
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#define set_ldt native_set_ldt
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+#ifdef CONFIG_X86_32
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+#define load_user_cs_desc native_load_user_cs_desc
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+#endif /*CONFIG_X86_32*/
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#define write_ldt_entry(dt, entry, desc) \
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native_write_ldt_entry(dt, entry, desc)
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@@ -392,4 +396,25 @@ static inline void set_system_intr_gate_ist(int n, void *addr, unsigned ist)
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_set_gate(n, GATE_INTERRUPT, addr, 0x3, ist, __KERNEL_CS);
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}
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+#ifdef CONFIG_X86_32
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+static inline void set_user_cs(struct desc_struct *desc, unsigned long limit)
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+{
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+ limit = (limit - 1) / PAGE_SIZE;
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+ desc->a = limit & 0xffff;
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+ desc->b = (limit & 0xf0000) | 0x00c0fb00;
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+}
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+
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+static inline void native_load_user_cs_desc(int cpu, struct mm_struct *mm)
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+{
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+ get_cpu_gdt_table(cpu)[GDT_ENTRY_DEFAULT_USER_CS] = (mm)->context.user_cs;
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+}
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+
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+#define arch_add_exec_range arch_add_exec_range
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+#define arch_remove_exec_range arch_remove_exec_range
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+#define arch_flush_exec_range arch_flush_exec_range
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+extern void arch_add_exec_range(struct mm_struct *mm, unsigned long limit);
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+extern void arch_remove_exec_range(struct mm_struct *mm, unsigned long limit);
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+extern void arch_flush_exec_range(struct mm_struct *mm);
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+#endif /* CONFIG_X86_32 */
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+
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#endif /* _ASM_X86_DESC_H */
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--- a/arch/x86/include/asm/mmu.h
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+++ b/arch/x86/include/asm/mmu.h
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@@ -7,12 +7,19 @@
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/*
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* The x86 doesn't have a mmu context, but
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* we put the segment information here.
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+ *
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+ * exec_limit is used to track the range PROT_EXEC
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+ * mappings span.
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*/
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typedef struct {
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void *ldt;
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int size;
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struct mutex lock;
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void *vdso;
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+#ifdef CONFIG_X86_32
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+ struct desc_struct user_cs;
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+ unsigned long exec_limit;
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+#endif
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} mm_context_t;
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#ifdef CONFIG_SMP
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--- a/arch/x86/include/asm/paravirt.h
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+++ b/arch/x86/include/asm/paravirt.h
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@@ -289,6 +289,12 @@ static inline void set_ldt(const void *addr, unsigned entries)
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{
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PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
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}
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+#ifdef CONFIG_X86_32
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+static inline void load_user_cs_desc(unsigned int cpu, struct mm_struct *mm)
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+{
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+ PVOP_VCALL2(pv_cpu_ops.load_user_cs_desc, cpu, mm);
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+}
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+#endif /*CONFIG_X86_32*/
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static inline void store_gdt(struct desc_ptr *dtr)
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{
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PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
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--- a/arch/x86/include/asm/paravirt_types.h
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+++ b/arch/x86/include/asm/paravirt_types.h
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@@ -118,6 +118,9 @@ struct pv_cpu_ops {
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void (*store_gdt)(struct desc_ptr *);
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void (*store_idt)(struct desc_ptr *);
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void (*set_ldt)(const void *desc, unsigned entries);
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+#ifdef CONFIG_X86_32
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+ void (*load_user_cs_desc)(int cpu, struct mm_struct *mm);
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+#endif
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unsigned long (*store_tr)(void);
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void (*load_tls)(struct thread_struct *t, unsigned int cpu);
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#ifdef CONFIG_X86_64
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--- a/arch/x86/kernel/cpu/common.c
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+++ b/arch/x86/kernel/cpu/common.c
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@@ -802,6 +802,22 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
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/* Filter out anything that depends on CPUID levels we don't have */
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filter_cpuid_features(c, true);
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+#ifdef CONFIG_X86_32
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+ /*
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+ * emulation of NX with segment limits unfortunately means
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+ * we have to disable the fast system calls, due to the way that
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+ * sysexit clears the segment limits on return.
