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ANDROID: vendor_hooks: add hooks in prctl_set_vma

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In some special scenarios, some threads are allowed to skip waiting,
write the set_anon_name task into the queue and return directly, thus
improving the system's response speed and performance.

Bug: 349739224

Change-Id: Id3686309da108e242a30cfaf68f859b10215f402
Signed-off-by: Zhifeng Zhu <zhifeng.zhu@vivo.com>
This commit is contained in:
Zhifeng Zhu
2024-07-04 14:47:17 +08:00
committed by Treehugger Robot
parent 9197be6cf9
commit 19a7e0717d
3 changed files with 11 additions and 1 deletions
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2
drivers/android/vendor_hooks.c
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@@ -560,4 +560,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_resume_end);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_early_resume_begin);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_use_amu_fie);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_set_tsk_need_resched_lazy);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_pr_set_vma_name_bypass);

5
include/trace/hooks/sys.h
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@@ -14,6 +14,11 @@ DECLARE_HOOK(android_vh_syscall_prctl_finished,
DECLARE_HOOK(android_vh_security_audit_log_setid,
TP_PROTO(u32 type, u32 old_id, u32 new_id),
TP_ARGS(type, old_id, new_id));
DECLARE_RESTRICTED_HOOK(android_rvh_pr_set_vma_name_bypass,
TP_PROTO(struct mm_struct *mm, unsigned long addr, unsigned long size,
struct anon_vma_name *anon_name, int *error, bool *bypass),
TP_ARGS(mm, addr, size, anon_name, error, bypass), 1);
#endif
#include <trace/define_trace.h>

5
kernel/sys.c
View File

@@ -2358,6 +2358,7 @@ static int prctl_set_vma(unsigned long opt, unsigned long addr,
struct mm_struct *mm = current->mm;
const char __user *uname;
struct anon_vma_name *anon_name = NULL;
bool bypass = false;
int error;
switch (opt) {
@@ -2384,6 +2385,10 @@ static int prctl_set_vma(unsigned long opt, unsigned long addr,
}
trace_android_rvh_pr_set_vma_name_bypass(mm, addr, size, anon_name,
&error, &bypass);
if (bypass)
return error;
mmap_write_lock(mm);
error = madvise_set_anon_name(mm, addr, size, anon_name);
mmap_write_unlock(mm);