sys/linux: /dev/snapshot descriptions (#1934)

18 files changed, 193 insertions, 14 deletions

diff --git a/sys/linux/dev_snapshot.txt b/sys/linux/dev_snapshot.txt
new file mode 100644
index 000000000..62af2803e
--- /dev/null
+++ b/sys/linux/dev_snapshot.txt
@@ -0,0 +1,33 @@
+# Copyright 2020 syzkaller project authors. All rights reserved.
+# Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+include <uapi/linux/suspend_ioctls.h>
+include <linux/ioctl.h>
+include <linux/fcntl.h>
+
+resource fd_snapshot[fd]
+
+openat$snapshot(fd const[AT_FDCWD], file ptr[in, string["/dev/snapshot"]], flags flags[open_flags], mode const[0]) fd_snapshot
+write$snapshot(fd fd_snapshot, buffer ptr[in, array[int8]], len bytesize[buffer])
+read$snapshot(fd fd_snapshot, buffer ptr[out, array[int8]], len bytesize[buffer])
+
+# SNAPSHOT_FREEZE is disabled because it can easily kill the machine.
+ioctl$SNAPHOT_FREEZE(fd fd_snapshot, cmd const[SNAPSHOT_FREEZE]) (disabled)
+ioctl$SNAPSHOT_UNFREEZE(fd fd_snapshot, cmd const[SNAPSHOT_UNFREEZE])
+ioctl$SNAPSHOT_CREATE_IMAGE(fd fd_snapshot, cmd const[SNAPSHOT_CREATE_IMAGE], arg ptr[out, int32])
+ioctl$SNAPSHOT_ATOMIC_RESTORE(fd fd_snapshot, cmd const[SNAPSHOT_ATOMIC_RESTORE])
+ioctl$SNAPSHOT_FREE(fd fd_snapshot, cmd const[SNAPSHOT_FREE])
+ioctl$SNAPSHOT_PREF_IMAGE_SIZE(fd fd_snapshot, cmd const[SNAPSHOT_PREF_IMAGE_SIZE], arg intptr)
+ioctl$SNAPSHOT_GET_IMAGE_SIZE(fd fd_snapshot, cmd const[SNAPSHOT_GET_IMAGE_SIZE], arg ptr[out, int64])
+ioctl$SNAPSHOT_AVAIL_SWAP_SIZE(fd fd_snapshot, cmd const[SNAPSHOT_AVAIL_SWAP_SIZE], arg ptr[out, int64])
+ioctl$SNAPSHOT_ALLOC_SWAP_PAGE(fd fd_snapshot, cmd const[SNAPSHOT_ALLOC_SWAP_PAGE], arg ptr[out, int64])
+ioctl$SNAPSHOT_FREE_SWAP_PAGES(fd fd_snapshot, cmd const[SNAPSHOT_FREE_SWAP_PAGES])
+ioctl$SNAPSHOT_S2RAM(fd fd_snapshot, cmd const[SNAPSHOT_S2RAM])
+ioctl$SNAPSHOT_PLATFORM_SUPPORT(fd fd_snapshot, cmd const[SNAPSHOT_PLATFORM_SUPPORT], arg intptr)
+ioctl$SNAPSHOT_POWER_OFF(fd fd_snapshot, cmd const[SNAPSHOT_POWER_OFF])
+ioctl$SNAPSHOT_SET_SWAP_AREA(fd fd_snapshot, cmd const[SNAPSHOT_SET_SWAP_AREA], arg ptr[in, resume_swap_area])
+
+resume_swap_area {
+	offset	int64
+	dev	int32
+}
diff --git a/sys/linux/dev_snapshot_386.const b/sys/linux/dev_snapshot_386.const
new file mode 100644
index 000000000..54bac5303
--- /dev/null
+++ b/sys/linux/dev_snapshot_386.const