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+ * If we have either disabled exec-shield on the boot command line,
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+ * or we have NX, then we don't need to do this.
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+ */
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+ if (!disable_nx) {
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+#ifdef CONFIG_X86_PAE
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+ if (!test_cpu_cap(c, X86_FEATURE_NX))
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+#endif
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+ clear_cpu_cap(c, X86_FEATURE_SEP);
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+ }
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+#endif
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+
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/* If the model name is still unset, do table lookup. */
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if (!c->x86_model_id[0]) {
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const char *p;
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--- a/arch/x86/kernel/paravirt.c
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+++ b/arch/x86/kernel/paravirt.c
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@@ -345,6 +345,9 @@ struct pv_cpu_ops pv_cpu_ops = {
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.read_tscp = native_read_tscp,
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.load_tr_desc = native_load_tr_desc,
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.set_ldt = native_set_ldt,
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+#ifdef CONFIG_X86_32
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+ .load_user_cs_desc = native_load_user_cs_desc,
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+#endif /*CONFIG_X86_32*/
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.load_gdt = native_load_gdt,
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.load_idt = native_load_idt,
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.store_gdt = native_store_gdt,
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--- a/arch/x86/kernel/process_32.c
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+++ b/arch/x86/kernel/process_32.c
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@@ -243,7 +243,10 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
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void
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start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
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{
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+ int cpu;
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+
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set_user_gs(regs, 0);
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+
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regs->fs = 0;
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set_fs(USER_DS);
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regs->ds = __USER_DS;
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@@ -252,6 +255,11 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
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regs->cs = __USER_CS;
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regs->ip = new_ip;
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regs->sp = new_sp;
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+
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+ cpu = get_cpu();
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+ load_user_cs_desc(cpu, current->mm);
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+ put_cpu();
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+
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/*
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* Free the old FP and other extended state
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*/
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@@ -311,6 +319,9 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
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if (preload_fpu)
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prefetch(next->fpu.state);
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+ if (next_p->mm)
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+ load_user_cs_desc(cpu, next_p->mm);
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+
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/*
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* Reload esp0.
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*/
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@@ -404,3 +415,40 @@ unsigned long get_wchan(struct task_struct *p)
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return 0;
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}
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+static void modify_cs(struct mm_struct *mm, unsigned long limit)
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+{
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+ mm->context.exec_limit = limit;
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+ set_user_cs(&mm->context.user_cs, limit);
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+ if (mm == current->mm) {
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+ int cpu;
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+
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+ cpu = get_cpu();
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+ load_user_cs_desc(cpu, mm);
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+ put_cpu();
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+ }
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+}
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+
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+void arch_add_exec_range(struct mm_struct *mm, unsigned long limit)
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+{
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+ if (limit > mm->context.exec_limit)
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+ modify_cs(mm, limit);
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+}
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+
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+void arch_remove_exec_range(struct mm_struct *mm, unsigned long old_end)
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+{
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+ struct vm_area_struct *vma;
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+ unsigned long limit = PAGE_SIZE;
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+
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+ if (old_end == mm->context.exec_limit) {
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+ for (vma = mm->mmap; vma; vma = vma->vm_next)
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+ if ((vma->vm_flags & VM_EXEC) && (vma->vm_end > limit))
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+ limit = vma->vm_end;
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+ modify_cs(mm, limit);
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+ }
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+}
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+
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+void arch_flush_exec_range(struct mm_struct *mm)
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+{
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+ mm->context.exec_limit = 0;
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+ set_user_cs(&mm->context.user_cs, 0);
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+}
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--- a/arch/x86/kernel/traps.c
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+++ b/arch/x86/kernel/traps.c
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@@ -109,6 +109,78 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
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dec_preempt_count();
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}
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+#ifdef CONFIG_X86_32
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+static inline int
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+__compare_user_cs_desc(const struct desc_struct *desc1,
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+ const struct desc_struct *desc2)
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+{
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+ return ((desc1->limit0 != desc2->limit0) ||
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+ (desc1->limit != desc2->limit) ||
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+ (desc1->base0 != desc2->base0) ||
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+ (desc1->base1 != desc2->base1) ||
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+ (desc1->base2 != desc2->base2));
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+}
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+
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+/*
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+ * lazy-check for CS validity on exec-shield binaries:
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+ *
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+ * the original non-exec stack patch was written by
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+ * Solar Designer <solar at openwall.com>. Thanks!
