From 5050e91fa650ecd6260ef62bbed9dfc5b4d05dfa Mon Sep 17 00:00:00 2001 From: Matt Redfearn Date: Tue, 29 Mar 2016 09:35:30 +0100 Subject: [PATCH] MIPS: Support sending SIG_SYS to 32bit userspace from 64bit kernel The seccomp_bpf self test revealed that a 64bit kernel delivered an invalid SIG_SYS to a 32bit userspace, because it was falling into the default of the switch statement. Add a case to handle delivering the signal. With this patch, the seccomp_bpf self test now passes the TRAP.handler case with O32 and N32 userlands. Signed-off-by: Matt Redfearn Acked-by: Kees Cook Cc: Paul Burton Cc: Amanieu d'Antras Cc: Alex Smith Cc: Andrew Morton Cc: linux-mips@linux-mips.org Cc: IMG-MIPSLinuxKerneldevelopers@imgtec.com Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/12915/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/signal32.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c index 4909639aa35b..78c8349d151c 100644 --- a/arch/mips/kernel/signal32.c +++ b/arch/mips/kernel/signal32.c @@ -227,6 +227,12 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) err |= __put_user(from->si_uid, &to->si_uid); err |= __put_user(from->si_int, &to->si_int); break; + case __SI_SYS >> 16: + err |= __copy_to_user(&to->si_call_addr, &from->si_call_addr, + sizeof(compat_uptr_t)); + err |= __put_user(from->si_syscall, &to->si_syscall); + err |= __put_user(from->si_arch, &to->si_arch); + break; } } return err; -- 2.20.1