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-rw-r--r--arch/x86/kernel/ptrace.c37
-rw-r--r--include/linux/elf.h1
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 */