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Based on a change recommended by Mark Shulte:

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Signal handlers maybe run with interrupts enabled or disabled, depending on how the task the received the signal was blocked. (i.e.: If sem_wait() is called, then we disable interrupts, then block the currently running task). This could be dangerous, because user code would be running with interrupts disabled.

This change forces interrupts to be enabled in up_sigdeliver() before executing the signal handler calling up_irq_enable() explicitly.  This is safe because, when we return to normal execution, interrupts will be restored to their previous state when the signal handler returns.
This commit is contained in:
Gregory Nutt
2018-06-06 09:54:30 -06:00
parent 9222f50e1c
commit 977d41d519
20 changed files with 134 additions and 108 deletions
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arch/misoc/src/lm32/lm32_sigdeliver.c
+7 -3
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@@ -1,7 +1,7 @@
/****************************************************************************
* arch/misoc/src/lm32/lm32_sigdeliver.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Copyright (C) 2016, 2018 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -101,9 +101,13 @@ void lm32_sigdeliver(void)
sigdeliver = rtcb->xcp.sigdeliver;
rtcb->xcp.sigdeliver = NULL;
/* Then restore the task interrupt state */
#ifndef CONFIG_SUPPRESS_INTERRUPTS
/* Then make sure that interrupts are enabled. Signal handlers must always
* run with interrupts enabled.
*/
up_irq_restore((irqstate_t)regs[REG_INT_CTX]);
up_irq_enable();
#endif
/* Deliver the signals */