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signal/arm: Push siginfo generation into arm_notify_die

Browse Source 
In arm_notify_die call force_sig_fault to let the generic
code handle siginfo generation.

This removes some boiler plate making the code easier to
maintain in the long run.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-04-16 13:25:24 -05:00
parent c852680959
commit 05e792e30e
4 changed files with 30 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/include/asm/bug.h
View File

@ -62,8 +62,8 @@ do { \
struct pt_regs;
void die(const char *msg, struct pt_regs *regs, int err);
struct siginfo;
void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
void arm_notify_die(const char *str, struct pt_regs *regs,
int signo, int si_code, void __user *addr,
unsigned long err, unsigned long trap);
#ifdef CONFIG_ARM_LPAE

16
arch/arm/kernel/swp_emulate.c
View File

@ -98,22 +98,20 @@ static int proc_status_show(struct seq_file *m, void *v)
*/
static void set_segfault(struct pt_regs *regs, unsigned long addr)
{
siginfo_t info;
int si_code;
clear_siginfo(&info);
down_read(&current->mm->mmap_sem);
if (find_vma(current->mm, addr) == NULL)
info.si_code = SEGV_MAPERR;
si_code = SEGV_MAPERR;
else
info.si_code = SEGV_ACCERR;
si_code = SEGV_ACCERR;
up_read(&current->mm->mmap_sem);
info.si_signo = SIGSEGV;
info.si_errno = 0;
info.si_addr = (void *) instruction_pointer(regs);
pr_debug("SWP{B} emulation: access caused memory abort!\n");
arm_notify_die("Illegal memory access", regs, &info, 0, 0);
arm_notify_die("Illegal memory access", regs,
SIGSEGV, si_code,
(void __user *)instruction_pointer(regs),
0, 0);
abtcounter++;
}

