rcu: Provide optional RCU-reader exit delay for strict GPs

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The goal of this series is to increase the probability of tools like
KASAN detecting that an RCU-protected pointer was used outside of its
RCU read-side critical section.  Thus far, the approach has been to make
grace periods and callback processing happen faster.  Another approach
is to delay the pointer leaker.  This commit therefore allows a delay
to be applied to exit from RCU read-side critical sections.

This slowdown is specified by a new rcutree.rcu_unlock_delay kernel boot
parameter that specifies this delay in microseconds, defaulting to zero.

Reported-by Jann Horn <jannh@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Paul E. McKenney 2020-08-07 13:44:10 -07:00

parent 4e025f52a1

commit 3d29aaf1ef

2 changed files with 19 additions and 2 deletions

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9

Documentation/admin-guide/kernel-parameters.txt

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12

kernel/rcu/tree_plugin.h

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