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| author | Al Viro | 2012-11-20 20:24:26 +0100 |
|---|---|---|
| committer | Al Viro | 2012-12-20 00:07:41 +0100 |
| commit | c40702c49faef05ae324f121d8b3e215244ee152 (patch) | |
| tree | b0b2a51b07e944497da5cb48fb461963a3762cad /arch/x86/kernel/signal.c | |
| parent | generic compat_sys_sigaltstack() (diff) | |
| download | kernel-qcow2-linux-c40702c49faef05ae324f121d8b3e215244ee152.tar.gz kernel-qcow2-linux-c40702c49faef05ae324f121d8b3e215244ee152.tar.xz kernel-qcow2-linux-c40702c49faef05ae324f121d8b3e215244ee152.zip | |
new helpers: __save_altstack/__compat_save_altstack, switch x86 and um to those
note that they are relying on access_ok() already checked by caller.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/x86/kernel/signal.c')
| -rw-r--r-- | arch/x86/kernel/signal.c | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c index b17ed37c61a2..a6c8a347b8c6 100644 --- a/arch/x86/kernel/signal.c +++ b/arch/x86/kernel/signal.c @@ -363,10 +363,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, else put_user_ex(0, &frame->uc.uc_flags); put_user_ex(0, &frame->uc.uc_link); - put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); - put_user_ex(sas_ss_flags(regs->sp), - &frame->uc.uc_stack.ss_flags); - put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size); + err |= __save_altstack(&frame->uc.uc_stack, regs->sp); /* Set up to return from userspace. */ restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn); @@ -413,7 +410,6 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, struct rt_sigframe __user *frame; void __user *fp = NULL; int err = 0; - struct task_struct *me = current; frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp); @@ -432,10 +428,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, else put_user_ex(0, &frame->uc.uc_flags); put_user_ex(0, &frame->uc.uc_link); - put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp); - put_user_ex(sas_ss_flags(regs->sp), - &frame->uc.uc_stack.ss_flags); - put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size); + err |= __save_altstack(&frame->uc.uc_stack, regs->sp); /* Set up to return from userspace. If provided, use a stub already in userspace. */ @@ -502,10 +495,7 @@ static int x32_setup_rt_frame(int sig, struct k_sigaction *ka, else put_user_ex(0, &frame->uc.uc_flags); put_user_ex(0, &frame->uc.uc_link); - put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); - put_user_ex(sas_ss_flags(regs->sp), - &frame->uc.uc_stack.ss_flags); - put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size); + err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp); put_user_ex(0, &frame->uc.uc__pad0); if (ka->sa.sa_flags & SA_RESTORER) { @@ -651,7 +641,7 @@ long sys_rt_sigreturn(struct pt_regs *regs) if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) goto badframe; - if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) + if (restore_altstack(&frame->uc.uc_stack)) goto badframe; return ax; |