329409aeda
This patch provides stacktrace filtering feature. The stacktrace filter allows failing only for the caller you are interested in. For example someone may want to inject kmalloc() failures into only e100 module. they want to inject not only direct kmalloc() call, but also indirect allocation, too. - e100_poll --> netif_receive_skb --> packet_rcv_spkt --> skb_clone --> kmem_cache_alloc This patch enables to detect function calls like this by stacktrace and inject failures. The script Documentaion/fault-injection/failmodule.sh helps it. The range of text section of loaded e100 is expected to be [/sys/module/e100/sections/.text, /sys/module/e100/sections/.exit.text) So failmodule.sh stores these values into /debug/failslab/address-start and /debug/failslab/address-end. The maximum stacktrace depth is specified by /debug/failslab/stacktrace-depth. Please see the example that demonstrates how to inject slab allocation failures only for a specific module in Documentation/fault-injection/fault-injection.txt [dwm@meer.net: reject failure if any caller lies within specified range] Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Don Mullis <dwm@meer.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
84 lines
2 KiB
C
84 lines
2 KiB
C
#ifndef _LINUX_FAULT_INJECT_H
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#define _LINUX_FAULT_INJECT_H
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#ifdef CONFIG_FAULT_INJECTION
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#include <linux/types.h>
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#include <linux/debugfs.h>
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#include <asm/atomic.h>
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/*
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* For explanation of the elements of this struct, see
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* Documentation/fault-injection/fault-injection.txt
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*/
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struct fault_attr {
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unsigned long probability;
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unsigned long interval;
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atomic_t times;
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atomic_t space;
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unsigned long verbose;
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u32 task_filter;
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unsigned long stacktrace_depth;
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unsigned long require_start;
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unsigned long require_end;
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unsigned long reject_start;
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unsigned long reject_end;
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unsigned long count;
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#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
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struct {
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struct dentry *dir;
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struct dentry *probability_file;
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struct dentry *interval_file;
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struct dentry *times_file;
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struct dentry *space_file;
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struct dentry *verbose_file;
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struct dentry *task_filter_file;
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struct dentry *stacktrace_depth_file;
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struct dentry *require_start_file;
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struct dentry *require_end_file;
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struct dentry *reject_start_file;
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struct dentry *reject_end_file;
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} dentries;
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#endif
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};
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#define FAULT_ATTR_INITIALIZER { \
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.interval = 1, \
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.times = ATOMIC_INIT(1), \
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.require_end = ULONG_MAX, \
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.stacktrace_depth = 32, \
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}
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#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
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int setup_fault_attr(struct fault_attr *attr, char *str);
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void should_fail_srandom(unsigned long entropy);
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int should_fail(struct fault_attr *attr, ssize_t size);
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#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
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int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
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void cleanup_fault_attr_dentries(struct fault_attr *attr);
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#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
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static inline int init_fault_attr_dentries(struct fault_attr *attr,
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const char *name)
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{
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return -ENODEV;
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}
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static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
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{
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}
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#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
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#endif /* CONFIG_FAULT_INJECTION */
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#endif /* _LINUX_FAULT_INJECT_H */
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