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Merge pull request #1279 from joe-lawrence/syscalls 

macros: tweak syscall patching macros
This commit is contained in:
Joe Lawrence 2022-07-21 10:30:40 -04:00 committed by GitHub
parent dc7e5cb03d e921c557f9
commit dbde872cee
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 70 additions and 45 deletions
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105
kmod/patch/kpatch-syscall.h
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@ -38,6 +38,8 @@
#ifdef CONFIG_X86_64
/* x86/include/asm/syscall_wrapper.h versions */
# if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 7, 0)
# define __KPATCH_SYSCALL_DEFINEx(x, name, ...) \
@ -75,49 +77,12 @@
} \
static inline long __kpatch_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0) */
#define __KPATCH_SYSCALL_DEFINEx(x, name, ...) \
asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \
static inline long __kpatch_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
asmlinkage long SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
{ \
long ret = __kpatch_SYSC##name(__MAP(x,__SC_CAST,__VA_ARGS__));\
__MAP(x,__SC_TEST,__VA_ARGS__); \
__PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__)); \
return ret; \
} \
SYSCALL_ALIAS(sys##name, SyS##name); \
static inline long __kpatch_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
# endif /* LINUX_VERSION_CODE */
#elif defined(CONFIG_PPC64)
#define __KPATCH_SYSCALL_DEFINEx(x, name, ...) \
__diag_push(); \
__diag_ignore(GCC, 8, "-Wattribute-alias", \
"Type aliasing is used to sanitize syscall arguments");\
asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
__attribute__((alias(__stringify(__se_sys##name)))); \
ALLOW_ERROR_INJECTION(sys##name, ERRNO); \
static inline long __kpatch_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
asmlinkage long __attribute__((optimize("-fno-optimize-sibling-calls")))\
__se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
{ \
long ret = __kpatch_do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));\
__MAP(x,__SC_TEST,__VA_ARGS__); \
__PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__)); \
return ret; \
} \
__diag_pop(); \
static inline long __kpatch_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
#elif defined(CONFIG_S390)
/* s390/include/asm/syscall_wrapper.h versions */
#define __KPATCH_S390_SYS_STUBx(x, name, ...) \
long __s390_sys##name(struct pt_regs *regs); \
ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO); \
@ -149,7 +114,67 @@
__diag_pop(); \
static inline long __kpatch_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
#endif /* CONFIG_X86_64 */
#ifndef __KPATCH_SYSCALL_DEFINEx
/* include/linux/syscalls.h versions */
# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
# define __KPATCH_SYSCALL_DEFINEx(x, name, ...) \
__diag_push(); \
__diag_ignore(GCC, 8, "-Wattribute-alias", \
"Type aliasing is used to sanitize syscall arguments");\
asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
__attribute__((alias(__stringify(__se_sys##name)))); \
ALLOW_ERROR_INJECTION(sys##name, ERRNO); \
static inline long __kpatch_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
asmlinkage long __attribute__((optimize("-fno-optimize-sibling-calls")))\
__se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
{ \
long ret = __kpatch_do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));\
__MAP(x,__SC_TEST,__VA_ARGS__); \
__PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__)); \
return ret; \
} \
__diag_pop(); \
static inline long __kpatch_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
# elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
# define __KPATCH_SYSCALL_DEFINEx(x, name, ...) \
asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
__attribute__((alias(__stringify(__se_sys##name)))); \
ALLOW_ERROR_INJECTION(sys##name, ERRNO); \
static inline long __kpatch_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
{ \
long ret = __kpatch_do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));\
__MAP(x,__SC_TEST,__VA_ARGS__); \
__PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__)); \
return ret; \
} \
static inline long __kpatch_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
# else
# define __KPATCH_SYSCALL_DEFINEx(x, name, ...) \
asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
__attribute__((alias(__stringify(SyS##name)))); \
static inline long __kpatch_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \
asmlinkage long SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
asmlinkage long SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
{ \
long ret = __kpatch_SYSC##name(__MAP(x,__SC_CAST,__VA_ARGS__)); \
__MAP(x,__SC_TEST,__VA_ARGS__); \
__PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__)); \
return ret; \
} \
static inline long __kpatch_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
# endif
#endif /* __KPATCH_SYSCALL_DEFINEx */
#endif /* __KPATCH_SYSCALL_H_ */