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kernel/arm: send SIGSEGV to processes

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On second thought, handle unknown faults caused by processes by sending
SIGSEGV to them instead of bringing the whole system to a grind.

Change-Id: Ieed5bb06910ab0c8eef1e68b0b4eec680867acd3
This commit is contained in:
Arne Welzel 2018-03-22 14:59:20 +01:00 committed by Lionel Sambuc
parent 729a263d5f
commit 94ec38dc78
1 changed files with 19 additions and 17 deletions
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36
minix/kernel/arch/earm/exception.c
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@ -116,25 +116,27 @@ data_abort(int is_nested, struct proc *pr, reg_t *saved_lr,
/* Extract fault status bit [0:3, 10] from DFSR */ /* Extract fault status bit [0:3, 10] from DFSR */
u32_t fs = dfsr & 0x0F; u32_t fs = dfsr & 0x0F;
fs |= ((dfsr >> 6) & 0x10); fs |= ((dfsr >> 6) & 0x10);
if (is_alignment_fault(fs)) {
if (is_nested) { /* Translation and permission faults are handled as pagefaults. */
printf("KERNEL: alignment fault dfar=0x%lx\n", dfar); if (is_trans_fault(fs) || is_perm_fault(fs)) {
inkernel_disaster(pr, saved_lr, ep, is_nested);
}
/* Send SIGBUS to violating process. */
cause_sig(proc_nr(pr), SIGBUS);
return;
} else if (is_translation_fault(fs) || is_permission_fault(fs)) {
/* Ask VM to handle translation and permission faults as pagefaults */
pagefault(pr, saved_lr, is_nested, dfar, dfsr); pagefault(pr, saved_lr, is_nested, dfar, dfsr);
return; } else if (!is_nested) {
} else { /* A user process caused some other kind of data abort. */
/* Die on unknown things... */ int signum = SIGSEGV;
printf("KERNEL: unhandled data abort dfar=0x%lx dfsr=0x%lx "
"fs=0x%lx is_nested=%d\n", dfar, dfsr, fs, is_nested); if (is_align_fault(fs)) {
panic("unhandled data abort"); signum = SIGBUS;
} else {
printf("KERNEL: unknown data abort by proc %d sending "
"SIGSEGV (dfar=0x%lx dfsr=0x%lx fs=0x%lx)\n",
proc_nr(pr), dfar, dfsr, fs);
}
cause_sig(proc_nr(pr), signum);
} else { /* is_nested */
printf("KERNEL: inkernel data abort - disaster (dfar=0x%lx "
"dfsr=0x%lx fs=0x%lx)\n", dfar, dfsr, fs);
inkernel_disaster(pr, saved_lr, ep, is_nested);
} }
NOT_REACHABLE;
} }
static void inkernel_disaster(struct proc *saved_proc, static void inkernel_disaster(struct proc *saved_proc,