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+ */
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+static int
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+check_lazy_exec_limit(int cpu, struct pt_regs *regs, long error_code)
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+{
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+ struct desc_struct *desc1, *desc2;
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+ struct vm_area_struct *vma;
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+ unsigned long limit;
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+
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+ if (current->mm == NULL)
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+ return 0;
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+
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+ limit = -1UL;
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+ if (current->mm->context.exec_limit != -1UL) {
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+ limit = PAGE_SIZE;
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+ spin_lock(¤t->mm->page_table_lock);
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+ for (vma = current->mm->mmap; vma; vma = vma->vm_next)
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+ if ((vma->vm_flags & VM_EXEC) && (vma->vm_end > limit))
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+ limit = vma->vm_end;
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+ vma = get_gate_vma(current);
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+ if (vma && (vma->vm_flags & VM_EXEC) && (vma->vm_end > limit))
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+ limit = vma->vm_end;
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+ spin_unlock(¤t->mm->page_table_lock);
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+ if (limit >= TASK_SIZE)
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+ limit = -1UL;
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+ current->mm->context.exec_limit = limit;
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+ }
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+ set_user_cs(¤t->mm->context.user_cs, limit);
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+
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+ desc1 = ¤t->mm->context.user_cs;
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+ desc2 = get_cpu_gdt_table(cpu) + GDT_ENTRY_DEFAULT_USER_CS;
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+
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+ if (__compare_user_cs_desc(desc1, desc2)) {
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+ /*
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+ * The CS was not in sync - reload it and retry the
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+ * instruction. If the instruction still faults then
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+ * we won't hit this branch next time around.
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+ */
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+ if (print_fatal_signals >= 2) {
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+ printk(KERN_ERR "#GPF fixup (%ld[seg:%lx]) at %08lx, CPU#%d.\n",
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+ error_code, error_code/8, regs->ip,
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+ smp_processor_id());
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+ printk(KERN_ERR "exec_limit: %08lx, user_cs: %08x/%08x, CPU_cs: %08x/%08x.\n",
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+ current->mm->context.exec_limit,
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+ desc1->a, desc1->b, desc2->a, desc2->b);
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+ }
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+
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+ load_user_cs_desc(cpu, current->mm);
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+
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+ return 1;
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+ }
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+
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+ return 0;
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+}
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+#endif
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+
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static void __kprobes
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do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
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long error_code, siginfo_t *info)
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@@ -265,6 +337,29 @@ do_general_protection(struct pt_regs *regs, long error_code)
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if (!user_mode(regs))
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goto gp_in_kernel;
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+#ifdef CONFIG_X86_32
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+{
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+ int cpu;
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+ int ok;
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+
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+ cpu = get_cpu();
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+ ok = check_lazy_exec_limit(cpu, regs, error_code);
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+ put_cpu();
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+
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+ if (ok)
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+ return;
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+
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+ if (print_fatal_signals) {
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+ printk(KERN_ERR "#GPF(%ld[seg:%lx]) at %08lx, CPU#%d.\n",
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+ error_code, error_code/8, regs->ip, smp_processor_id());
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+ printk(KERN_ERR "exec_limit: %08lx, user_cs: %08x/%08x.\n",
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+ current->mm->context.exec_limit,
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+ current->mm->context.user_cs.a,
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+ current->mm->context.user_cs.b);
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+ }
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+}
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+#endif /*CONFIG_X86_32*/
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+
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tsk->thread.error_code = error_code;
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tsk->thread.trap_no = 13;
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@@ -792,19 +887,37 @@ do_device_not_available(struct pt_regs *regs, long error_code)
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}
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#ifdef CONFIG_X86_32
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+/*
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+ * The fixup code for errors in iret jumps to here (iret_exc). It loses
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+ * the original trap number and erorr code. The bogus trap 32 and error
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+ * code 0 are what the vanilla kernel delivers via:
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+ * DO_ERROR_INFO(32, SIGSEGV, "iret exception", iret_error, ILL_BADSTK, 0, 1)
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+ *
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+ * NOTE: Because of the final "1" in the macro we need to enable interrupts.
