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Here also, additional code is introduced, as s390 uses asm syscall tables, while in general case, wrappers may be used in C code. __SC_COMPAT_CAST for s390 is too specific due to 31-bit pointer length, so it's moved to arch/s390/include/asm/compat.h. Generic declaration assumes that long, unsigned long and pointer types are all 32-bit length. linux/syscalls_structs.h header is introduced, because from now (see next patch) structure types listed there are needed for both normal and compat mode. cond_syscall_wrapped now defined two symbols: sys_foo() and compat_sys_foo(), if compat wrappers are enabled. Here __SC_WRAP() macro is introduced as well. s390 doesn't need it as it uses asm-generated syscall table. But architectures that generate that tables with C code (ARM64/ILP32) should redefine it as '#define __SC_WRAP(name) compat_##name'. Signed-off-by: Yury Norov --- arch/s390/include/asm/compat.h | 17 +++++++++-- arch/s390/kernel/compat_wrapper.c | 51 --------------------------------- include/linux/compat.h | 52 +++++++++++++++++++++++++++++++++ include/linux/syscalls.h | 57 +------------------------------------ include/linux/syscalls_structs.h | 60 +++++++++++++++++++++++++++++++++++++++ include/uapi/asm-generic/unistd.h | 4 +++ 6 files changed, 132 insertions(+), 109 deletions(-) create mode 100644 include/linux/syscalls_structs.h diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h index 352f7bd..f412723 100644 --- a/arch/s390/include/asm/compat.h +++ b/arch/s390/include/asm/compat.h @@ -7,13 +7,26 @@ #include #include -#define __TYPE_IS_PTR(t) (!__builtin_types_compatible_p(typeof(0?(t)0:0ULL), u64)) - #define __SC_DELOUSE(t,v) ({ \ BUILD_BUG_ON(sizeof(t) > 4 && !__TYPE_IS_PTR(t)); \ (t)(__TYPE_IS_PTR(t) ? ((v) & 0x7fffffff) : (v)); \ }) +#define __SC_COMPAT_CAST(t, a) \ +({ \ + long __ReS = a; \ + \ + BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) && \ + !__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t)); \ + if (__TYPE_IS_L(t)) \ + __ReS = (s32)a; \ + if (__TYPE_IS_UL(t)) \ + __ReS = (u32)a; \ + if (__TYPE_IS_PTR(t)) \ + __ReS = a & 0x7fffffff; \ + (t)__ReS; \ +}) + #define PSW32_MASK_PER 0x40000000UL #define PSW32_MASK_DAT 0x04000000UL #define PSW32_MASK_IO 0x02000000UL diff --git a/arch/s390/kernel/compat_wrapper.c b/arch/s390/kernel/compat_wrapper.c index ae2cda5..1614e15 100644 --- a/arch/s390/kernel/compat_wrapper.c +++ b/arch/s390/kernel/compat_wrapper.c @@ -8,57 +8,6 @@ #include #include "entry.h" -#define COMPAT_SYSCALL_WRAP1(name, ...) \ - COMPAT_SYSCALL_WRAPx(1, _##name, __VA_ARGS__) -#define COMPAT_SYSCALL_WRAP2(name, ...) \ - COMPAT_SYSCALL_WRAPx(2, _##name, __VA_ARGS__) -#define COMPAT_SYSCALL_WRAP3(name, ...) \ - COMPAT_SYSCALL_WRAPx(3, _##name, __VA_ARGS__) -#define COMPAT_SYSCALL_WRAP4(name, ...) \ - COMPAT_SYSCALL_WRAPx(4, _##name, __VA_ARGS__) -#define COMPAT_SYSCALL_WRAP5(name, ...) \ - COMPAT_SYSCALL_WRAPx(5, _##name, __VA_ARGS__) -#define COMPAT_SYSCALL_WRAP6(name, ...) \ - COMPAT_SYSCALL_WRAPx(6, _##name, __VA_ARGS__) - -#define __SC_COMPAT_TYPE(t, a) \ - __typeof(__builtin_choose_expr(sizeof(t) > 4, 0L, (t)0)) a - -#define __SC_COMPAT_CAST(t, a) \ -({ \ - long __ReS = a; \ - \ - BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) && \ - !