63
arch/arm/kernel/traps.c
View File

@ -365,13 +365,14 @@ void die(const char *str, struct pt_regs *regs, int err)
}
void arm_notify_die(const char *str, struct pt_regs *regs,
struct siginfo *info, unsigned long err, unsigned long trap)
int signo, int si_code, void __user *addr,
unsigned long err, unsigned long trap)
{
if (user_mode(regs)) {
current->thread.error_code = err;
current->thread.trap_no = trap;
force_sig_info(info->si_signo, info, current);
force_sig_fault(signo, si_code, addr, current);
} else {
die(str, regs, err);
}
@ -438,10 +439,8 @@ int call_undef_hook(struct pt_regs *regs, unsigned int instr)
asmlinkage void do_undefinstr(struct pt_regs *regs)
{
unsigned int instr;
siginfo_t info;
void __user *pc;
clear_siginfo(&info);
pc = (void __user *)instruction_pointer(regs);
if (processor_mode(regs) == SVC_MODE) {
@ -485,13 +484,8 @@ asmlinkage void do_undefinstr(struct pt_regs *regs)
dump_instr(KERN_INFO, regs);
}
#endif
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLOPC;
info.si_addr = pc;
arm_notify_die("Oops - undefined instruction", regs, &info, 0, 6);
arm_notify_die("Oops - undefined instruction", regs,
SIGILL, ILL_ILLOPC, pc, 0, 6);
}
NOKPROBE_SYMBOL(do_undefinstr)
@ -539,9 +533,6 @@ asmlinkage void bad_mode(struct pt_regs *regs, int reason)
static int bad_syscall(int n, struct pt_regs *regs)
{
siginfo_t info;
clear_siginfo(&info);
if ((current->personality & PER_MASK) != PER_LINUX) {
send_sig(SIGSEGV, current, 1);
return regs->ARM_r0;
@ -555,13 +546,10 @@ static int bad_syscall(int n, struct pt_regs *regs)
}
#endif
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLTRP;
info.si_addr = (void __user *)instruction_pointer(regs) -
(thumb_mode(regs) ? 2 : 4);
arm_notify_die("Oops - bad syscall", regs, &info, n, 0);
arm_notify_die("Oops - bad syscall", regs, SIGILL, ILL_ILLTRP,
(void __user *)instruction_pointer(regs) -
(thumb_mode(regs) ? 2 : 4),
n, 0);
return regs->ARM_r0;
}
@ -607,20 +595,13 @@ do_cache_op(unsigned long start, unsigned long end, int flags)
#define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE)
asmlinkage int arm_syscall(int no, struct pt_regs *regs)
{
siginfo_t info;
clear_siginfo(&info);
if ((no >> 16) != (__ARM_NR_BASE>> 16))
return bad_syscall(no, regs);
switch (no & 0xffff) {
case 0: /* branch through 0 */
info.si_signo = SIGSEGV;
info.si_errno = 0;
info.si_code = SEGV_MAPERR;
info.si_addr = NULL;
arm_notify_die("branch through zero", regs, &info, 0, 0);
arm_notify_die("branch through zero", regs,
SIGSEGV, SEGV_MAPERR, NULL, 0, 0);
return 0;
case NR(breakpoint): /* SWI BREAK_POINT */
@ -688,13 +669,10 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
}
}
#endif
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLTRP;
info.si_addr = (void __user *)instruction_pointer(regs) -
(thumb_mode(regs) ? 2 : 4);
arm_notify_die("Oops - bad syscall(2)", regs, &info, no, 0);
arm_notify_die("Oops - bad syscall(2)", regs, SIGILL, ILL_ILLTRP,
(void __user *)instruction_pointer(regs) -
(thumb_mode(regs) ? 2 : 4),
no, 0);
return 0;
}
@ -744,9 +722,6 @@ asmlinkage void
baddataabort(int code, unsigned long instr, struct pt_regs *regs)
{
unsigned long addr = instruction_pointer(regs);
siginfo_t info;
clear_siginfo(&info);
#ifdef CONFIG_DEBUG_USER
if (user_debug & UDBG_BADABORT) {
@ -757,12 +732,8 @@ baddataabort(int code, unsigned long instr, struct pt_regs *regs)
}
#endif
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLOPC;
info.si_addr = (void __user *)addr;
arm_notify_die("unknown data abort code", regs, &info, instr, 0);
arm_notify_die("unknown data abort code", regs,
SIGILL, ILL_ILLOPC, (void __user *)addr, instr, 0);
}
void __readwrite_bug(const char *fn)

18
arch/arm/mm/fault.c
View File

@ -554,7 +554,6 @@ asmlinkage void
do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
{
const struct fsr_info *inf = fsr_info + fsr_fs(fsr);
struct siginfo info;
if (!inf->fn(addr, fsr & ~FSR_LNX_PF, regs))
return;
@ -563,12 +562,8 @@ do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
inf->name, fsr, addr);
show_pte(current->mm, addr);
clear_siginfo(&info);
info.si_signo = inf->sig;
info.si_errno = 0;
info.si_code = inf->code;
info.si_addr = (void __user *)addr;
arm_notify_die("", regs, &info, fsr, 0);
arm_notify_die("", regs, inf->sig, inf->code, (void __user *)addr,
fsr, 0);
}
void __init
@ -588,7 +583,6 @@ asmlinkage void
do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
{
const struct fsr_info *inf = ifsr_info + fsr_fs(ifsr);
struct siginfo info;
if (!inf->fn(addr, ifsr | FSR_LNX_PF, regs))
return;
@ -596,12 +590,8 @@ do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
pr_alert("Unhandled prefetch abort: %s (0x%03x) at 0x%08lx\n",
inf->name, ifsr, addr);
clear_siginfo(&info);
info.si_signo = inf->sig;
info.si_errno = 0;
info.si_code = inf->code;
info.si_addr = (void __user *)addr;
arm_notify_die("", regs, &info, ifsr, 0);
arm_notify_die("", regs, inf->sig, inf->code, (void __user *)addr,
ifsr, 0);
}
/*