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97b67e64afdynamic_dname() has had an implicit limit of 64 characters since it was introduced in commitc23fbb6bcb("VFS: delay the dentry name generation on sockets and pipes"), however it seems that this was a fairly arbitrary number (suspiciously it was double the previously hardcoded buffer size). NAME_MAX seems like a more reasonable and consistent limit for d_name lengths. While we're at it, we can also remove the unnecessary stack-allocated array and just memmove() the formatted string to the end of the buffer. It should also be noted that at least one driver (in particular, liveupdate's usage of anon_inode for session files) already exceeded this limit without noticing that readlink(/proc/self/fd/$n) always returns -ENAMETOOLONG, so this fixes those drivers as well. Fixes:0153094d03("liveupdate: luo_session: add sessions support") Fixes:c23fbb6bcb("VFS: delay the dentry name generation on sockets and pipes") Signed-off-by: Aleksa Sarai <aleksa@amutable.com> Link: https://patch.msgid.link/20260401-dynamic-dname-name_max-v1-1-8ca20ab2642e@amutable.com Tested-by: Luca Boccassi <luca.boccassi@gmail.com> Signed-off-by: Christian Brauner <brauner@kernel.org>
449 lines
12 KiB
449 lines
12 KiB