forked from Minki/linux
b8de524ce4
Users may have explicitly configured their debugfs permissions; we shouldn't overwrite those just because a second mount appeared. Only clobber if the options were provided at mount time. Existing behavior: ## Pre-existing status: debugfs is 0755. # chmod 755 /sys/kernel/debug/ # stat -c '%A' /sys/kernel/debug/ drwxr-xr-x ## New mount sets kernel-default permissions: # mount -t debugfs none /mnt/foo # stat -c '%A' /mnt/foo drwx------ ## Unexpected: the original mount changed permissions: # stat -c '%A' /sys/kernel/debug drwx------ New behavior: ## Pre-existing status: debugfs is 0755. # chmod 755 /sys/kernel/debug/ # stat -c '%A' /sys/kernel/debug/ drwxr-xr-x ## New mount inherits existing permissions: # mount -t debugfs none /mnt/foo # stat -c '%A' /mnt/foo drwxr-xr-x ## Expected: old mount is unchanged: # stat -c '%A' /sys/kernel/debug drwxr-xr-x Full test cases are being submitted to LTP. Signed-off-by: Brian Norris <briannorris@chromium.org> Link: https://lore.kernel.org/r/20220912163042.v3.1.Icbd40fce59f55ad74b80e5d435ea233579348a78@changeid Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| file.c | ||
| inode.c | ||
| internal.h | ||
| Makefile | ||