riscv: compat: syscall: Add compat_sys_call_table implementation

Implement compat sys_call_table and some system call functions:
truncate64, ftruncate64, fallocate, pread64, pwrite64,
sync_file_range, readahead, fadvise64_64 which need argument
translation.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220405071314.3225832-12-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Guo Ren 2022-04-05 15:13:05 +08:00 committed by Palmer Dabbelt
parent 01abdfeac8
commit 59c10c52f5
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
13 changed files with 148 additions and 3 deletions

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@ -16,6 +16,7 @@
/* The array of function pointers for syscalls. */
extern void * const sys_call_table[];
extern void * const compat_sys_call_table[];
/*
* Only the low 32 bits of orig_r0 are meaningful, so we return int.

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@ -11,6 +11,17 @@
#define __ARCH_WANT_SYS_CLONE
#define __ARCH_WANT_MEMFD_SECRET
#ifdef CONFIG_COMPAT
#define __ARCH_WANT_COMPAT_TRUNCATE64
#define __ARCH_WANT_COMPAT_FTRUNCATE64
#define __ARCH_WANT_COMPAT_FALLOCATE
#define __ARCH_WANT_COMPAT_PREAD64
#define __ARCH_WANT_COMPAT_PWRITE64
#define __ARCH_WANT_COMPAT_SYNC_FILE_RANGE
#define __ARCH_WANT_COMPAT_READAHEAD
#define __ARCH_WANT_COMPAT_FADVISE64_64
#endif
#include <uapi/asm/unistd.h>
#define NR_syscalls (__NR_syscalls)

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@ -15,7 +15,7 @@
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifdef __LP64__
#if defined(__LP64__) && !defined(__SYSCALL_COMPAT)
#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_SET_GET_RLIMIT
#endif /* __LP64__ */

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@ -69,3 +69,4 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
obj-$(CONFIG_EFI) += efi.o
obj-$(CONFIG_COMPAT) += compat_syscall_table.o

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@ -0,0 +1,19 @@
// SPDX-License-Identifier: GPL-2.0-only
#define __SYSCALL_COMPAT
#include <linux/compat.h>
#include <linux/syscalls.h>
#include <asm-generic/mman-common.h>
#include <asm-generic/syscalls.h>
#include <asm/syscall.h>
#undef __SYSCALL
#define __SYSCALL(nr, call) [nr] = (call),
asmlinkage long compat_sys_rt_sigreturn(void);
void * const compat_sys_call_table[__NR_syscalls] = {
[0 ... __NR_syscalls - 1] = sys_ni_syscall,
#include <asm/unistd.h>
};

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@ -33,7 +33,9 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
{
return riscv_sys_mmap(addr, len, prot, flags, fd, offset, 0);
}
#else
#endif
#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT)
SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
unsigned long, prot, unsigned long, flags,
unsigned long, fd, off_t, offset)
@ -44,7 +46,7 @@ SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
*/
return riscv_sys_mmap(addr, len, prot, flags, fd, offset, 12);
}
#endif /* !CONFIG_64BIT */
#endif
/*
* Allows the instruction cache to be flushed from userspace. Despite RISC-V

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@ -224,6 +224,21 @@ SYSCALL_DEFINE2(ftruncate64, unsigned int, fd, loff_t, length)
}
#endif /* BITS_PER_LONG == 32 */
#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_TRUNCATE64)
COMPAT_SYSCALL_DEFINE3(truncate64, const char __user *, pathname,
compat_arg_u64_dual(length))
{
return ksys_truncate(pathname, compat_arg_u64_glue(length));
}
#endif
#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_FTRUNCATE64)
COMPAT_SYSCALL_DEFINE3(ftruncate64, unsigned int, fd,
compat_arg_u64_dual(length))
{
return ksys_ftruncate(fd, compat_arg_u64_glue(length));
}
#endif
int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
{
@ -339,6 +354,15 @@ SYSCALL_DEFINE4(fallocate, int, fd, int, mode, loff_t, offset, loff_t, len)
return ksys_fallocate(fd, mode, offset, len);
}
#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_FALLOCATE)
COMPAT_SYSCALL_DEFINE6(fallocate, int, fd, int, mode, compat_arg_u64_dual(offset),
compat_arg_u64_dual(len))
{
return ksys_fallocate(fd, mode, compat_arg_u64_glue(offset),
compat_arg_u64_glue(len));
}
#endif
/*
* access() needs to use the real uid/gid, not the effective uid/gid.
* We do this by temporarily clearing all FS-related capabilities and

