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Dmitry Safonov
eeec26d5da
Michael noticed that userns limit for number of time namespaces is missing.
Furthermore, time namespace introduced UCOUNT_TIME_NAMESPACES, but didn't
introduce an array member in user_table[]. It would make array's
initialisation OOB write, but by luck the user_table array has an excessive
empty member (all accesses to the array are limited with UCOUNT_COUNTS - so
it silently reuses the last free member.
Fixes user-visible regression: max_inotify_instances by reason of the
missing UCOUNT_ENTRY() has limited max number of namespaces instead of the
number of inotify instances.
Fixes: 769071ac9f ("ns: Introduce Time Namespace")
Reported-by: Michael Kerrisk (man-pages) <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Andrei Vagin <[email protected]>
Acked-by: Vincenzo Frascino <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]