This bug was fixed in the package linux - 5.4.0-42.46
---------------
linux (5.4.0-42.46) focal; urgency=medium
* focal/linux: 5.4.0-42.46 -proposed tracker (LP: #1887069)
* linux 4.15.0-109-generic network DoS regression vs -108 (LP: #1886668)
- SAUCE: Revert "netprio_cgroup: Fix unlimited memory leak of v2 cgroups"
linux (5.4.0-41.45) focal; urgency=medium
* focal/linux: 5.4.0-41.45 -proposed tracker (LP: #1885855)
* Packaging resync (LP: #1786013)
- update dkms package versions
* CVE-2019-19642
- kernel/relay.c: handle alloc_percpu returning NULL in relay_open
* CVE-2019-16089
- SAUCE: nbd_genl_status: null check for nla_nest_start
* CVE-2020-11935
- aufs: do not call i_readcount_inc()
* ip_defrag.sh in net from ubuntu_kernel_selftests failed with 5.0 / 5.3 / 5.4
kernel (LP: #1826848)
- selftests: net: ip_defrag: ignore EPERM
* Update lockdown patches (LP: #1884159)
- SAUCE: acpi: disallow loading configfs acpi tables when locked down
* seccomp_bpf fails on powerpc (LP: #1885757)
- SAUCE: selftests/seccomp: fix ptrace tests on powerpc
* Introduce the new NVIDIA 418-server and 440-server series, and update the
current NVIDIA drivers (LP: #1881137)
- [packaging] add signed modules for the 418-server and the 440-server
flavours
-- Khalid Elmously <[email protected]> Thu, 09 Jul 2020
19:50:26 -0400
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.6 in Ubuntu.
https://bugs.launchpad.net/bugs/1881710
Title:
tpm: fix TIS locality timeout problems
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-5.6 package in Ubuntu:
Fix Released
Status in linux-oem-osp1 package in Ubuntu:
Invalid
Status in linux-oem-osp1 source package in Bionic:
Fix Released
Status in linux source package in Focal:
Fix Released
Status in linux-oem-5.6 source package in Focal:
Fix Released
Bug description:
[Impact]
It has been reported that some TIS based TPMs are giving unexpected errors
when using the O_NONBLOCK path of the TPM device. The problem is that some TPMs
don't like it when you get and then relinquish a locality (as the
tpm_try_get_ops()/tpm_put_ops() pair does) without sending a command. This
currently happens all the time in the O_NONBLOCK write path. This affects
Nuvoton TPMs and was a regression caused by the patch d23d12484307 ("tpm: fix
invalid locking in NONBLOCKING mode").
PatchLink: https://patchwork.kernel.org/patch/11576453/
[Fix]
Fix this by moving the tpm_try_get_ops()
further down the code to after the O_NONBLOCK determination is made.
This is safe because the priv->buffer_mutex still protects the priv
state being modified.
[Regression Risk]
Low. This patch only for fix the patch d23d12484307 ("tpm: fix invalid
locking in NONBLOCKING mode").
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