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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-09-10 16:31:04 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-09-15 19:51:55 -0400 |
| commit | 7798bf2140ebcc36eafec6a4194fffd8d585d471 (patch) | |
| tree | f3babde13b19f0f95ba1f27d5af1569404722444 | |
| parent | 085354f907969fb3ee33f236368f6e1dd4c74d62 (diff) | |
| download | blackbird-op-linux-7798bf2140ebcc36eafec6a4194fffd8d585d471.tar.gz blackbird-op-linux-7798bf2140ebcc36eafec6a4194fffd8d585d471.zip | |
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>
| -rw-r--r-- | arch/arc/kernel/signal.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c index 6cb3736b6b83..d347bbc086fe 100644 --- a/arch/arc/kernel/signal.c +++ b/arch/arc/kernel/signal.c @@ -107,13 +107,13 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf) struct user_regs_struct uregs; err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set)); - if (!err) - set_current_blocked(&set); - err |= __copy_from_user(&uregs.scratch, &(sf->uc.uc_mcontext.regs.scratch), sizeof(sf->uc.uc_mcontext.regs.scratch)); + if (err) + return err; + set_current_blocked(&set); regs->bta = uregs.scratch.bta; regs->lp_start = uregs.scratch.lp_start; regs->lp_end = uregs.scratch.lp_end; @@ -138,7 +138,7 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf) regs->r0 = uregs.scratch.r0; regs->sp = uregs.scratch.sp; - return err; + return 0; } static inline int is_do_ss_needed(unsigned int magic) |
