mariux: kernel 6.12.43.mx64.486 breaks pasta (and in turn also podman)

[thomas]

pasta is a user space network utility [a,b], that helps podman to manage network setups.

Running pasta on 6.12.43.mx64.486 yields:

  #> pasta -4
    lseek() failed on /proc/net file: Illegal seek
    lseek() failed on /proc/net file: Illegal seek
    some more ...
    lseek() failed on /proc/net file: Illegal seek
    ... and an overflowing log

Mind: enter [Ctrl]-[D] to leave the namespace.

With kernel 6.12.40.mx64.484 (and before) there are no problems.

Reason is described under "Bring back lseek() operations for /proc/net entries" [c].

Commit ff7ec8dc1b64 ("proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al")

Reason for the 'reason' above seems to be a security fix, that was maybe a bit incomplete/untested? [d]

Anyway, right now it is still possible to check and develop things with podman/pasta, but we should yank that kernel before it runs everywhere.

[a] #> pman pasta
[b] https://passt.top/passt/about/
[c] https://www.spinics.net/lists/kernel/msg5818804.html
[d] https://bugzilla.redhat.com/show_bug.cgi?id=2390372

[pmenzel]

@deinemuddah:~$ sudo mxgrub --set-default mariux-6.12.40-484
ln -sf bzImage-6.12.40.mx64.484 /boot/bzImage.x86_64
/boot/grub/grub.cfg: updated

[pmenzel]

Commit 2ce3d282bd50 (proc: fix missing pde_set_flags() for net proc files) is present since v6.17-rc5, and present in the 6.12.y LTS series since v6.12.46 (commit 3eebe856d09b6bdd8df99eb67203c831f23e21d7). I am going to build the current release 6.12.49.