f211036cf3
path_lookupat() is capable of safely reading unampped VAs. If an unmapped VA is read whilst the function is being called, the resulting page fault will get re-directed to __do_page_fault(), which will call fixup_exception() to handle the aforementioned unmapped VA read. Now, for an OS running in a VM, let's say that memory was still mapped at S1 but lent to another VM (i.e. unmapped at S2 for the given VM). The reading of an unmapped VA in path_lookupat() still needs to be handled. For hypervisors that inject an abort leading to a do_sea() call, call fixup_exception() from do_sea() if trace_android_vh_try_fixup_sea() indicates that we can do so. Bug: 320358381 Change-Id: I0aedcd954f08e3011b27524f9a7b038debbb246d Signed-off-by: Chris Goldsworthy <quic_cgoldswo@quicinc.com>
51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM fault
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#define TRACE_INCLUDE_PATH trace/hooks
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#if !defined(_TRACE_HOOK_FAULT_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_HOOK_FAULT_H
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#include <linux/tracepoint.h>
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#include <trace/hooks/vendor_hooks.h>
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/*
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* Following tracepoints are not exported in tracefs and provide a
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* mechanism for vendor modules to hook and extend functionality
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*/
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#ifdef __GENKSYMS__
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struct pt_regs;
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#else
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/* struct pt_regs */
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#include <asm/ptrace.h>
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#endif /* __GENKSYMS__ */
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DECLARE_RESTRICTED_HOOK(android_rvh_die_kernel_fault,
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TP_PROTO(struct pt_regs *regs, unsigned int esr, unsigned long addr, const char *msg),
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TP_ARGS(regs, esr, addr, msg), 1);
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DECLARE_RESTRICTED_HOOK(android_rvh_do_sea,
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TP_PROTO(struct pt_regs *regs, unsigned int esr, unsigned long addr, const char *msg),
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TP_ARGS(regs, esr, addr, msg), 1);
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DECLARE_RESTRICTED_HOOK(android_rvh_do_mem_abort,
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TP_PROTO(struct pt_regs *regs, unsigned int esr, unsigned long addr, const char *msg),
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TP_ARGS(regs, esr, addr, msg), 1);
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DECLARE_RESTRICTED_HOOK(android_rvh_do_sp_pc_abort,
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TP_PROTO(struct pt_regs *regs, unsigned int esr, unsigned long addr, bool user),
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TP_ARGS(regs, esr, addr, user),
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TP_CONDITION(!user));
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DECLARE_HOOK(android_vh_handle_tlb_conf,
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TP_PROTO(unsigned long addr, unsigned int esr, int *ret),
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TP_ARGS(addr, esr, ret));
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/* macro versions of hooks are no longer required */
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DECLARE_HOOK(android_vh_try_fixup_sea,
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TP_PROTO(unsigned long addr, unsigned long esr, struct pt_regs *regs,
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bool *can_fixup),
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TP_ARGS(addr, esr, regs, can_fixup));
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#endif /* _TRACE_HOOK_FAULT_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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