x86: ioperm user_regset

This adds a user_regset type for the x86 io permissions bitmap.
This makes it appear in core dumps (when ioperm has been used).
It will also make it visible to debuggers in the future.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
[conflict resolutions: Signed-off-by: Ingo Molnar <mingo@elte.hu> ]

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index e375b658efc316e4e14785b7f2a3ad61e763cd82..4e1ef66c2ea4163fb312f296b9232d13273a4a15 100644 (file)
--- 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 edc3dac3f02f446802136b6ad65bbc39cbd6996a..0b61ca41a0445009ee757680aa31fa2320e144f2 100644 (file)
--- 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 */