From 55928e37b29ba5557a5edc8ab679fe5191bc051d Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 19 Apr 2008 14:27:56 -0700 Subject: [PATCH] x86 signals: lift set_fs This lifts the set_fs(USER_DS) call for signal handler setup out of the three places copying the same code into the one place that calls them all. There is no change in what it does. Signed-off-by: Roland McGrath Signed-off-by: Ingo Molnar --- arch/x86/ia32/ia32_signal.c | 4 ---- arch/x86/kernel/signal_64.c | 11 +++++++---- 2 files changed, 7 insertions(+), 8 deletions(-) diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c index 0866104f68..bbed3a26ce 100644 --- a/arch/x86/ia32/ia32_signal.c +++ b/arch/x86/ia32/ia32_signal.c @@ -499,8 +499,6 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka, regs->cs = __USER32_CS; regs->ss = __USER32_DS; - set_fs(USER_DS); - #if DEBUG_SIG printk(KERN_DEBUG "SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n", current->comm, current->pid, frame, regs->ip, frame->pretcode); @@ -596,8 +594,6 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, regs->cs = __USER32_CS; regs->ss = __USER32_DS; - set_fs(USER_DS); - #if DEBUG_SIG printk(KERN_DEBUG "SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n", current->comm, current->pid, frame, regs->ip, frame->pretcode); diff --git a/arch/x86/kernel/signal_64.c b/arch/x86/kernel/signal_64.c index 3a76702dc3..ccb2a4560c 100644 --- a/arch/x86/kernel/signal_64.c +++ b/arch/x86/kernel/signal_64.c @@ -285,10 +285,6 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, even if the handler happens to be interrupting 32-bit code. */ regs->cs = __USER_CS; - /* This, by contrast, has nothing to do with segment registers - - see include/asm-x86_64/uaccess.h for details. */ - set_fs(USER_DS); - return 0; give_sigsegv: @@ -376,6 +372,13 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, ret = setup_rt_frame(sig, ka, info, oldset, regs); if (ret == 0) { + /* + * This has nothing to do with segment registers, + * despite the name. This magic affects uaccess.h + * macros' behavior. Reset it to the normal setting. + */ + set_fs(USER_DS); + /* * Clear the direction flag as per the ABI for function entry. */ -- 2.39.5