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

and in other strange binfmts. vDSO is not necessarily mapped there.

Signed-off-by: Andi Kleen <ak@suse.de>

diff --git a/arch/i386/kernel/signal.c b/arch/i386/kernel/signal.c
index 8f4afcc..4f99e87 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>
@@ -349,7 +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;
 

diff --git a/arch/x86_64/ia32/ia32_signal.c b/arch/x86_64/ia32/ia32_signal.c
index 490f7c1..359eacc 100644 (file)
--- a/arch/x86_64/ia32/ia32_signal.c
+++ b/arch/x86_64/ia32/ia32_signal.c
@@ -21,6 +21,7 @@
 #include <linux/stddef.h>
 #include <linux/personality.h>
 #include <linux/compat.h>
+#include <linux/binfmts.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
 #include <asm/i387.h>
@@ -449,7 +450,11 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
 
        /* Return stub is in 32bit vsyscall page */
        { 
-               void __user *restorer = VSYSCALL32_SIGRETURN; 
+               void __user *restorer;
+               if (current->binfmt->hasvdso)
+                       restorer = VSYSCALL32_SIGRETURN;
+               else
+                       restorer = (void *)&frame->retcode;
                if (ka->sa.sa_flags & SA_RESTORER)
                        restorer = ka->sa.sa_restorer;       
                err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 669dbe5..51db118 100644 (file)
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -76,7 +76,8 @@ static struct linux_binfmt elf_format = {
                .load_binary    = load_elf_binary,
                .load_shlib     = load_elf_library,
                .core_dump      = elf_core_dump,
-               .min_coredump   = ELF_EXEC_PAGESIZE
+               .min_coredump   = ELF_EXEC_PAGESIZE,
+               .hasvdso        = 1
 };
 
 #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)

diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index c1e82c5..2d956cd 100644 (file)
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -59,6 +59,7 @@ struct linux_binfmt {
        int (*load_shlib)(struct file *);
        int (*core_dump)(long signr, struct pt_regs * regs, struct file * file);
        unsigned long min_coredump;     /* minimal dump size */
+       int hasvdso;
 };
 
 extern int register_binfmt(struct linux_binfmt *);