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syscall: replace lstat, lchown, stat to please Android O

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Implement Lstat with fstatat and Lchown with Fchownat on
linux/amd64, linux/arm and linux/386. Furthermore, implement Stat
with fstatat on linux/arm and linux/386. Linux/arm64 already had
similar replacements.

The fstatat and fchownat system calls were added in kernel 2.6.16,
which is before the Go minimum, 2.6.23.

The three syscalls then match the android bionic implementation
and avoids the Android O seccomp filter.

Fixes #27797

Change-Id: I07fd5506955d454a1a660fef5af0e1ac1ecb0959
Reviewed-on: https://go-review.googlesource.com/136795
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Elias Naur 2018-09-22 10:30:05 +02:00
parent 6054fef17f
commit f25656d392
6 changed files with 32 additions and 128 deletions
Download patch file Download diff file Expand all files Collapse all files

15
src/syscall/syscall_linux_386.go
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@ -62,8 +62,6 @@ func Pipe2(p []int, flags int) (err error) {
//sysnb InotifyInit() (fd int, err error)
//sys Ioperm(from int, num int, on int) (err error)
//sys Iopl(level int) (err error)
//sys Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32
//sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
//sys Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
//sys Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
//sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
@ -74,7 +72,6 @@ func Pipe2(p []int, flags int) (err error) {
//sysnb Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32
//sysnb Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32
//sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
//sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
//sys SyncFileRange(fd int, off int64, n int64, flags int) (err error)
//sys Truncate(path string, length int64) (err error) = SYS_TRUNCATE64
//sysnb getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32
@ -84,6 +81,18 @@ func Pipe2(p []int, flags int) (err error) {
//sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)
//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
func Stat(path string, stat *Stat_t) (err error) {
return fstatat(_AT_FDCWD, path, stat, 0)
}
func Lchown(path string, uid int, gid int) (err error) {
return Fchownat(_AT_FDCWD, path, uid, gid, _AT_SYMLINK_NOFOLLOW)
}
func Lstat(path string, stat *Stat_t) (err error) {
return fstatat(_AT_FDCWD, path, stat, _AT_SYMLINK_NOFOLLOW)
}
func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
page := uintptr(offset / 4096)
if offset != int64(page)*4096 {