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@ -682,6 +682,14 @@ SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf,
return ksys_pread64(fd, buf, count, pos);
}
#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_PREAD64)
COMPAT_SYSCALL_DEFINE5(pread64, unsigned int, fd, char __user *, buf,
size_t, count, compat_arg_u64_dual(pos))
{
return ksys_pread64(fd, buf, count, compat_arg_u64_glue(pos));
}
#endif
ssize_t ksys_pwrite64(unsigned int fd, const char __user *buf,
size_t count, loff_t pos)
{
@ -708,6 +716,14 @@ SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf,
return ksys_pwrite64(fd, buf, count, pos);
}
#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_PWRITE64)
COMPAT_SYSCALL_DEFINE5(pwrite64, unsigned int, fd, const char __user *, buf,
size_t, count, compat_arg_u64_dual(pos))
{
return ksys_pwrite64(fd, buf, count, compat_arg_u64_glue(pos));
}
#endif
static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
loff_t *ppos, int type, rwf_t flags)
{

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@ -373,6 +373,15 @@ SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
return ksys_sync_file_range(fd, offset, nbytes, flags);
}
#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_SYNC_FILE_RANGE)
COMPAT_SYSCALL_DEFINE6(sync_file_range, int, fd, compat_arg_u64_dual(offset),
compat_arg_u64_dual(nbytes), unsigned int, flags)
{
return ksys_sync_file_range(fd, compat_arg_u64_glue(offset),
compat_arg_u64_glue(nbytes), flags);
}
#endif
/* It would be nice if people remember that not all the world's an i386
when they introduce new system calls */
SYSCALL_DEFINE4(sync_file_range2, int, fd, unsigned int, flags,

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@ -14,6 +14,13 @@
#define COMPAT_OFF_T_MAX 0x7fffffff
#endif
#if !defined(compat_arg_u64) && !defined(CONFIG_CPU_BIG_ENDIAN)
#define compat_arg_u64(name) u32 name##_lo, u32 name##_hi
#define compat_arg_u64_dual(name) u32, name##_lo, u32, name##_hi
#define compat_arg_u64_glue(name) (((u64)name##_lo & 0xffffffffUL) | \
((u64)name##_hi << 32))
#endif
/* These types are common across all compat ABIs */
typedef u32 compat_size_t;
typedef s32 compat_ssize_t;

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@ -926,6 +926,43 @@ asmlinkage long compat_sys_sigaction(int sig,
/* obsolete: net/socket.c */
asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
#ifdef __ARCH_WANT_COMPAT_TRUNCATE64
asmlinkage long compat_sys_truncate64(const char __user *pathname, compat_arg_u64(len));
#endif
#ifdef __ARCH_WANT_COMPAT_FTRUNCATE64
asmlinkage long compat_sys_ftruncate64(unsigned int fd, compat_arg_u64(len));
#endif
#ifdef __ARCH_WANT_COMPAT_FALLOCATE
asmlinkage long compat_sys_fallocate(int fd, int mode, compat_arg_u64(offset),
compat_arg_u64(len));
#endif
#ifdef __ARCH_WANT_COMPAT_PREAD64
asmlinkage long compat_sys_pread64(unsigned int fd, char __user *buf, size_t count,
compat_arg_u64(pos));
#endif
#ifdef __ARCH_WANT_COMPAT_PWRITE64
asmlinkage long compat_sys_pwrite64(unsigned int fd, const char __user *buf, size_t count,
compat_arg_u64(pos));
#endif
#ifdef __ARCH_WANT_COMPAT_SYNC_FILE_RANGE
asmlinkage long compat_sys_sync_file_range(int fd, compat_arg_u64(pos),
compat_arg_u64(nbytes), unsigned int flags);
#endif
#ifdef __ARCH_WANT_COMPAT_FADVISE64_64
asmlinkage long compat_sys_fadvise64_64(int fd, compat_arg_u64(pos),
compat_arg_u64(len), int advice);
#endif
#ifdef __ARCH_WANT_COMPAT_READAHEAD
asmlinkage long compat_sys_readahead(int fd, compat_arg_u64(offset), size_t count);
#endif
#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
/**

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@ -214,5 +214,16 @@ SYSCALL_DEFINE4(fadvise64, int, fd, loff_t, offset, size_t, len, int, advice)
return ksys_fadvise64_64(fd, offset, len, advice);
}
#endif
#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_FADVISE64_64)
COMPAT_SYSCALL_DEFINE6(fadvise64_64, int, fd, compat_arg_u64_dual(offset),
compat_arg_u64_dual(len), int, advice)
{
return ksys_fadvise64_64(fd, compat_arg_u64_glue(offset),
compat_arg_u64_glue(len), advice);
}
#endif
#endif

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@ -746,6 +746,13 @@ SYSCALL_DEFINE3(readahead, int, fd, loff_t, offset, size_t, count)
return ksys_readahead(fd, offset, count);
}
#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_READAHEAD)
COMPAT_SYSCALL_DEFINE4(readahead, int, fd, compat_arg_u64_dual(offset), size_t, count)
{
return ksys_readahead(fd, compat_arg_u64_glue(offset), count);
}
#endif
/**
* readahead_expand - Expand a readahead request
* @ractl: The request to be expanded