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+ *
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+ * In case of a general protection fault in the iret instruction, we
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+ * need to check for a lazy CS update for exec-shield.
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+ */
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dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
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{
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- siginfo_t info;
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+ int ok;
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+ int cpu;
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+
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local_irq_enable();
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- info.si_signo = SIGILL;
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- info.si_errno = 0;
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- info.si_code = ILL_BADSTK;
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- info.si_addr = NULL;
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- if (notify_die(DIE_TRAP, "iret exception",
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- regs, error_code, 32, SIGILL) == NOTIFY_STOP)
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- return;
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- do_trap(32, SIGILL, "iret exception", regs, error_code, &info);
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+ cpu = get_cpu();
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+ ok = check_lazy_exec_limit(cpu, regs, error_code);
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+ put_cpu();
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+
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+ if (!ok && notify_die(DIE_TRAP, "iret exception", regs,
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+ error_code, 32, SIGSEGV) != NOTIFY_STOP) {
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+ siginfo_t info;
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+ info.si_signo = SIGSEGV;
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+ info.si_errno = 0;
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+ info.si_code = ILL_BADSTK;
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+ info.si_addr = 0;
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+ do_trap(32, SIGSEGV, "iret exception", regs, error_code, &info);
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+ }
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}
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#endif
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--- a/arch/x86/mm/setup_nx.c
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+++ b/arch/x86/mm/setup_nx.c
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@@ -1,3 +1,4 @@
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+#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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@@ -6,7 +6,7 @@
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#include <asm/pgtable.h>
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#include <asm/proto.h>
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-static int disable_nx __cpuinitdata;
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+int disable_nx __cpuinitdata;
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/*
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* noexec = on|off
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@@ -40,6 +42,10 @@ void __cpuinit x86_configure_nx(void)
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void __init x86_report_nx(void)
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{
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if (!cpu_has_nx) {
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+ if (disable_nx)
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+ printk(KERN_INFO "Using x86 segment limits to approximate NX protection\n");
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+ else
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+
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printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
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"missing in CPU or disabled in BIOS!\n");
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} else {
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--- a/arch/x86/mm/tlb.c
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+++ b/arch/x86/mm/tlb.c
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@@ -6,6 +6,7 @@
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#include <linux/interrupt.h>
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#include <linux/module.h>
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+#include <asm/desc.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu_context.h>
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#include <asm/cache.h>
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@@ -131,6 +132,12 @@ void smp_invalidate_interrupt(struct pt_regs *regs)
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union smp_flush_state *f;
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cpu = smp_processor_id();
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+
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+#ifdef CONFIG_X86_32
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+ if (current->active_mm)
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+ load_user_cs_desc(cpu, current->active_mm);
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+#endif
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+
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/*
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* orig_rax contains the negated interrupt vector.
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* Use that to determine where the sender put the data.