__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t)); \ - if (__TYPE_IS_L(t)) \ - __ReS = (s32)a; \ - if (__TYPE_IS_UL(t)) \ - __ReS = (u32)a; \ - if (__TYPE_IS_PTR(t)) \ - __ReS = a & 0x7fffffff; \ - (t)__ReS; \ -}) - -/* - * The COMPAT_SYSCALL_WRAP macro generates system call wrappers to be used by - * compat tasks. These wrappers will only be used for system calls where only - * the system call arguments need sign or zero extension or zeroing of the upper - * 33 bits of pointers. - * Note: since the wrapper function will afterwards call a system call which - * again performs zero and sign extension for all system call arguments with - * a size of less than eight bytes, these compat wrappers only touch those - * system call arguments with a size of eight bytes ((unsigned) long and - * pointers). Zero and sign extension for e.g. int parameters will be done by - * the regular system call wrappers. - */ -#define COMPAT_SYSCALL_WRAPx(x, name, ...) \ -asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \ -asmlinkage long notrace compat_sys##name(__MAP(x,__SC_COMPAT_TYPE,__VA_ARGS__));\ -asmlinkage long notrace compat_sys##name(__MAP(x,__SC_COMPAT_TYPE,__VA_ARGS__)) \ -{ \ - return sys##name(__MAP(x,__SC_COMPAT_CAST,__VA_ARGS__)); \ -} - COMPAT_SYSCALL_WRAP2(creat, const char __user *, pathname, umode_t, mode); COMPAT_SYSCALL_WRAP2(link, const char __user *, oldname, const char __user *, newname); COMPAT_SYSCALL_WRAP1(unlink, const char __user *, pathname); diff --git a/include/linux/compat.h b/include/linux/compat.h index f964ef7..4eba16e 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -30,6 +30,10 @@ #define __SC_DELOUSE(t,v) ((t)(unsigned long)(v)) #endif +#ifndef __TYPE_IS_PTR +#define __TYPE_IS_PTR(t) (!__builtin_types_compatible_p(typeof(0?(t)0:0ULL), u64)) +#endif + #define COMPAT_SYSCALL_DEFINE0(name) \ asmlinkage long compat_sys_##name(void) @@ -739,4 +743,52 @@ static inline bool in_compat_syscall(void) { return false; } #endif /* CONFIG_COMPAT */ +#ifdef CONFIG_COMPAT_WRAPPER + +#define COMPAT_SYSCALL_WRAP1(name, ...) COMPAT_SYSCALL_WRAPx(1, _##name, __VA_ARGS__) +#define COMPAT_SYSCALL_WRAP2(name, ...) COMPAT_SYSCALL_WRAPx(2, _##name, __VA_ARGS__) +#define COMPAT_SYSCALL_WRAP3(name, ...) COMPAT_SYSCALL_WRAPx(3, _##name, __VA_ARGS__) +#define COMPAT_SYSCALL_WRAP4(name, ...) COMPAT_SYSCALL_WRAPx(4, _##name, __VA_ARGS__) +#define COMPAT_SYSCALL_WRAP5(name, ...) COMPAT_SYSCALL_WRAPx(5, _##name, __VA_ARGS__) +#define COMPAT_SYSCALL_WRAP6(name, ...) COMPAT_SYSCALL_WRAPx(6, _##name, __VA_ARGS__) + +#ifndef __SC_COMPAT_TYPE +#define __SC_COMPAT_TYPE(t, a) \ + __typeof(__builtin_choose_expr(sizeof(t) > 4, 0L, (t)0)) a +#endif + +#ifndef __SC_COMPAT_CAST +#define __SC_COMPAT_CAST(t, a) ({ \ + BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) && \ + !__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t)); \ + ((t) ((t)(-1) < 0 ? (s64)(s32)(a) : (u64)(u32)(a))); \ +}) +#endif + +#ifndef COMPAT_SYSCALL_WRAPx +/* + * The COMPAT_SYSCALL_WRAP macro generates system call wrappers to be used by + * compat tasks. These wrappers will only be used for system calls where only + * the system call arguments need sign or zero extension or zeroing of the upper + * parts of arguments passed in register. + * Note: since the wrapper function will afterwards call a system call which + * again performs zero and sign extension for all system call arguments with + * a size of less than eight bytes, these compat wrappers only touch those + * system call arguments with a size of eight bytes ((unsigned) long and + * pointers). Zero and sign extension for e.g. int parameters will be done by + * the regular system call wrappers. + */ +#define COMPAT_SYSCALL_WRAPx(x, name, ...) \ +asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \ +asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \ + __attribute__((alias(__stringify(compat_SyS##name)))); \ +asmlinkage long notrace compat_SyS##name(__MAP(x,__SC_COMPAT_TYPE,__VA_ARGS__)); \ +asmlinkage long notrace compat_SyS##name(__MAP(x,__SC_COMPAT_TYPE,__VA_ARGS__)) \ +{ \ + return sys##name(__MAP(x,__SC_COMPAT_CAST,__VA_ARGS__)); \ +} +#endif + +#endif /* CONFIG_COMPAT_WRAPPER */ + #endif /* _LINUX_COMPAT_H */ diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index d795472..9d345eb 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -11,62 +11,7 @@ #ifndef _LINUX_SYSCALLS_H #define _LINUX_SYSCALLS_H -struct epoll_event; -struct iattr; -struct inode; -struct iocb; -struct io_event; -struct iovec; -struct itimerspec; -struct itimerval; -struct kexec_segment; -struct linux_dirent; -struct linux_dirent64; -struct list_head; -struct mmap_arg_struct; -struct msgbuf; -struct user_msghdr; -struct mmsghdr; -struct msqid_ds; -struct new_utsname; -struct nfsctl_arg; -struct __old_kernel_stat; -struct oldold_utsname; -struct old_utsname; -struct pollfd; -struct rlimit; -struct rlimit64; -struct rusage; -struct sched_param; -struct sched_attr; -struct sel_arg_struct; -struct semaphore; -struct sembuf; -struct shmid_ds; -struct sockaddr; -struct stat; -struct stat64; -struct statfs; -struct statfs64; -struct __sysctl_args; -struct sysinfo; -struct timespec; -struct timeval; -struct timex; -struct timezone; -struct tms; -struct utimbuf; -struct mq_attr; -struct compat_stat; -struct compat_timeval; -struct robust_list_head; -struct getcpu_cache; -struct old_linux_dirent; -struct perf_event_attr; -struct file_handle; -struct sigaltstack; -union bpf_attr; - +#include #include #include #include diff --git a/include/linux/syscalls_structs.h b/include/linux/syscalls_structs.h new file mode 100644 index 0000000..a920cbc --- /dev/null +++ b/include/linux/syscalls_structs.h @@ -0,0 +1,60 @@ +#ifndef _LINUX_SYSCALL_STRUCTS_H +#define _LINUX_SYSCALL_STRUCTS_H + +struct epoll_event; +struct iattr; +struct inode; +struct iocb; +struct io_event; +struct iovec; +struct itimerspec; +struct itimerval; +struct kexec_segment; +struct linux_dirent; +struct linux_dirent64; +struct list_head; +struct mmap_arg_struct; +struct msgbuf; +struct user_msghdr; +struct mmsghdr; +struct msqid_ds; +struct new_utsname; +struct nfsctl_arg; +struct __old_kernel_stat; +struct oldold_utsname; +struct old_utsname; +struct pollfd; +struct rlimit; +struct rlimit64; +struct rusage; +struct sched_param; +struct sched_attr; +struct sel_arg_struct; +struct semaphore; +struct sembuf; +struct shmid_ds; +struct sockaddr; +struct stat; +struct stat64; +struct statfs; +struct statfs64; +struct __sysctl_args; +struct sysinfo; +struct timespec; +struct timeval; +struct timex; +struct timezone; +struct tms; +struct utimbuf; +struct mq_attr; +struct compat_stat; +struct compat_timeval; +struct robust_list_head; +struct getcpu_cache; +struct old_linux_dirent; +struct perf_event_attr; +struct file_handle; +struct sigaltstack; +union bpf_attr; + +#endif /* _LINUX_SYSCALL_STRUCTS_H */ diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index c51afb7..7e91d83 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -29,6 +29,10 @@ #define __SC_COMP_3264(_nr, _32, _64, _comp) __SC_3264(_nr, _32, _64) #endif +#ifndef __SC_WRAP +#define __SC_WRAP __SYSCALL +#endif + #define __NR_io_setup 0 __SC_COMP(__NR_io_setup, sys_io_setup, compat_sys_io_setup) #define __NR_io_destroy 1