selftests/mm: Add new testcases for pkeys

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Add a few new tests to exercise the signal handler flow, especially with
PKEY 0 disabled:

 - Verify that the SIGSEGV handler is invoked when pkey 0 is disabled.

 - Verify that a thread which disables PKEY 0 segfaults with PKUERR when
   accessing the stack.

 - Verify that the SIGSEGV handler that uses an alternate signal stack is
   correctly invoked when the thread disabled PKEY 0

 - Verify that the PKRU value set by the application is correctly restored
   upon return from signal handling.

 - Verify that sigreturn() is able to restore the altstack even if the
   thread had PKEY 0 disabled

[ Aruna: Adapted to upstream ]
[ tglx: Made it actually compile. Restored protection_keys compile. Added
  	useful info to the changelog instead of bare function names. ]

Signed-off-by: Keith Lucas <keith.lucas@oracle.com>
Signed-off-by: Aruna Ramakrishna <aruna.ramakrishna@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20240802061318.2140081-6-aruna.ramakrishna@oracle.com

...

This commit is contained in:

Keith Lucas 2024-08-02 06:13:18 +00:00 • committed by Thomas Gleixner

parent d10b554919

commit 6998a73efb

4 changed files with 494 additions and 11 deletions

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1

tools/testing/selftests/mm/Makefile

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13

tools/testing/selftests/mm/pkey-helpers.h

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481

tools/testing/selftests/mm/pkey_sighandler_tests.c

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10

tools/testing/selftests/mm/protection_keys.c

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