1 files changed, 116 insertions, 19 deletions
diff --git a/arch/arm64/kernel/sys32.c b/arch/arm64/kernel/sys32.c
index a40b1343b819..0f8bcb7de700 100644
--- a/arch/arm64/kernel/sys32.c
+++ b/arch/arm64/kernel/sys32.c
@@ -22,31 +22,128 @@
  */
 #define __COMPAT_SYSCALL_NR
 
+#include <linux/compat.h>
 #include <linux/compiler.h>
 #include <linux/syscalls.h>
 
-asmlinkage long compat_sys_sigreturn_wrapper(void);
-asmlinkage long compat_sys_rt_sigreturn_wrapper(void);
-asmlinkage long compat_sys_statfs64_wrapper(void);
-asmlinkage long compat_sys_fstatfs64_wrapper(void);
-asmlinkage long compat_sys_pread64_wrapper(void);
-asmlinkage long compat_sys_pwrite64_wrapper(void);
-asmlinkage long compat_sys_truncate64_wrapper(void);
-asmlinkage long compat_sys_ftruncate64_wrapper(void);
-asmlinkage long compat_sys_readahead_wrapper(void);
-asmlinkage long compat_sys_fadvise64_64_wrapper(void);
-asmlinkage long compat_sys_sync_file_range2_wrapper(void);
-asmlinkage long compat_sys_fallocate_wrapper(void);
-asmlinkage long compat_sys_mmap2_wrapper(void);
+#include <asm/syscall.h>
 
-#undef __SYSCALL
-#define __SYSCALL(nr, sym)	[nr] = sym,
+asmlinkage long compat_sys_sigreturn(void);
+asmlinkage long compat_sys_rt_sigreturn(void);
+
+COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname,
+		       compat_size_t, sz, struct compat_statfs64 __user *, buf)
+{
+	/*
+	 * 32-bit ARM applies an OABI compatibility fixup to statfs64 and
+	 * fstatfs64 regardless of whether OABI is in use, and therefore
+	 * arbitrary binaries may rely upon it, so we must do the same.
+	 * For more details, see commit:
+	 *
+	 * 713c481519f19df9 ("[ARM] 3108/2: old ABI compat: statfs64 and
+	 * fstatfs64")
+	 */
+	if (sz == 88)
+		sz = 84;
+
+	return kcompat_sys_statfs64(pathname, sz, buf);
+}
+
+COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64, unsigned int, fd, compat_size_t, sz,
+		       struct compat_statfs64 __user *, buf)
+{
+	/* see aarch32_statfs64 */
+	if (sz == 88)
+		sz = 84;
+
+	return kcompat_sys_fstatfs64(fd, sz, buf);
+}
 
 /*
- * The sys_call_table array must be 4K aligned to be accessible from
- * kernel/entry.S.
+ * Note: off_4k is always in units of 4K. If we can't do the
+ * requested offset because it is not page-aligned, we return -EINVAL.
  */
-void * const compat_sys_call_table[__NR_compat_syscalls] __aligned(4096) = {
-	[0 ... __NR_compat_syscalls - 1] = sys_ni_syscall,
+COMPAT_SYSCALL_DEFINE6(aarch32_mmap2, unsigned long, addr, unsigned long, len,
+		       unsigned long, prot, unsigned long, flags,
+		       unsigned long, fd, unsigned long, off_4k)
+{
+	if (off_4k & (~PAGE_MASK >> 12))
+		return -EINVAL;
+
+	off_4k >>= (PAGE_SHIFT - 12);
+
+	return ksys_mmap_pgoff(addr, len, prot, flags, fd, off_4k);
+}
+
+#ifdef CONFIG_CPU_BIG_ENDIAN
+#define arg_u32p(name)	u32, name##_hi, u32, name##_lo
+#else
+#define arg_u32p(name)	u32, name##_lo, u32, name##_hi
+#endif
+
+#define arg_u64(name)	(((u64)name##_hi << 32) | name##_lo)
+
+COMPAT_SYSCALL_DEFINE6(aarch32_pread64, unsigned int, fd, char __user *, buf,
+		       size_t, count, u32, __pad, arg_u32p(pos))
+{
+	return ksys_pread64(fd, buf, count, arg_u64(pos));
+}
+
+COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64, unsigned int, fd,
+		       const char __user *, buf, size_t, count, u32, __pad,
+		       arg_u32p(pos))
+{
+	return ksys_pwrite64(fd, buf, count, arg_u64(pos));
+}
+
+COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname,
+		       u32, __pad, arg_u32p(length))
+{
+	return ksys_truncate(pathname, arg_u64(length));
+}
+
+COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad,
+		       arg_u32p(length))
+{
+	return ksys_ftruncate(fd, arg_u64(length));
+}
+
+COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad,
+		       arg_u32p(offset), size_t, count)
+{
+	return ksys_readahead(fd, arg_u64(offset), count);
+}
+
+COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64, int, fd, int, advice,
+		       arg_u32p(offset), arg_u32p(len))
+{
+	return ksys_fadvise64_64(fd, arg_u64(offset), arg_u64(len), advice);
+}
+
+COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2, int, fd, unsigned int, flags,
+		       arg_u32p(offset), arg_u32p(nbytes))
+{
+	return ksys_sync_file_range(fd, arg_u64(offset), arg_u64(nbytes),
+				    flags);
+}
+
+COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode,
+		       arg_u32p(offset), arg_u32p(len))
+{
+	return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len));
+}
+
+asmlinkage long sys_ni_syscall(const struct pt_regs *);
+#define __arm64_sys_ni_syscall	sys_ni_syscall
+
+#undef __SYSCALL
+#define __SYSCALL(nr, sym)	asmlinkage long __arm64_##sym(const struct pt_regs *);
+#include <asm/unistd32.h>
+
+#undef __SYSCALL
+#define __SYSCALL(nr, sym)	[nr] = (syscall_fn_t)__arm64_##sym,
+
+const syscall_fn_t compat_sys_call_table[__NR_compat_syscalls] = {
+	[0 ... __NR_compat_syscalls - 1] = (syscall_fn_t)sys_ni_syscall,
 #include <asm/unistd32.h>
 };