coredump: use scoped_with_init_fs() for coredump path resolution

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Use scoped_with_init_fs() to temporarily override current->fs for
the filp_open() call so the coredump path lookup happens in init's
filesystem context. This replaces the init_root() + file_open_root()
pattern with the simpler scoped override.

coredump_file() ← do_coredump() ← vfs_coredump() ← get_signal() — runs
as the crashing userspace process

Uses init's root to prevent a chrooted/user-namespaced process from
controlling where suid coredumps land. Not a kthread, but intentionally
needs init's fs for security.

Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-11-77ee053060e0@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-06-01 15:56:44 +02:00

parent f565f3b064

commit fea1107ff3

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1 changed files with 3 additions and 8 deletions

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fs/coredump.c

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