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signal/alpha: si_trapno is only used with SIGFPE and SIGTRAP TRAP_UNK

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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_-_@fess.ebiederm.org
v2: https://lkml.kernel.org/r/20210505141101.11519-7-ebiederm@xmission.com
Link: https://lkml.kernel.org/r/87h7gvxx7l.fsf_-_@disp2133
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2021-05-28 14:15:51 -05:00
parent 2c9f7eaf08
commit 7de5f68d49
7 changed files with 41 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/alpha/include/uapi/asm/siginfo.h
View File

@ -2,8 +2,6 @@
#ifndef _ALPHA_SIGINFO_H
#define _ALPHA_SIGINFO_H
#define __ARCH_SI_TRAPNO
#include <asm-generic/siginfo.h>
#endif

2
arch/alpha/kernel/osf_sys.c
View File

@ -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);
}

4
arch/alpha/kernel/signal.c
View File

@ -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;

26
arch/alpha/kernel/traps.c
View File

@ -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 @@ give_sigsegv:
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;
}

4
arch/alpha/mm/fault.c
View File

@ -219,13 +219,13 @@ retry:
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

2
include/linux/sched/signal.h
View File

@ -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);

21
kernel/signal.c
View File

@ -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;