On Thu, 15 Jul 2021 at 20:13, Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote: > While reviewing the signal handlers on alpha it became clear that > si_trapno is only set to a non-zero value when sending SIGFPE and when > sending SITGRAP with si_code TRAP_UNK. > > Add send_sig_fault_trapno and send SIGTRAP TRAP_UNK, and SIGFPE with it. > > Remove the define of __ARCH_SI_TRAPNO and remove the always zero > si_trapno parameter from send_sig_fault and force_sig_fault. > > v1: https://lkml.kernel.org/r/m1eeers7q7.fsf_-_@xxxxxxxxxxxxxxxxx > v2: https://lkml.kernel.org/r/20210505141101.11519-7-ebiederm@xxxxxxxxxxxx > Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> Reviewed-by: Marco Elver <elver@xxxxxxxxxx> > --- > arch/alpha/include/uapi/asm/siginfo.h | 2 -- > arch/alpha/kernel/osf_sys.c | 2 +- > arch/alpha/kernel/signal.c | 4 ++-- > arch/alpha/kernel/traps.c | 26 +++++++++++++------------- > arch/alpha/mm/fault.c | 4 ++-- > include/linux/sched/signal.h | 2 ++ > kernel/signal.c | 21 +++++++++++++++++++++ > 7 files changed, 41 insertions(+), 20 deletions(-) > > diff --git a/arch/alpha/include/uapi/asm/siginfo.h b/arch/alpha/include/uapi/asm/siginfo.h > index 6e1a2af2f962..e08eae88182b 100644 > --- a/arch/alpha/include/uapi/asm/siginfo.h > +++ b/arch/alpha/include/uapi/asm/siginfo.h > @@ -2,8 +2,6 @@ > #ifndef _ALPHA_SIGINFO_H > #define _ALPHA_SIGINFO_H > > -#define __ARCH_SI_TRAPNO > - > #include <asm-generic/siginfo.h> > > #endif > diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c > index d5367a1c6300..bbdb1a9a5fd8 100644 > --- a/arch/alpha/kernel/osf_sys.c > +++ b/arch/alpha/kernel/osf_sys.c > @@ -876,7 +876,7 @@ SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer, > if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV; > if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV; > > - send_sig_fault(SIGFPE, si_code, > + send_sig_fault_trapno(SIGFPE, si_code, > (void __user *)NULL, /* FIXME */ > 0, current); > } > diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c > index 948b89789da8..bc077babafab 100644 > --- a/arch/alpha/kernel/signal.c > +++ b/arch/alpha/kernel/signal.c > @@ -219,7 +219,7 @@ do_sigreturn(struct sigcontext __user *sc) > > /* Send SIGTRAP if we're single-stepping: */ > if (ptrace_cancel_bpt (current)) { > - send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *) regs->pc, 0, > + send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *) regs->pc, > current); > } > return; > @@ -247,7 +247,7 @@ do_rt_sigreturn(struct rt_sigframe __user *frame) > > /* Send SIGTRAP if we're single-stepping: */ > if (ptrace_cancel_bpt (current)) { > - send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *) regs->pc, 0, > + send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *) regs->pc, > current); > } > return; > diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c > index 921d4b6e4d95..e9e3de18793b 100644 > --- a/arch/alpha/kernel/traps.c > +++ b/arch/alpha/kernel/traps.c > @@ -227,7 +227,7 @@ do_entArith(unsigned long summary, unsigned long write_mask, > } > die_if_kernel("Arithmetic fault", regs, 0, NULL); > > - send_sig_fault(SIGFPE, si_code, (void __user *) regs->pc, 0, current); > + send_sig_fault_trapno(SIGFPE, si_code, (void __user *) regs->pc, 0, current); > } > > asmlinkage void > @@ -268,13 +268,13 @@ do_entIF(unsigned long type, struct pt_regs *regs) > regs->pc -= 4; /* make pc point to former bpt */ > } > > - send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc, 0, > + send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc, > current); > return; > > case 1: /* bugcheck */ > - send_sig_fault(SIGTRAP, TRAP_UNK, (void __user *) regs->pc, 0, > - current); > + send_sig_fault_trapno(SIGTRAP, TRAP_UNK, > + (void __user *) regs->pc, 0, current); > return; > > case 2: /* gentrap */ > @@ -335,8 +335,8 @@ do_entIF(unsigned long type, struct pt_regs *regs) > break; > } > > - send_sig_fault(signo, code, (void __user *) regs->pc, regs->r16, > - current); > + send_sig_fault_trapno(signo, code, (void __user *) regs->pc, > + regs->r16, current); > return; > > case 4: /* opDEC */ > @@ -360,9 +360,9 @@ do_entIF(unsigned long type, struct pt_regs *regs) > if (si_code == 0) > return; > if (si_code > 0) { > - send_sig_fault(SIGFPE, si_code, > - (void __user *) regs->pc, 0, > - current); > + send_sig_fault_trapno(SIGFPE, si_code, > + (void __user *) regs->pc, > + 0, current); > return; > } > } > @@ -387,7 +387,7 @@ do_entIF(unsigned long type, struct pt_regs *regs) > ; > } > > - send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)regs->pc, 0, current); > + send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)regs->pc, current); > } > > /* There is an ifdef in the PALcode in MILO that enables a > @@ -402,7 +402,7 @@ do_entDbg(struct pt_regs *regs) > { > die_if_kernel("Instruction fault", regs, 0, NULL); > > - force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)regs->pc, 0); > + force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)regs->pc); > } > > > @@ -964,12 +964,12 @@ do_entUnaUser(void __user * va, unsigned long opcode, > si_code = SEGV_MAPERR; > mmap_read_unlock(mm); > } > - send_sig_fault(SIGSEGV, si_code, va, 0, current); > + send_sig_fault(SIGSEGV, si_code, va, current); > return; > > give_sigbus: > regs->pc -= 4; > - send_sig_fault(SIGBUS, BUS_ADRALN, va, 0, current); > + send_sig_fault(SIGBUS, BUS_ADRALN, va, current); > return; > } > > diff --git a/arch/alpha/mm/fault.c b/arch/alpha/mm/fault.c > index 09172f017efc..eee5102c3d88 100644 > --- a/arch/alpha/mm/fault.c > +++ b/arch/alpha/mm/fault.c > @@ -219,13 +219,13 @@ do_page_fault(unsigned long address, unsigned long mmcsr, > mmap_read_unlock(mm); > /* Send a sigbus, regardless of whether we were in kernel > or user mode. */ > - force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *) address, 0); > + force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *) address); > if (!user_mode(regs)) > goto no_context; > return; > > do_sigsegv: > - force_sig_fault(SIGSEGV, si_code, (void __user *) address, 0); > + force_sig_fault(SIGSEGV, si_code, (void __user *) address); > return; > > #ifdef CONFIG_ALPHA_LARGE_VMALLOC > diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h > index 99a9ab2b169a..6657184cef07 100644 > --- a/include/linux/sched/signal.h > +++ b/include/linux/sched/signal.h > @@ -330,6 +330,8 @@ int force_sig_perf(void __user *addr, u32 type, u64 sig_data); > > int force_sig_ptrace_errno_trap(int errno, void __user *addr); > int force_sig_fault_trapno(int sig, int code, void __user *addr, int trapno); > +int send_sig_fault_trapno(int sig, int code, void __user *addr, int trapno, > + struct task_struct *t); > > extern int send_sig_info(int, struct kernel_siginfo *, struct task_struct *); > extern void force_sigsegv(int sig); > diff --git a/kernel/signal.c b/kernel/signal.c > index 87a374225277..ae06a424aa72 100644 > --- a/kernel/signal.c > +++ b/kernel/signal.c > @@ -1824,6 +1824,23 @@ int force_sig_fault_trapno(int sig, int code, void __user *addr, int trapno) > return force_sig_info(&info); > } > > +/* For the rare architectures that include trap information using > + * si_trapno. > + */ > +int send_sig_fault_trapno(int sig, int code, void __user *addr, int trapno, > + struct task_struct *t) > +{ > + struct kernel_siginfo info; > + > + clear_siginfo(&info); > + info.si_signo = sig; > + info.si_errno = 0; > + info.si_code = code; > + info.si_addr = addr; > + info.si_trapno = trapno; > + return send_sig_info(info.si_signo, &info, t); > +} > + > int kill_pgrp(struct pid *pid, int sig, int priv) > { > int ret; > @@ -3262,6 +3279,10 @@ enum siginfo_layout siginfo_layout(unsigned sig, int si_code) > else if (IS_ENABLED(CONFIG_SPARC) && > (sig == SIGILL) && (si_code == ILL_ILLTRP)) > layout = SIL_FAULT_TRAPNO; > + else if (IS_ENABLED(CONFIG_ALPHA) && > + ((sig == SIGFPE) || > + ((sig == SIGTRAP) && (si_code == TRAP_UNK)))) > + layout = SIL_FAULT_TRAPNO; > #ifdef __ARCH_SI_TRAPNO > else if (layout == SIL_FAULT) > layout = SIL_FAULT_TRAPNO; > -- > 2.20.1 >
