| 62597edf | 17-Oct-2024 |
Michael Vetter <[email protected]> |
selftests: livepatch: test livepatching a kprobed function
The test proves that a function that is being kprobed and uses a
post_handler cannot be livepatched.
Only one ftrace_ops with FTRACE_OPS_F
selftests: livepatch: test livepatching a kprobed function
The test proves that a function that is being kprobed and uses a
post_handler cannot be livepatched.
Only one ftrace_ops with FTRACE_OPS_FL_IPMODIFY set may be registered
to any given function at a time.
Note that the conflicting kprobe could not be created using the
tracefs interface, see Documentation/trace/kprobetrace.rst.
This interface uses only the pre_handler(), see alloc_trace_kprobe().
But FTRACE_OPS_FL_IPMODIFY is used only when the kprobe is using a
post_handler, see arm_kprobe_ftrace().
Signed-off-by: Michael Vetter <[email protected]>
Reviewed-by: Miroslav Benes <[email protected]>
Reviewed-by: Joe Lawrence <[email protected]>
Tested-by: Marcos Paulo de Souza <[email protected]>
Reviewed-by: Marcos Paulo de Souza <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Tested-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Petr Mladek <[email protected]>
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| 54ee3526 | 21-Feb-2024 |
Marcos Paulo de Souza <[email protected]> |
selftests: livepatch: Avoid running the tests if kernel-devel is missing
By checking if KDIR is a valid directory we can safely skip the tests if
kernel-devel isn't installed (default value of KDIR)
selftests: livepatch: Avoid running the tests if kernel-devel is missing
By checking if KDIR is a valid directory we can safely skip the tests if
kernel-devel isn't installed (default value of KDIR), or if KDIR
variable passed doesn't exists.
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Marcos Paulo de Souza <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>
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| 6a717704 | 12-Jan-2024 |
Marcos Paulo de Souza <[email protected]> |
selftests: livepatch: Test livepatching a heavily called syscall
The test proves that a syscall can be livepatched. It is interesting
because syscalls are called a tricky way. Also the process gets
selftests: livepatch: Test livepatching a heavily called syscall
The test proves that a syscall can be livepatched. It is interesting
because syscalls are called a tricky way. Also the process gets
livepatched either when sleeping in the userspace or when entering
or leaving the kernel space.
The livepatch is a bit tricky:
1. The syscall function name is architecture specific. Also
ARCH_HAS_SYSCALL_WRAPPER must be taken in account.
2. The syscall must stay working the same way for other processes
on the system. It is solved by decrementing a counter only
for PIDs of the test processes. It means that the test processes
has to call the livepatched syscall at least once.
The test creates one userspace process per online cpu. The processes
are calling getpid in a busy loop. The intention is to create random
locations when the livepatch gets enabled. Nothing is guarantted.
The magic is in the randomness.
Reviewed-by: Joe Lawrence <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Marcos Paulo de Souza <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>
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| 5e4d4688 | 14-Jul-2020 |
Petr Mladek <[email protected]> |
selftests/livepatch: adopt to newer sysctl error format
With procfs v3.3.16, the sysctl command doesn't print the set key and
value on error. This change breaks livepatch selftest test-ftrace.sh,
t
selftests/livepatch: adopt to newer sysctl error format
With procfs v3.3.16, the sysctl command doesn't print the set key and
value on error. This change breaks livepatch selftest test-ftrace.sh,
that tests the interaction of sysctl ftrace_enabled:
Make it work with all sysctl versions using '-q' option.
Explicitly print the final status on success so that it can be verified
in the log. The error message is enough on failure.
Reported-by: Kamalesh Babulal <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Reviewed-by: Kamalesh Babulal <[email protected]>
Reviewed-by: Joe Lawrence <[email protected]>
Acked-by: Miroslav Benes <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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