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--- a/arch/x86/xen/enlighten.c
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+++ b/arch/x86/xen/enlighten.c
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@@ -335,6 +335,24 @@ static void xen_set_ldt(const void *addr, unsigned entries)
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xen_mc_issue(PARAVIRT_LAZY_CPU);
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}
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+#ifdef CONFIG_X86_32
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+static void xen_load_user_cs_desc(int cpu, struct mm_struct *mm)
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+{
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+ void *gdt;
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+ xmaddr_t mgdt;
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+ u64 descriptor;
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+ struct desc_struct user_cs;
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+
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+ gdt = &get_cpu_gdt_table(cpu)[GDT_ENTRY_DEFAULT_USER_CS];
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+ mgdt = virt_to_machine(gdt);
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+
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+ user_cs = mm->context.user_cs;
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+ descriptor = (u64) user_cs.a | ((u64) user_cs.b) << 32;
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+
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+ HYPERVISOR_update_descriptor(mgdt.maddr, descriptor);
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+}
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+#endif /*CONFIG_X86_32*/
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+
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static void xen_load_gdt(const struct desc_ptr *dtr)
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{
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unsigned long va = dtr->address;
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@@ -961,6 +979,9 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
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.load_tr_desc = paravirt_nop,
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.set_ldt = xen_set_ldt,
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+#ifdef CONFIG_X86_32
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+ .load_user_cs_desc = xen_load_user_cs_desc,
|
|
+#endif /*CONFIG_X86_32*/
|
|
.load_gdt = xen_load_gdt,
|
|
.load_idt = xen_load_idt,
|
|
.load_tls = xen_load_tls,
|
|
--- a/fs/binfmt_elf.c
|
|
+++ b/fs/binfmt_elf.c
|
|
@@ -717,6 +722,15 @@ static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
|
|
if (retval)
|
|
goto out_free_dentry;
|
|
|
|
+#ifdef CONFIG_X86_32
|
|
+ /*
|
|
+ * Turn off the CS limit completely if exec-shield disabled or
|
|
+ * NX active:
|
|
+ */
|
|
+ if (disable_nx || executable_stack != EXSTACK_DISABLE_X || (__supported_pte_mask & _PAGE_NX))
|
|
+ arch_add_exec_range(current->mm, -1);
|
|
+#endif
|
|
+
|
|
/* OK, This is the point of no return */
|
|
current->flags &= ~PF_FORKNOEXEC;
|
|
current->mm->def_flags = def_flags;
|
|
--- a/include/linux/sched.h
|
|
+++ b/include/linux/sched.h
|
|
@@ -101,6 +101,9 @@ struct bio_list;
|
|
struct fs_struct;
|
|
struct perf_event_context;
|
|
|
|
+extern int disable_nx;
|
|
+extern int print_fatal_signals;
|
|
+
|
|
/*
|
|
* List of flags we want to share for kernel threads,
|
|
* if only because they are not used by them anyway.
