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| author | Johannes Berg <johannes.berg@intel.com> | 2023-10-25 22:45:05 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2024-01-05 00:29:51 +0100 |
| commit | abe4eaa8618bb36c2b33e9cdde0499296a23448c (patch) | |
| tree | c1f1c3df07fbaded8ac87c696bda05532939223e /tools/testing/selftests/bpf/prog_tests/recursion.c | |
| parent | 7d748f60a4b82b50bf25fad1bd42d33f049f76aa (diff) | |
um: time-travel: fix time corruption
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>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/recursion.c')
0 files changed, 0 insertions, 0 deletions