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Bind an empty directory over /data/resource-cache, not a tmpfs #1030

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Merged
JingMatrix merged 1 commit into from
Oct 24, 2026
Merged

Bind an empty directory over /data/resource-cache, not a tmpfs #1030

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11 changes: 9 additions & 2 deletions zygisk/module/daemon
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Original file line number Diff line number Diff line change
Expand Up @@ -25,9 +25,16 @@ if [ "$debug" = "true" ]; then
fi
fi

# Mount an empty temporary file system over /data/resource-cache to avoid possible overlay conflicts.
# Shadow /data/resource-cache with an empty directory of our own: initializing the framework assets
# in a root app_process forks `idmap2 create-multiple`, which would otherwise write the immutable
# framework idmaps of this boot into the cache every other process shares. Bind an empty directory
# rather than a tmpfs: a bind mount reuses the superblock of /data, so it claims none of the
# kernel-global anonymous device minors, whose gaps are visible from any process on the device.
# Note that this script runs inside an isolated mount namespace (via unshare).
mount tmpfs -t tmpfs /data/resource-cache
emptyDir="$dir/.resource-cache"
rm -rf "$emptyDir"
mkdir -p "$emptyDir"
mount -o bind "$emptyDir" /data/resource-cache

# Wait for Zygote socket using a polling loop
if [ ! -S "/dev/socket/zygote" ]; then
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