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bd8434f4f4
Hi @tiann. Thanks for the great project, I had great fun playing around with it. This PR mainly tries to further minimize the possible delays caused by KernelSU hooking. There are 3 major changes: - Processes with 0 < UID < 2000 are blocked straight-up before going through the allow_list. I don't see any need for such processes to be interested in root, and this allows returning early before going through a more expensive lookup. If there's an expected breakage due to this change, I'll remove it. Let me know. - A page-sized (4K) bitmap is added. This allows O(1) lookup for UID <= 32767. This speeds up `ksu_is_allow_uid()` by about 4.8x by sacrificing a 4K memory. IMHO, a good trade-off. Most notably, this reduces the 99.999% result previously from worrying milliseconds scale to microseconds scale. For UID > 32767, another page-sized (4K) sequential array is used to cache allow_list. Compared to the previous PR #557, this new approach gives another nice 25% performance boost in average, 63-96% boost in worst cases. Benchmark results are available at https://docs.google.com/spreadsheets/d/1w_tO1zRLPNMFRer49pL1TQfL6ndEhilRrDU1XFIcWXY/edit?usp=sharing Thanks! --------- Signed-off-by: Juhyung Park <qkrwngud825@gmail.com>
39 lines
655 B
C
39 lines
655 B
C
#ifndef __KSU_H_KSU_MANAGER
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#define __KSU_H_KSU_MANAGER
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#include "linux/cred.h"
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#include "linux/types.h"
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#define KSU_INVALID_UID -1
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extern uid_t ksu_manager_uid; // DO NOT DIRECT USE
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static inline bool ksu_is_manager_uid_valid()
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{
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return ksu_manager_uid != KSU_INVALID_UID;
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}
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static inline bool is_manager()
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{
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return unlikely(ksu_manager_uid == current_uid().val);
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}
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static inline uid_t ksu_get_manager_uid()
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{
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return ksu_manager_uid;
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}
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static inline void ksu_set_manager_uid(uid_t uid)
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{
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ksu_manager_uid = uid;
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}
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static inline void ksu_invalidate_manager_uid()
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{
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ksu_manager_uid = KSU_INVALID_UID;
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}
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bool become_manager(char *pkg);
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#endif
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