@@ -0,0 +1,20 @@
+# AUTOGENERATED FILE
+AT_FDCWD = 18446744073709551516
+SNAPSHOT_ALLOC_SWAP_PAGE = 2148021012
+SNAPSHOT_ATOMIC_RESTORE = 13060
+SNAPSHOT_AVAIL_SWAP_SIZE = 2148021011
+SNAPSHOT_CREATE_IMAGE = 1074017041
+SNAPSHOT_FREE = 13061
+SNAPSHOT_FREEZE = 13057
+SNAPSHOT_FREE_SWAP_PAGES = 13065
+SNAPSHOT_GET_IMAGE_SIZE = 2148021006
+SNAPSHOT_PLATFORM_SUPPORT = 13071
+SNAPSHOT_POWER_OFF = 13072
+SNAPSHOT_PREF_IMAGE_SIZE = 13074
+SNAPSHOT_S2RAM = 13067
+SNAPSHOT_SET_SWAP_AREA = 1074541325
+SNAPSHOT_UNFREEZE = 13058
+__NR_ioctl = 54
+__NR_openat = 295
+__NR_read = 3
+__NR_write = 4
diff --git a/sys/linux/dev_snapshot_amd64.const b/sys/linux/dev_snapshot_amd64.const
new file mode 100644
index 000000000..bbf850a44
--- /dev/null
+++ b/sys/linux/dev_snapshot_amd64.const
@@ -0,0 +1,20 @@
+# AUTOGENERATED FILE
+AT_FDCWD = 18446744073709551516
+SNAPSHOT_ALLOC_SWAP_PAGE = 2148021012
+SNAPSHOT_ATOMIC_RESTORE = 13060
+SNAPSHOT_AVAIL_SWAP_SIZE = 2148021011
+SNAPSHOT_CREATE_IMAGE = 1074017041
+SNAPSHOT_FREE = 13061
+SNAPSHOT_FREEZE = 13057
+SNAPSHOT_FREE_SWAP_PAGES = 13065
+SNAPSHOT_GET_IMAGE_SIZE = 2148021006
+SNAPSHOT_PLATFORM_SUPPORT = 13071
+SNAPSHOT_POWER_OFF = 13072
+SNAPSHOT_PREF_IMAGE_SIZE = 13074
+SNAPSHOT_S2RAM = 13067
+SNAPSHOT_SET_SWAP_AREA = 1074541325
+SNAPSHOT_UNFREEZE = 13058
+__NR_ioctl = 16
+__NR_openat = 257
+__NR_read = 0
+__NR_write = 1
diff --git a/sys/linux/dev_snapshot_arm.const b/sys/linux/dev_snapshot_arm.const
new file mode 100644
index 000000000..4e2ea3ceb
--- /dev/null
+++ b/sys/linux/dev_snapshot_arm.const
@@ -0,0 +1,20 @@
+# AUTOGENERATED FILE
+AT_FDCWD = 18446744073709551516
+SNAPSHOT_ALLOC_SWAP_PAGE = 2148021012
+SNAPSHOT_ATOMIC_RESTORE = 13060
+SNAPSHOT_AVAIL_SWAP_SIZE = 2148021011
+SNAPSHOT_CREATE_IMAGE = 1074017041
+SNAPSHOT_FREE = 13061
+SNAPSHOT_FREEZE = 13057
+SNAPSHOT_FREE_SWAP_PAGES = 13065
+SNAPSHOT_GET_IMAGE_SIZE = 2148021006
+SNAPSHOT_PLATFORM_SUPPORT = 13071
+SNAPSHOT_POWER_OFF = 13072
+SNAPSHOT_PREF_IMAGE_SIZE = 13074
+SNAPSHOT_S2RAM = 13067
+SNAPSHOT_SET_SWAP_AREA = 1074541325
+SNAPSHOT_UNFREEZE = 13058
+__NR_ioctl = 54
+__NR_openat = 322
+__NR_read = 3
+__NR_write = 4
diff --git a/sys/linux/dev_snapshot_arm64.const b/sys/linux/dev_snapshot_arm64.const
new file mode 100644
index 000000000..564213248
--- /dev/null
+++ b/sys/linux/dev_snapshot_arm64.const
@@ -0,0 +1,20 @@
+# AUTOGENERATED FILE
