Private bug reported:
Description:
Commit efda1b5d87cb ("acpi, nfit, libnvdimm: fix / harden ars_status output
length handling")
Introduced additional hardening for ambiguity in the ACPI spec for
ars_status output sizing. However, it had a couple of cases mixed up.
Where it should have been checking for (and returning) "out_field[1] -
4" it was using "out_field[1] - 8" and vice versa.
This caused a four byte discrepancy in the buffer size passed on to
the command handler, and in some cases, this caused memory corruption
like:
./daxdev-errors.sh: line 76: 24104 Aborted (core dumped) ./daxdev-errors
$busdev $region
malloc(): memory corruption
Program received signal SIGABRT, Aborted.
[...]
#5 0x00007ffff7865a2e in calloc () from /lib64/libc.so.6
#6 0x00007ffff7bc2970 in ndctl_bus_cmd_new_ars_status
(ars_cap=ars_cap@entry=0x6153b0) at ars.c:136
#7 0x0000000000401644 in check_ars_status (check=0x7fffffffdeb0, bus=0x604c20)
at daxdev-errors.c:144
#8 test_daxdev_clear_error (region_name=<optimized out>, bus_name=<optimized
out>)
at daxdev-errors.c:332
Target Kernel: 4.19
Target Release: 18.10
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: intel-kernel-18.10
** Information type changed from Public to Private
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https://bugs.launchpad.net/bugs/1787090
Title:
[AEP-bug] libnvdimm: Fix a bug that overwrites and corrupts user
memory in an ARS_STATUS command
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