diff options
Diffstat (limited to 'arch/arm64/kernel/signal.c')
| -rw-r--r-- | arch/arm64/kernel/signal.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index 660ccf9f7524..a6b6a4079f84 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -26,6 +26,7 @@ #include <linux/tracehook.h> #include <linux/ratelimit.h> +#include <asm/compat.h> #include <asm/debug-monitors.h> #include <asm/elf.h> #include <asm/cacheflush.h> @@ -126,6 +127,12 @@ static int restore_sigframe(struct pt_regs *regs, return err; } +#ifdef CONFIG_ARM64_ILP32 +extern long ilp32_sys_sigaltstack(const stack_t __user *uss_ptr, + stack_t __user *uoss_ptr); +#endif + + asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) { struct rt_sigframe __user *frame; @@ -148,6 +155,19 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) if (restore_sigframe(regs, frame)) goto badframe; +#ifdef CONFIG_ARM64_ILP32 + /* + * ILP32 has to be handled "special" due to maybe not zeroing out + * the upper 32bits of the pointer if the user changed the frame. + */ + if (is_ilp32_compat_task()) { + if (ilp32_sys_sigaltstack(&frame->uc.uc_stack, + NULL) == -EFAULT) + goto badframe; + return regs->regs[0]; + } +#endif + if (restore_altstack(&frame->uc.uc_stack)) goto badframe; @@ -241,6 +261,10 @@ static void setup_return(struct pt_regs *regs, struct k_sigaction *ka, if (ka->sa.sa_flags & SA_RESTORER) sigtramp = ka->sa.sa_restorer; +#ifdef CONFIG_ARM64_ILP32 + else if (is_ilp32_compat_task()) + sigtramp = VDSO_SYMBOL(current->mm->context.vdso, sigtramp_ilp32); +#endif else sigtramp = VDSO_SYMBOL(current->mm->context.vdso, sigtramp); @@ -276,7 +300,7 @@ static int setup_rt_frame(int usig, struct ksignal *ksig, sigset_t *set, static void setup_restart_syscall(struct pt_regs *regs) { - if (is_compat_task()) + if (is_a32_compat_task()) compat_setup_restart_syscall(regs); else regs->regs[8] = __NR_restart_syscall; @@ -302,7 +326,7 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) /* * Set up the stack frame */ - if (is_compat_task()) { + if (is_a32_compat_task()) { if (ksig->ka.sa.sa_flags & SA_SIGINFO) ret = compat_setup_rt_frame(usig, ksig, oldset, regs); else @@ -421,3 +445,18 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, fpsimd_restore_current_state(); } + +/* + * Some functions are needed for compat ptrace but we don't define + * them if we don't have AARCH32 support compiled in + */ +#if defined CONFIG_COMPAT && !defined CONFIG_AARCH32_EL0 +int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) +{ + return -EFAULT; +} +int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) +{ + return -EFAULT; +} +#endif |