|
|
--- b/mm/mmap.c
|
|
+++ b/mm/mmap.c
|
|
@@ -44,6 +45,18 @@
|
|
#define arch_rebalance_pgtables(addr, len) (addr)
|
|
#endif
|
|
|
|
+/* No sane architecture will #define these to anything else */
|
|
+#ifndef arch_add_exec_range
|
|
+#define arch_add_exec_range(mm, limit) do { ; } while (0)
|
|
+#endif
|
|
+#ifndef arch_flush_exec_range
|
|
+#define arch_flush_exec_range(mm) do { ; } while (0)
|
|
+#endif
|
|
+#ifndef arch_remove_exec_range
|
|
+#define arch_remove_exec_range(mm, limit) do { ; } while (0)
|
|
+#endif
|
|
+
|
|
+
|
|
static void unmap_region(struct mm_struct *mm,
|
|
struct vm_area_struct *vma, struct vm_area_struct *prev,
|
|
unsigned long start, unsigned long end);
|
|
@@ -388,6 +401,9 @@
|
|
{
|
|
struct vm_area_struct *next;
|
|
|
|
+ if (vma->vm_flags & VM_EXEC)
|
|
+ arch_add_exec_range(mm, vma->vm_end);
|
|
+
|
|
vma->vm_prev = prev;
|
|
if (prev) {
|
|
next = prev->vm_next;
|
|
@@ -489,6 +504,8 @@
|
|
rb_erase(&vma->vm_rb, &mm->mm_rb);
|
|
if (mm->mmap_cache == vma)
|
|
mm->mmap_cache = prev;
|
|
+ if (vma->vm_flags & VM_EXEC)
|
|
+ arch_remove_exec_range(mm, vma->vm_end);
|
|
}
|
|
|
|
/*
|
|
@@ -790,6 +807,8 @@
|
|
} else /* cases 2, 5, 7 */
|
|
err = vma_adjust(prev, prev->vm_start,
|
|
end, prev->vm_pgoff, NULL);
|
|
+ if (prev->vm_flags & VM_EXEC)
|
|
+ arch_add_exec_range(mm, prev->vm_end);
|
|
if (err)
|
|
return NULL;
|
|
return prev;
|
|
@@ -1966,10 +2075,14 @@
|
|
if (new->vm_ops && new->vm_ops->open)
|
|
new->vm_ops->open(new);
|
|
|
|
- if (new_below)
|
|
+ if (new_below) {
|
|
+ unsigned long old_end = vma->vm_end;
|
|
+
|
|
err = vma_adjust(vma, addr, vma->vm_end, vma->vm_pgoff +
|
|
((addr - new->vm_start) >> PAGE_SHIFT), new);
|
|
- else
|
|
+ if (vma->vm_flags & VM_EXEC)
|
|
+ arch_remove_exec_range(mm, old_end);
|
|
+ } else
|
|
err = vma_adjust(vma, vma->vm_start, addr, vma->vm_pgoff, new);
|
|
|
|
/* Success. */
|
|
@@ -2254,6 +2367,7 @@
|
|
|
|
free_pgtables(tlb, vma, FIRST_USER_ADDRESS, 0);
|
|
tlb_finish_mmu(tlb, 0, end);
|
|
+ arch_flush_exec_range(mm);
|
|
|
|
/*
|
|
* Walk the list again, actually closing and freeing it,
|
|
--- a/mm/mprotect.c
|
|
+++ b/mm/mprotect.c
|
|
@@ -25,9 +25,14 @@
|
|
#include <linux/perf_event.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/pgtable.h>
|
|
+#include <asm/pgalloc.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
+#ifndef arch_remove_exec_range
|
|
+#define arch_remove_exec_range(mm, limit) do { ; } while (0)
|
|
+#endif
|
|
+
|
|
#ifndef pgprot_modify
|
|
static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
|
|
{
|
|
@@ -138,7 +143,7 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
|
|
struct mm_struct *mm = vma->vm_mm;
|
|
unsigned long oldflags = vma->vm_flags;
|
|
long nrpages = (end - start) >> PAGE_SHIFT;
|
|
- unsigned long charged = 0;
|
|
+ unsigned long charged = 0, old_end = vma->vm_end;
|
|
pgoff_t pgoff;
|
|
int error;
|
|
int dirty_accountable = 0;
|
|
@@ -203,6 +208,9 @@ success:
|
|
dirty_accountable = 1;
|
|
}
|
|
|
|
+ if (oldflags & VM_EXEC)
|
|
+ arch_remove_exec_range(current->mm, old_end);
|
|
+
|
|
mmu_notifier_invalidate_range_start(mm, start, end);
|
|
if (is_vm_hugetlb_page(vma))
|
|
hugetlb_change_protection(vma, start, end, vma->vm_page_prot);
|