+AT_FDCWD = 18446744073709551516
+SNAPSHOT_ALLOC_SWAP_PAGE = 2148021012
+SNAPSHOT_ATOMIC_RESTORE = 13060
+SNAPSHOT_AVAIL_SWAP_SIZE = 2148021011
+SNAPSHOT_CREATE_IMAGE = 1074017041
+SNAPSHOT_FREE = 13061
+SNAPSHOT_FREEZE = 13057
+SNAPSHOT_FREE_SWAP_PAGES = 13065
+SNAPSHOT_GET_IMAGE_SIZE = 2148021006
+SNAPSHOT_PLATFORM_SUPPORT = 13071
+SNAPSHOT_POWER_OFF = 13072
+SNAPSHOT_PREF_IMAGE_SIZE = 13074
+SNAPSHOT_S2RAM = 13067
+SNAPSHOT_SET_SWAP_AREA = 1074541325
+SNAPSHOT_UNFREEZE = 13058
+__NR_ioctl = 29
+__NR_openat = 56
+__NR_read = 63
+__NR_write = 64
diff --git a/sys/linux/dev_snapshot_mips64le.const b/sys/linux/dev_snapshot_mips64le.const
new file mode 100644
index 000000000..dba5619e3
--- /dev/null
+++ b/sys/linux/dev_snapshot_mips64le.const
@@ -0,0 +1,20 @@
+# AUTOGENERATED FILE
+AT_FDCWD = 18446744073709551516
+SNAPSHOT_ALLOC_SWAP_PAGE = 1074279188
+SNAPSHOT_ATOMIC_RESTORE = 536883972
+SNAPSHOT_AVAIL_SWAP_SIZE = 1074279187
+SNAPSHOT_CREATE_IMAGE = 2147758865
+SNAPSHOT_FREE = 536883973
+SNAPSHOT_FREEZE = 536883969
+SNAPSHOT_FREE_SWAP_PAGES = 536883977
+SNAPSHOT_GET_IMAGE_SIZE = 1074279182
+SNAPSHOT_PLATFORM_SUPPORT = 536883983
+SNAPSHOT_POWER_OFF = 536883984
+SNAPSHOT_PREF_IMAGE_SIZE = 536883986
+SNAPSHOT_S2RAM = 536883979
+SNAPSHOT_SET_SWAP_AREA = 2148283149
+SNAPSHOT_UNFREEZE = 536883970
+__NR_ioctl = 5015
+__NR_openat = 5247
+__NR_read = 5000
+__NR_write = 5001
diff --git a/sys/linux/dev_snapshot_ppc64le.const b/sys/linux/dev_snapshot_ppc64le.const
new file mode 100644
index 000000000..39a4351e6
--- /dev/null
+++ b/sys/linux/dev_snapshot_ppc64le.const
@@ -0,0 +1,20 @@
+# AUTOGENERATED FILE
+AT_FDCWD = 18446744073709551516
+SNAPSHOT_ALLOC_SWAP_PAGE = 1074279188
+SNAPSHOT_ATOMIC_RESTORE = 536883972
+SNAPSHOT_AVAIL_SWAP_SIZE = 1074279187
+SNAPSHOT_CREATE_IMAGE = 2147758865
+SNAPSHOT_FREE = 536883973
+SNAPSHOT_FREEZE = 536883969
+SNAPSHOT_FREE_SWAP_PAGES = 536883977
+SNAPSHOT_GET_IMAGE_SIZE = 1074279182
+SNAPSHOT_PLATFORM_SUPPORT = 536883983
+SNAPSHOT_POWER_OFF = 536883984
+SNAPSHOT_PREF_IMAGE_SIZE = 536883986
+SNAPSHOT_S2RAM = 536883979
+SNAPSHOT_SET_SWAP_AREA = 2148283149
+SNAPSHOT_UNFREEZE = 536883970
+__NR_ioctl = 54
+__NR_openat = 286
+__NR_read = 3
+__NR_write = 4
diff --git a/sys/linux/dev_snapshot_riscv64.const b/sys/linux/dev_snapshot_riscv64.const
new file mode 100644
index 000000000..564213248
--- /dev/null
