diff options
| -rw-r--r-- | arch/x86/kernel/ptrace_32.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/ptrace_32.c b/arch/x86/kernel/ptrace_32.c index 5aca84ef26d..26071305de2 100644 --- a/arch/x86/kernel/ptrace_32.c +++ b/arch/x86/kernel/ptrace_32.c @@ -55,6 +55,12 @@ static int putreg(struct task_struct *child, if (value && (value & 3) != 3) return -EIO; child->thread.gs = value; + if (child == current) + /* + * The user-mode %gs is not affected by + * kernel entry, so we must update the CPU. + */ + loadsegment(gs, value); return 0; case DS: case ES: @@ -104,6 +110,8 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno) break; case GS: retval = child->thread.gs; + if (child == current) + savesegment(gs, retval); break; case DS: case ES: |