From: Mark Rutland mark.rutland@arm.com
commit 25dc2c80cfa33153057aa94984855acd57adf92a upstream.
The SPSR_ELx format for exceptions taken from AArch32 differs from the AArch32 PSR format. Thus, we must translate between the two when setting up a compat sigframe, or restoring context from a compat sigframe.
Signed-off-by: Mark Rutland mark.rutland@arm.com Fixes: 7206dc93a58fb764 ("arm64: Expose Arm v8.4 features") Cc: Catalin Marinas catalin.marinas@arm.com Cc: Suzuki Poulose suzuki.poulose@arm.com Cc: Will Deacon will.deacon@arm.com Signed-off-by: Will Deacon will.deacon@arm.com Cc: Guenter Roeck linux@roeck-us.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/arm64/kernel/signal32.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/arch/arm64/kernel/signal32.c +++ b/arch/arm64/kernel/signal32.c @@ -321,6 +321,7 @@ static int compat_restore_sigframe(struc int err; sigset_t set; struct compat_aux_sigframe __user *aux; + unsigned long psr;
err = get_sigset_t(&set, &sf->uc.uc_sigmask); if (err == 0) { @@ -344,7 +345,9 @@ static int compat_restore_sigframe(struc __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); - __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); + __get_user_error(psr, &sf->uc.uc_mcontext.arm_cpsr, err); + + regs->pstate = compat_psr_to_pstate(psr);
/* * Avoid compat_sys_sigreturn() restarting. @@ -500,6 +503,7 @@ static int compat_setup_sigframe(struct struct pt_regs *regs, sigset_t *set) { struct compat_aux_sigframe __user *aux; + unsigned long psr = pstate_to_compat_psr(regs->pstate); int err = 0;
__put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); @@ -518,7 +522,7 @@ static int compat_setup_sigframe(struct __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); - __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); + __put_user_error(psr, &sf->uc.uc_mcontext.arm_cpsr, err);
__put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err); /* set the compat FSR WnR */