Johannes Berg 4f7dad73df um: time-travel: fix time corruption ...

[ Upstream commit abe4eaa8618bb36c2b33e9cdde0499296a23448c ]

In 'basic' time-travel mode (without =inf-cpu or =ext), we
still get timer interrupts. These can happen at arbitrary
points in time, i.e. while in timer_read(), which pushes
time forward just a little bit. Then, if we happen to get
the interrupt after calculating the new time to push to,
but before actually finishing that, the interrupt will set
the time to a value that's incompatible with the forward,
and we'll crash because time goes backwards when we do the
forwarding.

Fix this by reading the time_travel_time, calculating the
adjustment, and doing the adjustment all with interrupts
disabled.

Reported-by: Vincent Whitchurch <Vincent.Whitchurch@axis.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-02-05 20:12:57 +00:00

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skas

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asm-offsets.c

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config.c.in

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dtb.c

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dyn.lds.S

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early_printk.c

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exec.c

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exitcode.c

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gprof_syms.c

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initrd.c

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ioport.c

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irq.c

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kmsg_dump.c

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ksyms.c

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load_file.c

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maccess.c

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Makefile

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mem.c

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physmem.c

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process.c

um: Fix naming clash between UML and scheduler

2024-02-05 20:12:57 +00:00

ptrace.c

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reboot.c

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sigio.c

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signal.c

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stacktrace.c

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sysrq.c

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time.c

um: time-travel: fix time corruption

2024-02-05 20:12:57 +00:00

tlb.c

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trap.c

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um_arch.c

um/cpu: Switch to arch_cpu_finalize_init()

2023-08-08 20:03:47 +02:00

um_arch.h

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umid.c

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uml.lds.S

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vmlinux.lds.S

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