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Ignore spurious KASAN unwind warning

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KASAN could raise a spurious warning if the unwinder started in code
without ORC metadata and tried to access in the KASAN stack frame
redzones.  This was fixed upstream but we can rarely see it in older
kernels.  We can ignore these messages.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2023-11-21 12:03:39 -08:00
parent d812599e6b
commit b552406427
1 changed files with 57 additions and 1 deletions
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58
tests/funcs/filter.sh
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@@ -6,6 +6,61 @@ t_filter_fs()
-e 's@Device: [a-fA-F0-9]*h/[0-9]*d@Device: 0h/0d@g'
}
#
# We can hit a spurious kasan warning that was fixed upstream:
#
# e504e74cc3a2 x86/unwind/orc: Disable KASAN checking in the ORC unwinder, part 2
#
# KASAN can get mad when the unwinder doesn't find ORC metadata and
# wanders up without using frames and hits the KASAN stack red zones.
# We can ignore these messages.
#
# They're bracketed by:
# [ 2687.690127] ==================================================================
# [ 2687.691366] BUG: KASAN: stack-out-of-bounds in get_reg+0x1bc/0x230
# ...
# [ 2687.706220] ==================================================================
# [ 2687.707284] Disabling lock debugging due to kernel taint
#
# That final lock debugging message may not be included.
#
ignore_harmless_unwind_kasan_stack_oob()
{
awk '
BEGIN {
in_soob = 0
soob_nr = 0
}
( !in_soob && $0 ~ /==================================================================/ ) {
in_soob = 1
soob_nr = NR
saved = $0
}
( in_soob == 1 && NR == (soob_nr + 1) ) {
if (match($0, /KASAN: stack-out-of-bounds in get_reg/) != 0) {
in_soob = 2
} else {
in_soob = 0
print saved
}
saved=""
}
( in_soob == 2 && $0 ~ /==================================================================/ ) {
in_soob = 3
soob_nr = NR
}
( in_soob == 3 && NR > soob_nr && $0 !~ /Disabling lock debugging/ ) {
in_soob = 0
}
( !in_soob ) { print $0 }
END {
if (saved) {
print saved
}
}
'
}
#
# Filter out expected messages. Putting messages here implies that
# tests aren't relying on messages to discover failures.. they're
@@ -92,5 +147,6 @@ t_filter_dmesg()
# ignore systemd-journal rotating
re="$re|systemd-journald.*"
egrep -v "($re)"
egrep -v "($re)" | \
ignore_harmless_unwind_kasan_stack_oob
}