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Kernel+LibC: A lot of the signal handling code was off-by-one.

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There is no signal 0. The valid ones are 1 (SIGHUP) through 31 (SIGSYS)
Found by PVS-Studio.
This commit is contained in:
Andreas Kling 2019-08-01 11:00:36 +02:00
parent bd08664f05
commit be4d33fb2c
2 changed files with 10 additions and 10 deletions
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14
Kernel/Thread.cpp
View file

@ -204,7 +204,7 @@ void Thread::send_signal(u8 signal, Process* sender)
else
dbgprintf("signal: kernel sent %d to %s(%u)\n", signal, process().name().characters(), pid());
m_pending_signals |= 1 << signal;
m_pending_signals |= 1 << (signal - 1);
}
bool Thread::has_unmasked_pending_signals() const
@ -218,9 +218,9 @@ ShouldUnblockThread Thread::dispatch_one_pending_signal()
u32 signal_candidates = m_pending_signals & ~m_signal_mask;
ASSERT(signal_candidates);
u8 signal = 0;
u8 signal = 1;
for (; signal < 32; ++signal) {
if (signal_candidates & (1 << signal)) {
if (signal_candidates & (1 << (signal - 1))) {
break;
}
}
@ -294,7 +294,7 @@ bool Thread::should_ignore_signal(u8 signal) const
ShouldUnblockThread Thread::dispatch_signal(u8 signal)
{
ASSERT_INTERRUPTS_DISABLED();
ASSERT(signal < 32);
ASSERT(signal > 0 && signal <= 32);
#ifdef SIGNAL_DEBUG
kprintf("dispatch_signal %s(%u) <- %u\n", process().name().characters(), pid(), signal);
@ -305,7 +305,7 @@ ShouldUnblockThread Thread::dispatch_signal(u8 signal)
ASSERT(!(action.flags & SA_SIGINFO));
// Mark this signal as handled.
m_pending_signals &= ~(1 << signal);
m_pending_signals &= ~(1 << (signal - 1));
if (signal == SIGSTOP) {
set_state(Stopped);
@ -348,9 +348,9 @@ ShouldUnblockThread Thread::dispatch_signal(u8 signal)
u32 old_signal_mask = m_signal_mask;
u32 new_signal_mask = action.mask;
if (action.flags & SA_NODEFER)
new_signal_mask &= ~(1 << signal);
new_signal_mask &= ~(1 << (signal - 1));
else
new_signal_mask |= 1 << signal;
new_signal_mask |= 1 << (signal - 1);
m_signal_mask |= new_signal_mask;

6
Libraries/LibC/signal.cpp
View file

@ -63,7 +63,7 @@ int sigaddset(sigset_t* set, int sig)
errno = EINVAL;
return -1;
}
*set |= 1 << (sig);
*set |= 1 << (sig - 1);
return 0;
}
@ -73,7 +73,7 @@ int sigdelset(sigset_t* set, int sig)
errno = EINVAL;
return -1;
}
*set &= ~(1 << (sig));
*set &= ~(1 << (sig - 1));
return 0;
}
@ -83,7 +83,7 @@ int sigismember(const sigset_t* set, int sig)
errno = EINVAL;
return -1;
}
if (*set & (1 << (sig)))
if (*set & (1 << (sig - 1)))
return 1;
return 0;
}