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| author | Al Viro <viro@ftp.linux.org.uk> | 2011-08-18 23:00:29 +0400 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2011-11-02 17:14:41 +0400 |
| commit | 3c916fec12ab614aca5cf6ec09ae3adc6b911193 (patch) | |
| tree | 60d3d645482cfc080563a102fb7fbb84fd7ac4b8 | |
| parent | 78722a445bb253fa6bcbe9d6589f27db78056af6 (diff) | |
| download | linux-3c916fec12ab614aca5cf6ec09ae3adc6b911193.tar.xz | |
um: don't rely on sc.fpstate not having been reassigned prior to rt_sigreturn()
native rt_sigreturn() doesn't...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
| -rw-r--r-- | arch/um/sys-x86_64/signal.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c index 581b64d86a6c..ccfa5544e92c 100644 --- a/arch/um/sys-x86_64/signal.c +++ b/arch/um/sys-x86_64/signal.c @@ -44,10 +44,10 @@ void copy_sc(struct uml_pt_regs *regs, void *from) } static int copy_sc_from_user(struct pt_regs *regs, - struct sigcontext __user *from, - struct _fpstate __user *fpp) + struct sigcontext __user *from) { struct user_i387_struct fp; + void __user *buf; int err = 0; #define GETREG(regs, regno, sc, regname) \ @@ -78,7 +78,11 @@ static int copy_sc_from_user(struct pt_regs *regs, #undef GETREG - err = copy_from_user(&fp, fpp, sizeof(struct user_i387_struct)); + err = __get_user(buf, &from->fpstate); + if (err) + return 1; + + err = copy_from_user(&fp, buf, sizeof(struct user_i387_struct)); if (err) return 1; @@ -272,8 +276,7 @@ long sys_rt_sigreturn(struct pt_regs *regs) sigdelsetmask(&set, ~_BLOCKABLE); set_current_blocked(&set); - if (copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext, - &frame->fpstate)) + if (copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext)) goto segfault; /* Avoid ERESTART handling */ |