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device: fix alignment on 32-bit machines and test for it

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The test previously checked the offset within a substruct, not the
offset within the allocated struct, so this adds the two together.

It then fixes an alignment crash on 32-bit machines.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2021-02-09 15:30:32 +01:00
parent d6e76fdbd6
commit d7bc7508e5
2 changed files with 2 additions and 8 deletions
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3
device/alignment_test.go
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@ -61,6 +61,5 @@ func TestDeviceAlignment(t *testing.T) {
field.Type.Align(),
)
}
checkAlignment(t, "Device.rate.underLoadUntil", unsafe.Offsetof(d.rate.underLoadUntil))
checkAlignment(t, "Device.rate.underLoadUntil", unsafe.Offsetof(d.rate)+unsafe.Offsetof(d.rate.underLoadUntil))
}

7
device/device.go
View File

@ -21,10 +21,6 @@ import (
)
type Device struct {
log *Logger
// synchronized resources (locks acquired in order)
state struct {
// state holds the device's state. It is accessed atomically.
// Use the device.deviceState method to read it.
@ -64,8 +60,6 @@ type Device struct {
keyMap map[NoisePublicKey]*Peer
}
// unprotected / "self-synchronising resources"
allowedips AllowedIPs
indexTable IndexTable
cookieChecker CookieChecker
@ -94,6 +88,7 @@ type Device struct {
ipcMutex sync.RWMutex
closed chan struct{}
log *Logger
}
// deviceState represents the state of a Device.