On 21/04/2021 16:18, Greg KH wrote:
> On Wed, Apr 21, 2021 at 04:05:32PM +0300, Zidenberg, Tsahi wrote:
>> In arm64, kernelspace address accessors cannot be used to access
>> userspace addresses, which means bpf_probe_read{,str}() cannot access
>> userspace addresses. That causes e.g. command-line parameters to not
>> appear when snooping execve using bpf.
>>
>> This patch series takes the upstream solution. This solution also
>> changes user API in the following ways:
>> * Add probe_read_{user, kernel}{,_str} bpf helpers
>> * Add skb_output helper to the enum only (calling it not supported)
>> * Add support for %pks, %pus specifiers
>>
>> An alternative fix only takes the required logic to existing API without
>> adding new API, was suggested here:
>> https://www.spinics.net/lists/stable/msg454945.html
>>
>> Another option is to only take patches [1-4] of this patchset, and add
>> on top of them commit 8d92db5c04d1 ("bpf: rework the compat kernel probe
>> handling"). In that case, the last patch would require function renames
>> and conflict resolutions that were avoided in this patchset by pulling
>> patches [5-7].
> What stable tree(s) are you expecting these to be relevant for?
Sorry I forgot to mention it here..
This patchset was created/tested for 5.4.
I expect it to also be relevant for 4.19, but I didn't test it.
If you like it for 5.4 I could test and resubmit or notify you.
No updates are necessary for 5.10.
Thank you!
Tsahi.
