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signal: fix deadlock

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Matheus
2025-12-28 21:18:51 -03:00
parent aceaab3ddf
commit c3ce577091
1 changed files with 16 additions and 10 deletions
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kernel-src/sys/signal.c
+16 -10
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@@ -529,8 +529,9 @@ bool signal_check(struct thread_t *thread, context_t *context, bool syscall, uin
__assert(!"unsupported signal action");
}
} else {
// execute handler
ARCH_CONTEXT_THREADSAVE(thread, context);
// execute handler TODO THREAD_LOAD_CONTEXT
context_t old_context;
memcpy(&old_context, context, sizeof(old_context));
void *altstack = NULL;
// figure out the stack we will be running the signal handler in
@@ -581,14 +582,6 @@ bool signal_check(struct thread_t *thread, context_t *context, bool syscall, uin
if (signal == SIGSEGV)
sigframe->siginfo.__si_fields.__sigfault.si_addr = (void *)CTX_TRAP_ADDR(context);
if (usercopy_touser(stack, sigframe, ARCH_SIGFRAME_SIZE)) {
printf("signal: bad user stack %p (altstack %p) handling signal %d trapno %lu\n", stack, altstack, signal, sigframe->mcontext.gregs[MCONTEXT_REG_TRAPNO]);
THREAD_LEAVE(thread);
PROCESS_LEAVE(proc);
interrupt_set(true);
proc_terminate(SIGSEGV);
}
// configure new thread signal mask
if ((action->flags & SA_NODEFER) == 0)
SIGNAL_SETON(&thread->signals.mask, signal);
@@ -613,6 +606,19 @@ bool signal_check(struct thread_t *thread, context_t *context, bool syscall, uin
memset(action, 0, sizeof(sigaction_t));
*need_context_switch = true;
THREAD_LEAVE(thread);
PROCESS_LEAVE(proc);
// copy the sigframe to the stack AFTER releasing the locks
// as it might take a page fault and result in sleeping while holding it
// and by this point, we don't need to hold it anymore
if (usercopy_touser(stack, sigframe, ARCH_SIGFRAME_SIZE)) {
printf("signal: bad user stack %p (altstack %p) handling signal %d trapno %lu\n", stack, altstack, signal, sigframe->mcontext.gregs[MCONTEXT_REG_TRAPNO]);
interrupt_set(true);
proc_terminate(SIGSEGV);
}
return retry;
}
leave: