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crosvm/seccomp/aarch64/fs_device.policy

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seccomp: Add initial arm64 seccomp filters BUG=chromium:1029666 TEST=tast run crostini.LaunchTerminal.download_buster Change-Id: I8fa7dc9df4d5f0144aed80fcd60307036fc7e16d Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1946765 Reviewed-by: Stephen Barber <smbarber@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Tested-by: Stephen Barber <smbarber@chromium.org> Commit-Queue: Stephen Barber <smbarber@chromium.org>
2019-12-02 18:28:28 +00:00
# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
@include /usr/share/policy/crosvm/common_device.policy
devices: fs: Implement copy_file_range BUG=none TEST=vm.Virtiofs Change-Id: I2ed7137a901e6e506e6b1562b77fdb042bdc58ab Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2105822 Tested-by: Chirantan Ekbote <chirantan@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
2020-03-17 09:20:10 +00:00
copy_file_range: 1
seccomp: Add missing syscalls to fs device policy BUG=none TEST=`tast run <dut> vm.Fio.virtiofs` Change-Id: I937df0be738e0aa302a4ad3e87ed33ff97afb4fc Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2089174 Tested-by: Chirantan Ekbote <chirantan@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Auto-Submit: Chirantan Ekbote <chirantan@chromium.org> Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
2020-03-05 06:29:41 +00:00
fallocate: 1
devices: fs: Use 2 stage create and mkdir When creating a file or directory the virtio-fs server changes its effective uid and gid to the uid and gid of the process that made the call. This ensures that the file or directory has the correct owner and group when it is created and also serves as an access check to ensure that the process that made the call has permission to modify the parent directory. However, this causes an EACCES error when the following conditions are met: * The parent directory has g+rw permissions with gid A * The process has gid B but has A in its list of supplementary groups In this case the fuse context only contains gid B, which doesn't have permission to modify the parent directory. Unfortunately there's no way for us to detect this on the server side so instead we just have to rely on the permission checks carried out by the kernel driver. If the server receives a create call, then assume that the kernel has verified that the process is allowed to create that file/directory and just create it without changing the server thread's uid and gid. Additionally, in order to ensure that a newly created file appears atomically in the parent directory with the proper owner and group, change the create implementation to use `O_TMPFILE` and `linkat` as described in the open(2) manpage. There is no `O_TMPFILE` equivalent for directories so create a "hidden" directory with a randomly generated name, modify the uid/gid and mode, and then rename it into place. BUG=b:156696212 TEST=tast run $DUT vm.Virtiofs TEST=Create a test directory with group wayland and permissions g+rw. Then run `su -s /bin/bash -c 'touch ${dir}/foo' - crosvm` and `su -s /bin/bash -c 'mkdir ${dir}/bar' - crosvm`. Change-Id: If5fbcb1b011664c7c1ac29542a2f90d129c34962 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2217534 Reviewed-by: Chirantan Ekbote <chirantan@chromium.org> Commit-Queue: Chirantan Ekbote <chirantan@chromium.org> Tested-by: Chirantan Ekbote <chirantan@chromium.org>
2020-05-27 08:18:07 +00:00
fchmod: 1
seccomp: Add initial arm64 seccomp filters BUG=chromium:1029666 TEST=tast run crostini.LaunchTerminal.download_buster Change-Id: I8fa7dc9df4d5f0144aed80fcd60307036fc7e16d Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1946765 Reviewed-by: Stephen Barber <smbarber@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Tested-by: Stephen Barber <smbarber@chromium.org> Commit-Queue: Stephen Barber <smbarber@chromium.org>
2019-12-02 18:28:28 +00:00
fchmodat: 1
