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signal/x86/traps: Simplify trap generation

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Update the DO_ERROR macro to take si_code and si_addr values for a siginfo,
removing the need for the fill_trap_info function.

Update do_trap to also take the sicode and si_addr values for a sigininfo
and modify the code to call force_sig when a sicode is not passed in
and to call force_sig_fault when all of the information is present.

Making this a more obvious, simpler and less error prone construction.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-04-16 14:29:39 -05:00
parent afe8448c0d
commit 164881b614
1 changed files with 24 additions and 61 deletions
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85
arch/x86/kernel/traps.c
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@ -240,40 +240,9 @@ static void show_signal(struct task_struct *tsk, int signr,
}
}
static siginfo_t *fill_trap_info(struct pt_regs *regs, int signr, int trapnr,
siginfo_t *info)
{
unsigned long siaddr;
int sicode;
switch (trapnr) {
default:
return SEND_SIG_PRIV;
case X86_TRAP_DE:
sicode = FPE_INTDIV;
siaddr = uprobe_get_trap_addr(regs);
break;
case X86_TRAP_UD:
sicode = ILL_ILLOPN;
siaddr = uprobe_get_trap_addr(regs);
break;
case X86_TRAP_AC:
sicode = BUS_ADRALN;
siaddr = 0;
break;
}
info->si_signo = signr;
info->si_errno = 0;
info->si_code = sicode;
info->si_addr = (void __user *)siaddr;
return info;
}
static void
do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
long error_code, siginfo_t *info)
long error_code, int sicode, void __user *addr)
{
struct task_struct *tsk = current;
@ -283,15 +252,16 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
show_signal(tsk, signr, "trap ", str, regs, error_code);
force_sig_info(signr, info ?: SEND_SIG_PRIV, tsk);
if (!sicode)
force_sig(signr, tsk);
else
force_sig_fault(signr, sicode, addr, tsk);
}
NOKPROBE_SYMBOL(do_trap);
static void do_error_trap(struct pt_regs *regs, long error_code, char *str,
unsigned long trapnr, int signr)
unsigned long trapnr, int signr, int sicode, void __user *addr)
{
siginfo_t info;
RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
/*
@ -304,26 +274,26 @@ static void do_error_trap(struct pt_regs *regs, long error_code, char *str,
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) !=
NOTIFY_STOP) {
cond_local_irq_enable(regs);
clear_siginfo(&info);
do_trap(trapnr, signr, str, regs, error_code,
fill_trap_info(regs, signr, trapnr, &info));
do_trap(trapnr, signr, str, regs, error_code, sicode, addr);
}
}
#define DO_ERROR(trapnr, signr, str, name) \
dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
{ \
do_error_trap(regs, error_code, str, trapnr, signr); \
#define IP ((void __user *)uprobe_get_trap_addr(regs))
#define DO_ERROR(trapnr, signr, sicode, addr, str, name) \
dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
{ \
do_error_trap(regs, error_code, str, trapnr, signr, sicode, addr); \
}
DO_ERROR(X86_TRAP_DE, SIGFPE, "divide error", divide_error)
DO_ERROR(X86_TRAP_OF, SIGSEGV, "overflow", overflow)
DO_ERROR(X86_TRAP_UD, SIGILL, "invalid opcode", invalid_op)
DO_ERROR(X86_TRAP_OLD_MF, SIGFPE, "coprocessor segment overrun",coprocessor_segment_overrun)
DO_ERROR(X86_TRAP_TS, SIGSEGV, "invalid TSS", invalid_TSS)
DO_ERROR(X86_TRAP_NP, SIGBUS, "segment not present", segment_not_present)
DO_ERROR(X86_TRAP_SS, SIGBUS, "stack segment", stack_segment)
DO_ERROR(X86_TRAP_AC, SIGBUS, "alignment check", alignment_check)
DO_ERROR(X86_TRAP_DE, SIGFPE, FPE_INTDIV, IP, "divide error", divide_error)
DO_ERROR(X86_TRAP_OF, SIGSEGV, 0, NULL, "overflow", overflow)
DO_ERROR(X86_TRAP_UD, SIGILL, ILL_ILLOPN, IP, "invalid opcode", invalid_op)
DO_ERROR(X86_TRAP_OLD_MF, SIGFPE, 0, NULL, "coprocessor segment overrun", coprocessor_segment_overrun)
DO_ERROR(X86_TRAP_TS, SIGSEGV, 0, NULL, "invalid TSS", invalid_TSS)
DO_ERROR(X86_TRAP_NP, SIGBUS, 0, NULL, "segment not present", segment_not_present)
DO_ERROR(X86_TRAP_SS, SIGBUS, 0, NULL, "stack segment", stack_segment)
DO_ERROR(X86_TRAP_AC, SIGBUS, BUS_ADRALN, NULL, "alignment check", alignment_check)
#undef IP
#ifdef CONFIG_VMAP_STACK
__visible void __noreturn handle_stack_overflow(const char *message,
@ -540,7 +510,7 @@ dotraplinkage void do_bounds(struct pt_regs *regs, long error_code)
* up here if the kernel has MPX turned off at compile
* time..
*/
do_trap(X86_TRAP_BR, SIGSEGV, "bounds", regs, error_code, NULL);
do_trap(X86_TRAP_BR, SIGSEGV, "bounds", regs, error_code, 0, NULL);
}
dotraplinkage void
@ -624,7 +594,7 @@ dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code)
goto exit;
cond_local_irq_enable(regs);
do_trap(X86_TRAP_BP, SIGTRAP, "int3", regs, error_code, NULL);
do_trap(X86_TRAP_BP, SIGTRAP, "int3", regs, error_code, 0, NULL);
cond_local_irq_disable(regs);
exit:
@ -935,20 +905,13 @@ NOKPROBE_SYMBOL(do_device_not_available);
#ifdef CONFIG_X86_32
dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
{
siginfo_t info;
RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
local_irq_enable();
clear_siginfo(&info);
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_BADSTK;
info.si_addr = NULL;
if (notify_die(DIE_TRAP, "iret exception", regs, error_code,
X86_TRAP_IRET, SIGILL) != NOTIFY_STOP) {
do_trap(X86_TRAP_IRET, SIGILL, "iret exception", regs, error_code,
&info);
ILL_BADSTK, (void __user *)NULL);
}
}
#endif