diff options
| -rw-r--r-- | arch/powerpc/include/asm/thread_info.h | 8 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/uaccess.h | 8 | ||||
| -rw-r--r-- | arch/powerpc/kernel/signal.c | 4 |
3 files changed, 16 insertions, 4 deletions
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index 5964145db03d..f308dfeb2746 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -79,8 +79,7 @@ extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_SIGPENDING 1 /* signal pending */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ -#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling - TIF_NEED_RESCHED */ +#define TIF_FSCHECK 3 /* Check FS is USER_DS on return */ #define TIF_32BIT 4 /* 32 bit binary */ #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ #define TIF_PATCH_PENDING 6 /* pending live patching update */ @@ -99,6 +98,7 @@ extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src #if defined(CONFIG_PPC64) #define TIF_ELF2ABI 18 /* function descriptors must die! */ #endif +#define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */ /* as above, but as bit values */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) @@ -118,13 +118,15 @@ extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) #define _TIF_NOHZ (1<<TIF_NOHZ) +#define _TIF_FSCHECK (1<<TIF_FSCHECK) #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ _TIF_NOHZ) #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ - _TIF_RESTORE_TM | _TIF_PATCH_PENDING) + _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \ + _TIF_FSCHECK) #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) /* Bits in local_flags */ diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h index a91cea15187b..abba80f8ff04 100644 --- a/arch/powerpc/include/asm/uaccess.h +++ b/arch/powerpc/include/asm/uaccess.h @@ -31,7 +31,13 @@ #define get_ds() (KERNEL_DS) #define get_fs() (current->thread.addr_limit) -#define set_fs(val) (current->thread.addr_limit = (val)) + +static inline void set_fs(mm_segment_t fs) +{ + current->thread.addr_limit = fs; + /* On user-mode return check addr_limit (fs) is correct */ + set_thread_flag(TIF_FSCHECK); +} #define segment_eq(a, b) ((a).seg == (b).seg) diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c index 61db86ecd318..fb932f1202c7 100644 --- a/arch/powerpc/kernel/signal.c +++ b/arch/powerpc/kernel/signal.c @@ -15,6 +15,7 @@ #include <linux/key.h> #include <linux/context_tracking.h> #include <linux/livepatch.h> +#include <linux/syscalls.h> #include <asm/hw_breakpoint.h> #include <linux/uaccess.h> #include <asm/unistd.h> @@ -150,6 +151,9 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) { user_exit(); + /* Check valid addr_limit, TIF check is done there */ + addr_limit_user_check(); + if (thread_info_flags & _TIF_UPROBE) uprobe_notify_resume(regs); |