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authorAl Viro <viro@zeniv.linux.org.uk>2020-02-16 03:36:40 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2020-03-26 21:39:38 +0300
commite2390741053e4931841650b5eadac32697aa88aa (patch)
treed7c1de71bce8054fc02f8ad0900ed46dba393e68 /arch/x86/ia32
parent44a1d996325982025eefcdc50b636ab83e813372 (diff)
downloadlinux-e2390741053e4931841650b5eadac32697aa88aa.tar.xz
x86: ia32_setup_frame(): consolidate uaccess areas
Currently we have user_access block, followed by __put_user(), deciding what the restorer will be and finally a put_user_try block. Moving the calculation of restorer first allows the rest (actual copyout work) to coalesce into a single user_access block. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/x86/ia32')
-rw-r--r--arch/x86/ia32/ia32_signal.c39
1 files changed, 12 insertions, 27 deletions
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 799ca5b31b87..7018c2c325a1 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -236,7 +236,6 @@ int ia32_setup_frame(int sig, struct ksignal *ksig,
{
struct sigframe_ia32 __user *frame;
void __user *restorer;
- int err = 0;
void __user *fp = NULL;
/* copy_to_user optimizes that into a single 8 byte store */
@@ -252,21 +251,6 @@ int ia32_setup_frame(int sig, struct ksignal *ksig,
frame = get_sigframe(ksig, regs, sizeof(*frame), &fp);
- if (!access_ok(frame, sizeof(*frame)))
- return -EFAULT;
-
- if (__put_user(sig, &frame->sig))
- return -EFAULT;
-
- if (!user_access_begin(&frame->sc, sizeof(struct sigcontext_32)))
- return -EFAULT;
-
- unsafe_put_sigcontext32(&frame->sc, fp, regs, set, Efault);
- user_access_end();
-
- if (__put_user(set->sig[1], &frame->extramask[0]))
- return -EFAULT;
-
if (ksig->ka.sa.sa_flags & SA_RESTORER) {
restorer = ksig->ka.sa.sa_restorer;
} else {
@@ -278,19 +262,20 @@ int ia32_setup_frame(int sig, struct ksignal *ksig,
restorer = &frame->retcode;
}
- put_user_try {
- put_user_ex(ptr_to_compat(restorer), &frame->pretcode);
-
- /*
- * These are actually not used anymore, but left because some
- * gdb versions depend on them as a marker.
- */
- put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
- } put_user_catch(err);
-
- if (err)
+ if (!user_access_begin(frame, sizeof(*frame)))
return -EFAULT;
+ unsafe_put_user(sig, &frame->sig, Efault);
+ unsafe_put_sigcontext32(&frame->sc, fp, regs, set, Efault);
+ unsafe_put_user(set->sig[1], &frame->extramask[0], Efault);
+ unsafe_put_user(ptr_to_compat(restorer), &frame->pretcode, Efault);
+ /*
+ * These are actually not used anymore, but left because some
+ * gdb versions depend on them as a marker.
+ */
+ unsafe_put_user(*((u64 *)&code), (u64 __user *)frame->retcode, Efault);
+ user_access_end();
+
/* Set up registers for signal handler */
regs->sp = (unsigned long) frame;
regs->ip = (unsigned long) ksig->ka.sa.sa_handler;