af_unix: use scoped_with_init_fs() for coredump socket lookup

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Use scoped_with_init_fs() to temporarily override current->fs for the
coredump unix socket path resolution. This replaces the init_root() +
vfs_path_lookup() pattern with scoped_with_init_fs() + kern_path().

The old code used LOOKUP_BENEATH to confine the lookup beneath init's
root. This is dropped because the coredump socket path is absolute and
resolved from root (where ".." is a no-op), and LOOKUP_NO_SYMLINKS
already blocks any symlink-based escape. LOOKUP_BENEATH was redundant
in this context.

unix_find_bsd(SOCK_COREDUMP) ← coredump_sock_connect() ← do_coredump() —
same crashing userspace process

Same security rationale as coredump.

Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-18-77ee053060e0@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-06-01 15:56:51 +02:00

parent d0f102fce3

commit 09eca26e7e

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net/unix/af_unix.c

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