Denys Vlasenko 9468ea06d2 lsattr,chattr: do not open e.g. device files unless asked directly; do not follow links ...

Add O_NOFOLLOW (and O_NOCTTY for good measure) to open calls like e2fsprogs does.

In lsattr, when recursing, operate only on regular files, symlinks, and directories.
(Otherwise, "lsattr /dev" can e.g. open a watchdog device... not good).

At this time, looks like chattr/lsattr can't operate on symlink inodes -
ioctls do not work on open(O_PATH | O_NOFOLLOW) fds.

function                                             old     new   delta
lsattr_dir_proc                                      168     203     +35
change_attributes                                    410     408      -2
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(add/remove: 0/0 grow/shrink: 1/1 up/down: 35/-2)              Total: 33 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2021-06-24 01:07:56 +02:00

7.3 KiB

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