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Olivier Gayot 51e0101ab9 block: fix conversion of GPT partition name to 7-bit commit `e06472bab2` upstream. The utf16_le_to_7bit function claims to, naively, convert a UTF-16 string to a 7-bit ASCII string. By naively, we mean that it: * drops the first byte of every character in the original UTF-16 string * checks if all characters are printable, and otherwise replaces them by exclamation mark "!". This means that theoretically, all characters outside the 7-bit ASCII range should be replaced by another character. Examples: * lower-case alpha (ɒ) 0x0252 becomes 0x52 (R) * ligature OE (œ) 0x0153 becomes 0x53 (S) * hangul letter pieup (ㅂ) 0x3142 becomes 0x42 (B) * upper-case gamma (Ɣ) 0x0194 becomes 0x94 (not printable) so gets replaced by "!" The result of this conversion for the GPT partition name is passed to user-space as PARTNAME via udev, which is confusing and feels questionable. However, there is a flaw in the conversion function itself. By dropping one byte of each character and using isprint() to check if the remaining byte corresponds to a printable character, we do not actually guarantee that the resulting character is 7-bit ASCII. This happens because we pass 8-bit characters to isprint(), which in the kernel returns 1 for many values > 0x7f - as defined in ctype.c. This results in many values which should be replaced by "!" to be kept as-is, despite not being valid 7-bit ASCII. Examples: * e with acute accent (é) 0x00E9 becomes 0xE9 - kept as-is because isprint(0xE9) returns 1. * euro sign (€) 0x20AC becomes 0xAC - kept as-is because isprint(0xAC) returns 1. This way has broken pyudev utility[1], fixes it by using a mask of 7 bits instead of 8 bits before calling isprint. Link: https://github.com/pyudev/pyudev/issues/490#issuecomment-2685794648 [1] Link: https://lore.kernel.org/linux-block/4cac90c2-e414-4ebb-ae62-2a4589d9dc6e@canonical.com/ Cc: Mulhern <amulhern@redhat.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: stable@vger.kernel.org Signed-off-by: Olivier Gayot <olivier.gayot@canonical.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250305022154.3903128-1-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-03-13 12:51:03 +01:00
arch	s390/traps: Fix test_monitor_call() inline assembly	2025-03-13 12:51:03 +01:00
block	block: fix conversion of GPT partition name to 7-bit	2025-03-13 12:51:03 +01:00
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drivers	rapidio: fix an API misues when rio_add_net() fails	2025-03-13 12:51:03 +01:00
fs	smb: client: Add check for next_buffer in receive_encrypted_standard()	2025-03-13 12:51:01 +01:00
include	vmlinux.lds: Ensure that const vars with relocations are mapped R/O	2025-03-13 12:51:00 +01:00
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kernel	sched/core: Prevent rescheduling when interrupts are disabled	2025-03-13 12:51:00 +01:00
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net	wifi: nl80211: reject cooked mode if it is set along with other flags	2025-03-13 12:51:03 +01:00
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sound	ALSA: hda/realtek: update ALC222 depop optimize	2025-03-13 12:51:02 +01:00
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README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.