+++ b/sys/linux/dev_snapshot_riscv64.const
@@ -0,0 +1,20 @@
+# AUTOGENERATED FILE
+AT_FDCWD = 18446744073709551516
+SNAPSHOT_ALLOC_SWAP_PAGE = 2148021012
+SNAPSHOT_ATOMIC_RESTORE = 13060
+SNAPSHOT_AVAIL_SWAP_SIZE = 2148021011
+SNAPSHOT_CREATE_IMAGE = 1074017041
+SNAPSHOT_FREE = 13061
+SNAPSHOT_FREEZE = 13057
+SNAPSHOT_FREE_SWAP_PAGES = 13065
+SNAPSHOT_GET_IMAGE_SIZE = 2148021006
+SNAPSHOT_PLATFORM_SUPPORT = 13071
+SNAPSHOT_POWER_OFF = 13072
+SNAPSHOT_PREF_IMAGE_SIZE = 13074
+SNAPSHOT_S2RAM = 13067
+SNAPSHOT_SET_SWAP_AREA = 1074541325
+SNAPSHOT_UNFREEZE = 13058
+__NR_ioctl = 29
+__NR_openat = 56
+__NR_read = 63
+__NR_write = 64
diff --git a/sys/linux/dev_snapshot_s390x.const b/sys/linux/dev_snapshot_s390x.const
new file mode 100644
index 000000000..b80c6eff8
--- /dev/null
+++ b/sys/linux/dev_snapshot_s390x.const
@@ -0,0 +1,20 @@
+# AUTOGENERATED FILE
+AT_FDCWD = 18446744073709551516
+SNAPSHOT_ALLOC_SWAP_PAGE = 2148021012
+SNAPSHOT_ATOMIC_RESTORE = 13060
+SNAPSHOT_AVAIL_SWAP_SIZE = 2148021011
+SNAPSHOT_CREATE_IMAGE = 1074017041
+SNAPSHOT_FREE = 13061
+SNAPSHOT_FREEZE = 13057
+SNAPSHOT_FREE_SWAP_PAGES = 13065
+SNAPSHOT_GET_IMAGE_SIZE = 2148021006
+SNAPSHOT_PLATFORM_SUPPORT = 13071
+SNAPSHOT_POWER_OFF = 13072
+SNAPSHOT_PREF_IMAGE_SIZE = 13074
+SNAPSHOT_S2RAM = 13067
+SNAPSHOT_SET_SWAP_AREA = 1074541325
+SNAPSHOT_UNFREEZE = 13058
+__NR_ioctl = 54
+__NR_openat = 288
+__NR_read = 3
+__NR_write = 4
diff --git a/sys/linux/sys.txt b/sys/linux/sys.txt
index 4f1b2d5f9..0589dc232 100644
--- a/sys/linux/sys.txt
+++ b/sys/linux/sys.txt
@@ -50,7 +50,6 @@ include <uapi/linux/kcov.h>
 include <uapi/linux/membarrier.h>
 include <uapi/linux/capability.h>
 include <uapi/linux/seccomp.h>
-include <uapi/linux/suspend_ioctls.h>
 include <kernel/sched/sched.h>
 include <uapi/linux/fsinfo.h>
 include <uapi/linux/close_range.h>
@@ -576,11 +575,6 @@ openat$ocfs2_control(fd const[AT_FDCWD], file ptr[in, string["/dev/ocfs2_control
 openat$nvme_fabrics(fd const[AT_FDCWD], file ptr[in, string["/dev/nvme-fabrics"]], flags flags[open_flags], mode const[0]) fd
 openat$bsg(fd const[AT_FDCWD], file ptr[in, string["/dev/bsg"]], flags flags[open_flags], mode const[0]) fd
 
-openat$snapshot(fd const[AT_FDCWD], file ptr[in, string["/dev/snapshot"]], flags flags[open_flags], mode const[0]) fd
-
-# SNAPSHOT_FREEZE is disabled because it can easily kill the machine.
