/* * txx9wdt: A Hardware Watchdog Driver for TXx9 SoCs * * Copyright (C) 2007 Atsushi Nemoto * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #define WD_TIMER_CCD 7 /* 1/256 */ #define WD_TIMER_CLK (clk_get_rate(txx9_imclk) / (2 << WD_TIMER_CCD)) #define WD_MAX_TIMEOUT ((0xffffffff >> (32 - TXX9_TIMER_BITS)) / WD_TIMER_CLK) #define TIMER_MARGIN 60 /* Default is 60 seconds */ static unsigned int timeout = TIMER_MARGIN; /* in seconds */ module_param(timeout, uint, 0); MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. " "(0wtmr); spin_unlock(&txx9_lock); return 0; } static int txx9wdt_start(struct watchdog_device *wdt_dev) { spin_lock(&txx9_lock); __raw_writel(WD_TIMER_CLK * wdt_dev->timeout, &txx9wdt_reg->cpra); __raw_writel(WD_TIMER_CCD, &txx9wdt_reg->ccdr); __raw_writel(0, &txx9wdt_reg->tisr); /* clear pending interrupt */ __raw_writel(TXx9_TMTCR_TCE | TXx9_TMTCR_CCDE | TXx9_TMTCR_TMODE_WDOG, &txx9wdt_reg->tcr); __raw_writel(TXx9_TMWTMR_TWIE | TXx9_TMWTMR_TWC, &txx9wdt_reg->wtmr); spin_unlock(&txx9_lock); return 0; } static int txx9wdt_stop(struct watchdog_device *wdt_dev) { spin_lock(&txx9_lock); __raw_writel(TXx9_TMWTMR_WDIS, &txx9wdt_reg->wtmr); __raw_writel(__raw_readl(&txx9wdt_reg->tcr) & ~TXx9_TMTCR_TCE, &txx9wdt_reg->tcr); spin_unlock(&txx9_lock); return 0; } static int txx9wdt_set_timeout(struct watchdog_device *wdt_dev, unsigned int new_timeout) { wdt_dev->timeout = new_timeout; txx9wdt_stop(wdt_dev); txx9wdt_start(wdt_dev); return 0; } static const struct watchdog_info txx9wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .identity = "Hardware Watchdog for TXx9", }; static const struct watchdog_ops txx9wdt_ops = { .owner = THIS_MODULE, .start = txx9wdt_start, .stop = txx9wdt_stop, .ping = txx9wdt_ping, .set_timeout = txx9wdt_set_timeout, }; static struct watchdog_device txx9wdt = { .info = &txx9wdt_info, .ops = &txx9wdt_ops, }; static int __init txx9wdt_probe(struct platform_device *dev) { struct resource *res; int ret; txx9_imclk = clk_get(NULL, "imbus_clk"); if (IS_ERR(txx9_imclk)) { ret = PTR_ERR(txx9_imclk); txx9_imclk = NULL; goto exit; } ret = clk_prepare_enable(txx9_imclk); if (ret) { clk_put(txx9_imclk); txx9_imclk = NULL; goto exit; } res = platform_get_resource(dev, IORESOURCE_MEM, 0); txx9wdt_reg = devm_ioremap_resource(&dev->dev, res); if (IS_ERR(txx9wdt_reg)) { ret = PTR_ERR(txx9wdt_reg); goto exit; } if (timeout < 1 || timeout > WD_MAX_TIMEOUT) timeout = TIMER_MARGIN; txx9wdt.timeout = timeout; txx9wdt.min_timeout = 1; txx9wdt.max_timeout = WD_MAX_TIMEOUT; txx9wdt.parent = &dev->dev; watchdog_set_nowayout(&txx9wdt, nowayout); ret = watchdog_register_device(&txx9wdt); if (ret) goto exit; pr_info("Hardware Watchdog Timer: timeout=%d sec (max %ld) (nowayout= %d)\n", timeout, WD_MAX_TIMEOUT, nowayout); return 0; exit: if (txx9_imclk) { clk_disable_unprepare(txx9_imclk); clk_put(txx9_imclk); } return ret; } static int __exit txx9wdt_remove(struct platform_device *dev) { watchdog_unregister_device(&txx9wdt); clk_disable_unprepare(txx9_imclk); clk_put(txx9_imclk); return 0; } static void txx9wdt_shutdown(struct platform_device *dev) { txx9wdt_stop(&txx9wdt); } static struct platform_driver txx9wdt_driver = { .remove = __exit_p(txx9wdt_remove), .shutdown = txx9wdt_shutdown, .driver = { .name = "txx9wdt", }, }; module_platform_driver_probe(txx9wdt_driver, txx9wdt_probe); MODULE_DESCRIPTION("TXx9 Watchdog Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:txx9wdt"); f
authorPeter Zijlstra <peterz@infradead.org>2017-01-26 16:39:55 +0100
committerIngo Molnar <mingo@kernel.org>2017-01-30 11:41:25 +0100
commita76a82a3e38c8d3fb6499e3dfaeb0949241ab588 (patch)
treeb5bc906278fe1ac66d75de984d26bf59b43b3ed8 /tools/testing/selftests/nsfs/Makefile
parent566cf877a1fcb6d6dc0126b076aad062054c2637 (diff)
perf/core: Fix use-after-free bug
Dmitry reported a KASAN use-after-free on event->group_leader. It turns out there's a hole in perf_remove_from_context() due to event_function_call() not calling its function when the task associated with the event is already dead. In this case the event will have been detached from the task, but the grouping will have been retained, such that group operations might still work properly while there are live child events etc. This does however mean that we can miss a perf_group_detach() call when the group decomposes, this in turn can then lead to use-after-free. Fix it by explicitly doing the group detach if its still required. Reported-by: Dmitry Vyukov <dvyukov@google.com> Tested-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org # v4.5+ Cc: syzkaller <syzkaller@googlegroups.com> Fixes: 63b6da39bb38 ("perf: Fix perf_event_exit_task() race") Link: http://lkml.kernel.org/r/20170126153955.GD6515@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/testing/selftests/nsfs/Makefile')