[PATCH] x86: Don't require the vDSO for handling a.out signals

[linux-3.10.git] / arch / i386 / kernel / signal.c

diff --git a/arch/i386/kernel/signal.c b/arch/i386/kernel/signal.c
index 43002cfb40c4e2811bf5006c9126fa2ff1cfdd46..4f99e870c986f41b72168b3dd44fbfc1e075bbe6 100644 (file)
--- a/arch/i386/kernel/signal.c
+++ b/arch/i386/kernel/signal.c
@@ -21,6 +21,7 @@
 #include <linux/suspend.h>
 #include <linux/ptrace.h>
 #include <linux/elf.h>
+#include <linux/binfmts.h>
 #include <asm/processor.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
@@ -129,7 +130,7 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *peax
                         X86_EFLAGS_AF | X86_EFLAGS_PF | X86_EFLAGS_CF)
 
        GET_SEG(gs);
-       GET_SEG(fs);
+       COPY_SEG(fs);
        COPY_SEG(es);
        COPY_SEG(ds);
        COPY(edi);
@@ -244,11 +245,9 @@ setup_sigcontext(struct sigcontext __user *sc, struct _fpstate __user *fpstate,
 {
        int tmp, err = 0;
 
-       tmp = 0;
+       err |= __put_user(regs->xfs, (unsigned int __user *)&sc->fs);
        savesegment(gs, tmp);
        err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
-       savesegment(fs, tmp);
-       err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
 
        err |= __put_user(regs->xes, (unsigned int __user *)&sc->es);
        err |= __put_user(regs->xds, (unsigned int __user *)&sc->ds);
@@ -351,7 +350,10 @@ static int setup_frame(int sig, struct k_sigaction *ka,
                        goto give_sigsegv;
        }
 
-       restorer = (void *)VDSO_SYM(&__kernel_sigreturn);
+       if (current->binfmt->hasvdso)
+               restorer = (void *)VDSO_SYM(&__kernel_sigreturn);
+       else
+               restorer = (void *)&frame->retcode;
        if (ka->sa.sa_flags & SA_RESTORER)
                restorer = ka->sa.sa_restorer;