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arc: don't leak bits of kernel stack into coredump
On faulting sigreturn we do get SIGSEGV, all right, but anything we'd put into pt_regs could end up in the coredump. And since __copy_from_user() never zeroed on arc, we'd better bugger off on its failure without copying random uninitialized bits of kernel stack into pt_regs... Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -107,13 +107,13 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf)
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struct user_regs_struct uregs;
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err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
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if (!err)
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set_current_blocked(&set);
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err |= __copy_from_user(&uregs.scratch,
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&(sf->uc.uc_mcontext.regs.scratch),
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sizeof(sf->uc.uc_mcontext.regs.scratch));
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if (err)
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return err;
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set_current_blocked(&set);
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regs->bta = uregs.scratch.bta;
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regs->lp_start = uregs.scratch.lp_start;
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regs->lp_end = uregs.scratch.lp_end;
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@ -138,7 +138,7 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf)
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regs->r0 = uregs.scratch.r0;
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regs->sp = uregs.scratch.sp;
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return err;
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return 0;
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}
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static inline int is_do_ss_needed(unsigned int magic)
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