-ioctl$SNAPSHOT_FREEZE(fd fd, cmd const[SNAPSHOT_FREEZE]) (disabled)
-
 pipefd {
 	rfd	fd
 	wfd	fd
diff --git a/sys/linux/sys_386.const b/sys/linux/sys_386.const
index d1999e9f6..d06e78113 100644
--- a/sys/linux/sys_386.const
+++ b/sys/linux/sys_386.const
@@ -503,7 +503,6 @@ SIGINFO_SIZE = 128
 SIG_BLOCK = 0
 SIG_SETMASK = 2
 SIG_UNBLOCK = 1
-SNAPSHOT_FREEZE = 13057
 SPLICE_F_GIFT = 8
 SPLICE_F_MORE = 4
 SPLICE_F_MOVE = 1
diff --git a/sys/linux/sys_amd64.const b/sys/linux/sys_amd64.const
index 08eb22ff7..8dcbcb1d9 100644
--- a/sys/linux/sys_amd64.const
+++ b/sys/linux/sys_amd64.const
@@ -503,7 +503,6 @@ SIGINFO_SIZE = 128
 SIG_BLOCK = 0
 SIG_SETMASK = 2
 SIG_UNBLOCK = 1
-SNAPSHOT_FREEZE = 13057
 SPLICE_F_GIFT = 8
 SPLICE_F_MORE = 4
 SPLICE_F_MOVE = 1
diff --git a/sys/linux/sys_arm.const b/sys/linux/sys_arm.const
index f84722518..255b09c6b 100644
--- a/sys/linux/sys_arm.const
+++ b/sys/linux/sys_arm.const
@@ -503,7 +503,6 @@ SIGINFO_SIZE = 128
 SIG_BLOCK = 0
 SIG_SETMASK = 2
 SIG_UNBLOCK = 1
-SNAPSHOT_FREEZE = 13057
 SPLICE_F_GIFT = 8
 SPLICE_F_MORE = 4
 SPLICE_F_MOVE = 1
diff --git a/sys/linux/sys_arm64.const b/sys/linux/sys_arm64.const
index 6ad56e240..6d6ca220f 100644
--- a/sys/linux/sys_arm64.const
+++ b/sys/linux/sys_arm64.const
@@ -503,7 +503,6 @@ SIGINFO_SIZE = 128
 SIG_BLOCK = 0
 SIG_SETMASK = 2
 SIG_UNBLOCK = 1
-SNAPSHOT_FREEZE = 13057
 SPLICE_F_GIFT = 8
 SPLICE_F_MORE = 4
 SPLICE_F_MOVE = 1
diff --git a/sys/linux/sys_mips64le.const b/sys/linux/sys_mips64le.const
index 2d5503b38..a9c01db82 100644
--- a/sys/linux/sys_mips64le.const
+++ b/sys/linux/sys_mips64le.const
@@ -503,7 +503,6 @@ SIGINFO_SIZE = 128
 SIG_BLOCK = 1
 SIG_SETMASK = 3
 SIG_UNBLOCK = 2
-SNAPSHOT_FREEZE = 536883969
 SPLICE_F_GIFT = 8
 SPLICE_F_MORE = 4
 SPLICE_F_MOVE = 1
diff --git a/sys/linux/sys_ppc64le.const b/sys/linux/sys_ppc64le.const
index 3915e89e5..e43cfe380 100644
--- a/sys/linux/sys_ppc64le.const
+++ b/sys/linux/sys_ppc64le.const
@@ -503,7 +503,6 @@ SIGINFO_SIZE = 128
 SIG_BLOCK = 0
 SIG_SETMASK = 2
 SIG_UNBLOCK = 1
-SNAPSHOT_FREEZE = 536883969
 SPLICE_F_GIFT = 8
 SPLICE_F_MORE = 4
 SPLICE_F_MOVE = 1
diff --git a/sys/linux/sys_riscv64.const b/sys/linux/sys_riscv64.const
index 55b6a2abd..0c758c9bd 100644
--- a/sys/linux/sys_riscv64.const
+++ b/sys/linux/sys_riscv64.const
@@ -503,7 +503,6 @@ SIGINFO_SIZE = 128
 SIG_BLOCK = 0
 SIG_SETMASK = 2
 SIG_UNBLOCK = 1
-SNAPSHOT_FREEZE = 13057
 SPLICE_F_GIFT = 8
 SPLICE_F_MORE = 4
 SPLICE_F_MOVE = 1
diff --git a/sys/linux/sys_s390x.const b/sys/linux/sys_s390x.const
index 1227daba1..42a111169 100644
--- a/sys/linux/sys_s390x.const
+++ b/sys/linux/sys_s390x.const
@@ -503,7 +503,6 @@ SIGINFO_SIZE = 128
 SIG_BLOCK = 0
 SIG_SETMASK = 2
 SIG_UNBLOCK = 1
-SNAPSHOT_FREEZE = 13057
 SPLICE_F_GIFT = 8
 SPLICE_F_MORE = 4
 SPLICE_F_MOVE = 1