2 files changed, 38 insertions, 0 deletions

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index e375b658efc3..4e1ef66c2ea4 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -40,7 +40,9 @@ enum x86_regset {
         REGSET_GENERAL,
         REGSET_FP,
         REGSET_XFP,
+        REGSET_IOPERM64 = REGSET_XFP,
         REGSET_TLS,
+        REGSET_IOPERM32,
 };
 
 /*
@@ -555,6 +557,29 @@ static int ptrace_set_debugreg(struct task_struct *child,
         return 0;
 }
 
+/*
+ * These access the current or another (stopped) task's io permission
+ * bitmap for debugging or core dump.
+ */
+static int ioperm_active(struct task_struct *target,
+                         const struct user_regset *regset)
+{
+        return target->thread.io_bitmap_max / regset->size;
+}
+
+static int ioperm_get(struct task_struct *target,
+                      const struct user_regset *regset,
+                      unsigned int pos, unsigned int count,
+                      void *kbuf, void __user *ubuf)
+{
+        if (!target->thread.io_bitmap_ptr)
+                return -ENXIO;
+
+        return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                   target->thread.io_bitmap_ptr,
+                                   0, IO_BITMAP_BYTES);
+}
+
 #ifdef CONFIG_X86_PTRACE_BTS
 /*
  * The configuration for a particular BTS hardware implementation.
@@ -1385,6 +1410,12 @@ static const struct user_regset x86_64_regsets[] = {
                 .size = sizeof(long), .align = sizeof(long),
                 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
         },
+        [REGSET_IOPERM64] = {
+                .core_note_type = NT_386_IOPERM,
+                .n = IO_BITMAP_LONGS,
+                .size = sizeof(long), .align = sizeof(long),
+                .active = ioperm_active, .get = ioperm_get
+        },
 };
 
 static const struct user_regset_view user_x86_64_view = {
@@ -1431,6 +1462,12 @@ static const struct user_regset x86_32_regsets[] = {
                 .active = regset_tls_active,
                 .get = regset_tls_get, .set = regset_tls_set
         },
+        [REGSET_IOPERM32] = {
+                .core_note_type = NT_386_IOPERM,
+                .n = IO_BITMAP_BYTES / sizeof(u32),
+                .size = sizeof(u32), .align = sizeof(u32),
+                .active = ioperm_active, .get = ioperm_get
+        },
 };
 
 static const struct user_regset_view user_x86_32_view = {
diff --git a/include/linux/elf.h b/include/linux/elf.h
index edc3dac3f02f..0b61ca41a044 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -360,6 +360,7 @@ typedef struct elf64_shdr {
 #define NT_PPC_SPE      0x101           /* PowerPC SPE/EVR registers */
 #define NT_PPC_VSX      0x102           /* PowerPC VSX registers */
 #define NT_386_TLS      0x200           /* i386 TLS slots (struct user_desc) */
+#define NT_386_IOPERM   0x201           /* x86 io permission bitmap (1=deny) */
 
 
 /* Note header in a PT_NOTE section */