devices: fs: Use 2 stage create and mkdir When creating a file or directory the virtio-fs server changes its effective uid and gid to the uid and gid of the process that made the call. This ensures that the file or directory has the correct owner and group when it is created and also serves as an access check to ensure that the process that made the call has permission to modify the parent directory. However, this causes an EACCES error when the following conditions are met: * The parent directory has g+rw permissions with gid A * The process has gid B but has A in its list of supplementary groups In this case the fuse context only contains gid B, which doesn't have permission to modify the parent directory. Unfortunately there's no way for us to detect this on the server side so instead we just have to rely on the permission checks carried out by the kernel driver. If the server receives a create call, then assume that the kernel has verified that the process is allowed to create that file/directory and just create it without changing the server thread's uid and gid. Additionally, in order to ensure that a newly created file appears atomically in the parent directory with the proper owner and group, change the create implementation to use `O_TMPFILE` and `linkat` as described in the open(2) manpage. There is no `O_TMPFILE` equivalent for directories so create a "hidden" directory with a randomly generated name, modify the uid/gid and mode, and then rename it into place. BUG=b:156696212 TEST=tast run $DUT vm.Virtiofs TEST=Create a test directory with group wayland and permissions g+rw. Then run `su -s /bin/bash -c 'touch ${dir}/foo' - crosvm` and `su -s /bin/bash -c 'mkdir ${dir}/bar' - crosvm`. Change-Id: If5fbcb1b011664c7c1ac29542a2f90d129c34962 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2217534 Reviewed-by: Chirantan Ekbote <chirantan@chromium.org> Commit-Queue: Chirantan Ekbote <chirantan@chromium.org> Tested-by: Chirantan Ekbote <chirantan@chromium.org>
2020-05-27 08:18:07 +00:00
fchown: 1
seccomp: Add initial arm64 seccomp filters BUG=chromium:1029666 TEST=tast run crostini.LaunchTerminal.download_buster Change-Id: I8fa7dc9df4d5f0144aed80fcd60307036fc7e16d Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1946765 Reviewed-by: Stephen Barber <smbarber@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Tested-by: Stephen Barber <smbarber@chromium.org> Commit-Queue: Stephen Barber <smbarber@chromium.org>
2019-12-02 18:28:28 +00:00
fchownat: 1
seccomp: Add missing syscalls to fs device policy BUG=none TEST=`tast run <dut> vm.Fio.virtiofs` Change-Id: I937df0be738e0aa302a4ad3e87ed33ff97afb4fc Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2089174 Tested-by: Chirantan Ekbote <chirantan@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Auto-Submit: Chirantan Ekbote <chirantan@chromium.org> Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
2020-03-05 06:29:41 +00:00
fdatasync: 1
devices: fs: Use l{get,set,list,remove}xattr Using the `open_inode` method on an fd for a symlink results in the kernel returning -ELOOP. Since there are no `*at` methods for extended attributes, manually read the path for the file and then use the l{get,set,list,remove}xattr method on the returned path. BUG=b:136128512 TEST=boot arcvm with virtio-fs and selinux enabled Change-Id: I2fde57db8a075838a3a877309f6cf89059f19258 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2120763 Auto-Submit: Chirantan Ekbote <chirantan@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Commit-Queue: Stephen Barber <smbarber@chromium.org> Reviewed-by: Stephen Barber <smbarber@chromium.org>
2020-03-26 07:20:40 +00:00
lgetxattr: 1
lsetxattr: 1
llistxattr: 1
lremovexattr: 1
seccomp: Add missing syscalls to fs device policy BUG=none TEST=`tast run <dut> vm.Fio.virtiofs` Change-Id: I937df0be738e0aa302a4ad3e87ed33ff97afb4fc Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2089174 Tested-by: Chirantan Ekbote <chirantan@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Auto-Submit: Chirantan Ekbote <chirantan@chromium.org> Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
2020-03-05 06:29:41 +00:00
fsync: 1
seccomp: Add initial arm64 seccomp filters BUG=chromium:1029666 TEST=tast run crostini.LaunchTerminal.download_buster Change-Id: I8fa7dc9df4d5f0144aed80fcd60307036fc7e16d Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1946765 Reviewed-by: Stephen Barber <smbarber@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Tested-by: Stephen Barber <smbarber@chromium.org> Commit-Queue: Stephen Barber <smbarber@chromium.org>
2019-12-02 18:28:28 +00:00
newfstatat: 1
fstatfs: 1
ftruncate: 1
getdents64: 1
getegid: 1
geteuid: 1
devices: fs: Fix posix acl handling Posix acls are a truly incredible example of API design. The presence of a default posix acl in a directory completely changes the meaning of the `mode` parameter for all system call that create inodes. However, this new behavior only applies when the inode is first created and not for any subsequent operations that use the mode, like fchmod. When a directory has a default posix acl, all inodes created in that directory get the permissions specified in the default acl. The mode parameter is treated like a umask where any permissions allowed by the default acl that are not allowed by the mode parameter are blocked. The actual umask is ignored in this case. So to handle this properly we need to set FUSE_DONT_MASK to prevent the kernel driver from preemptively applying the umask. Then we have to check if the parent directory has a default posix acl and only apply the umask to the mode if it does not. This also means that we cannot use `mkdtemp` because that always creates directories with a mode of 0o700 and since the default posix acl calculation only applies on creation and not on later operations, we need to apply the proper mode in the very beginning. BUG=b:159285544,b:152806644 TEST=vm.Virtiofs. Use a test program to create files/directories in directories that have a default acl and ones that don't, and verify that the mode is correctly set after creation Change-Id: Ieca8ac9db391feebe5719630c5f3b57b04b71533 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2260253 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Commit-Queue: Chirantan Ekbote <chirantan@chromium.org> Auto-Submit: Chirantan Ekbote <chirantan@chromium.org>
2020-06-23 08:12:03 +00:00
getrandom: 1
devices: fs: Implement FS_IOC_FSSETXATTR Needed by arcvm. BUG=b:159297591 TEST=run a test program that calls the ioctl Change-Id: I1f8c17fa2b2457f5a9e73045c3dbee3440eb943d Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2265932 Auto-Submit: Chirantan Ekbote <chirantan@chromium.org> Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Tested-by: Chirantan Ekbote <chirantan@chromium.org> Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
2020-06-25 05:00:42 +00:00
ioctl: arg1 == FS_IOC_GET_ENCRYPTION_POLICY || arg1 == FS_IOC_SET_ENCRYPTION_POLICY || arg1 == FS_IOC_FSGETXATTR || arg1 == FS_IOC_FSSETXATTR
seccomp: Add initial arm64 seccomp filters BUG=chromium:1029666 TEST=tast run crostini.LaunchTerminal.download_buster Change-Id: I8fa7dc9df4d5f0144aed80fcd60307036fc7e16d Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1946765 Reviewed-by: Stephen Barber <smbarber@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Tested-by: Stephen Barber <smbarber@chromium.org> Commit-Queue: Stephen Barber <smbarber@chromium.org>
2019-12-02 18:28:28 +00:00
linkat: 1
lseek: 1
mkdirat: 1
mknodat: 1
seccomp: remove redundant unconditional arm/arm64 rules Minijail's policy compiler complains when there's multiple unconditional rules for a syscall. In most cases the rules are redundant to common_device.policy. BUG=None TEST=Ran compile_seccomp_policy.py until it stopped complaining. Change-Id: Ic43d1fd13f9c012641d71e526942229eb8b08ed4 Signed-off-by: Matt Delco <delco@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2034024 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Dylan Reid <dgreid@chromium.org>
2020-02-01 01:29:45 +00:00
openat: 1
seccomp: Add initial arm64 seccomp filters BUG=chromium:1029666 TEST=tast run crostini.LaunchTerminal.download_buster Change-Id: I8fa7dc9df4d5f0144aed80fcd60307036fc7e16d Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1946765 Reviewed-by: Stephen Barber <smbarber@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Tested-by: Stephen Barber <smbarber@chromium.org> Commit-Queue: Stephen Barber <smbarber@chromium.org>
2019-12-02 18:28:28 +00:00
preadv: 1
pwritev: 1
readlinkat: 1
renameat2: 1
setresgid: 1
setresuid: 1
symlinkat: 1
umask: 1
unlinkat: 1
utimensat: 1
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