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kernel: fix prebuilt get_cred_rcu on certain linux version

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Previously, i think non_rcu not available on 4.4.186 and below
but, apparently 4.9 too.

Fix: 33d2961b05

Signed-off-by: Rissu <90097027+rsuntk@users.noreply.github.com>
This commit is contained in:
Rissu
2025-03-25 13:41:48 +00:00
committed by ShirkNeko
parent 150ad66925
commit f28d4b9f39
2 changed files with 23 additions and 22 deletions
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7
kernel/Makefile
View File

@@ -80,12 +80,11 @@ endif
ifeq ($(shell grep -q "get_cred_rcu" $(srctree)/include/linux/cred.h; echo $$?),0)
ccflags-y += -DKSU_COMPAT_HAS_GET_CRED_RCU
else
# https://github.com/gregkh/linux/commit/123e44b9a49a42ff5313ec65256f1540d7c52fa0
ifeq ($(shell grep -q "atomic_long_t\s\+\usage" $(srctree)/include/linux/cred.h; echo $$?),0)
$(info -- KernelSU compat: atomic_long_t detected.)
ccflags-y += -DKSU_COMPAT_ATOMIC_LONG
else
$(info -- KernelSU compat: atomic_t detected.)
endif
ifeq ($(shell grep -q "int\s\+\non_rcu" $(srctree)/include/linux/cred.h; echo $$?),0)
ccflags-y += -DKSU_COMPAT_HAS_NONCONST_CRED
endif
endif

38
kernel/kernel_compat.h
View File

@@ -8,24 +8,26 @@
#include "linux/key.h"
// for kernel without get_cred_rcu
#ifndef KSU_COMPAT_HAS_GET_CRED_RCU
static inline const struct cred *get_cred_rcu(const struct cred *cred)
{
struct cred *nonconst_cred = (struct cred *) cred;
if (!cred)
return NULL;
#ifdef KSU_COMPAT_ATOMIC_LONG
if (!atomic_long_inc_not_zero(&nonconst_cred->usage))
#else
if (!atomic_inc_not_zero(&nonconst_cred->usage))
#endif
return NULL;
validate_creds(cred);
nonconst_cred->non_rcu = 0;
return cred;
}
#endif
#ifndef KSU_COMPAT_HAS_GET_CRED_RCU
static inline const struct cred *get_cred_rcu(const struct cred *cred)
{
struct cred *nonconst_cred = (struct cred *) cred;
if (!cred)
return NULL;
#ifdef KSU_COMPAT_ATOMIC_LONG
if (!atomic_long_inc_not_zero(&nonconst_cred->usage))
#else
if (!atomic_inc_not_zero(&nonconst_cred->usage))
#endif
return NULL;
validate_creds(cred);
#ifdef KSU_COMPAT_HAS_NONCONST_CRED
nonconst_cred->non_rcu = 0;
#endif
return cred;
}
#endif
/*
* Adapt to Huawei HISI kernel without affecting other kernels ,
* Huawei Hisi Kernel EBITMAP Enable or Disable Flag ,