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AppImage / type2-runtime

The runtime is the executable part of every AppImage. It mounts the payload via FUSE and executes the entrypoint.
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Buffer overflow in libfuse patch #35

Open Bqleine opened 4 months ago

Bqleine commented 4 months ago

// For i = 4...99, check if there is a binary called "fusermount" + i // It is not yet known whether this will work for our purposes, but it is better than not even attempting for (int i = 4; i < 100; i++) { prog = findBinaryInFusermountDir("fusermount" + i); if (access(prog, X_OK) == 0) return prog; }

This adds to the string's pointer, it does not make a string concatenation at all. e.g it will lead to the following tries:

probonopd commented 4 months ago

Actually... won't

https://github.com/AppImage/type2-runtime/pull/32/files

fix this once it finally gets reviewed and merged?

Bqleine commented 4 months ago

The issue also got copied into these repositories: https://github.com/feather-wallet/feather/blob/c0a5a549f4f78b6e65efd12d4813aa2149afa7f9/contrib/depends/patches/libfuse/mount.c.diff#L4 https://github.com/probonopd/static-tools/blob/f0f6e679a001c4ad0e393f829a2396bf41f59cfe/patches/libfuse/mount.c.diff#L4