Jiri Olsa d099f594ad kallsyms: Disable preemption for find_kallsyms_symbol_value ...

Artem reported suspicious RCU usage [1]. The reason is that verifier
calls find_kallsyms_symbol_value with preemption enabled which will
trigger suspicious RCU usage warning in rcu_dereference_sched call.

Disabling preemption in find_kallsyms_symbol_value and adding
__find_kallsyms_symbol_value function.

Fixes: 31bf1dbccfb0 ("bpf: Fix attaching fentry/fexit/fmod_ret/lsm to modules")
Reported-by: Artem Savkov <asavkov@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Artem Savkov <asavkov@redhat.com>
Reviewed-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/bpf/20230403220254.2191240-1-jolsa@kernel.org

[1] https://lore.kernel.org/bpf/ZBrPMkv8YVRiWwCR@samus.usersys.redhat.com/

2023-04-04 17:11:59 -07:00

..

debug_kmemleak.c

…

decompress.c

module/decompress: Support zstd in-kernel decompression

2022-12-07 12:05:05 -08:00

internal.h

kallsyms, bpf: Move find_kallsyms_symbol_value out of internal header

2023-03-17 13:45:51 +01:00

kallsyms.c

kallsyms: Disable preemption for find_kallsyms_symbol_value

2023-04-04 17:11:59 -07:00

Kconfig

module/decompress: Support zstd in-kernel decompression

2022-12-07 12:05:05 -08:00

kdb.c

…

livepatch.c

…

main.c

module: Use kstrtobool() instead of strtobool()

2023-01-25 14:07:21 -08:00

Makefile

…

procfs.c

module: Modify module_flags() to accept show_state argument

2022-07-14 17:40:23 -07:00

signing.c

module: Fix prefix for module.sig_enforce module param

2022-06-02 12:44:33 -07:00

strict_rwx.c

…

sysfs.c

module: remove redundant module_sysfs_initialized variable

2022-11-11 10:19:52 -08:00

tracking.c

module: tracking: Keep a record of tainted unloaded modules only

2022-10-10 12:16:19 -07:00

tree_lookup.c

…

version.c

Modules updates for v5.19-rc1

2022-05-26 17:13:43 -07:00