kernel/linux.git/block/partitions/efi.c, branch v7.0.10

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

block: use min() instead of min_t()

2025-11-20T14:44:29+00:00

min_t(unsigned int, a, b) casts an 'unsigned long' to 'unsigned int'. Use min(a, b) instead as it promotes any 'unsigned int' to 'unsigned long' and so cannot discard significant bits. In this case the 'unsigned long' value is small enough that the result is ok. (Similarly for max_t() and clamp_t().) Detected by an extra check added to min_t(). Signed-off-by: David Laight Signed-off-by: Jens Axboe

block: fix conversion of GPT partition name to 7-bit

2025-03-05T14:40:24+00:00

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 Cc: Davidlohr Bueso Cc: stable@vger.kernel.org Signed-off-by: Olivier Gayot Signed-off-by: Ming Lei Link: https://lore.kernel.org/r/20250305022154.3903128-1-ming.lei@redhat.com Signed-off-by: Jens Axboe

partitions/efi: use bdev_nr_bytes instead of open coding it

2021-10-19T12:16:50+00:00

Use the proper helper to read the block device size. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20211019062024.2171074-3-hch@lst.de Signed-off-by: Jens Axboe

partitions/efi: Support non-standard GPT location

2021-08-24T16:09:06+00:00

Support looking up GPT at a non-standard location specified by a block device driver. Acked-by: Davidlohr Bueso Reviewed-by: Christoph Hellwig Signed-off-by: Dmitry Osipenko Reviewed-by: Ulf Hansson Link: https://lore.kernel.org/r/20210820004536.15791-3-digetx@gmail.com Signed-off-by: Jens Axboe

block: store a gendisk in struct parsed_partitions

2021-08-12T16:31:35+00:00

Partition scanning only happens on the whole device, so pass a struct gendisk instead of the whole device block_device to the scanners. This allows to simplify printing the device name in various places as the disk name is available in disk->name. Signed-off-by: Christoph Hellwig Reviewed-by: Stefan Haberland Link: https://lore.kernel.org/r/20210810154512.1809898-2-hch@lst.de Signed-off-by: Jens Axboe

block/partitions/efi.c: Fix the efi_partition() kernel-doc header

2021-05-14T15:00:06+00:00

Fix the following kernel-doc warning: block/partitions/efi.c:685: warning: wrong kernel-doc identifier on line: * efi_partition(struct parsed_partitions *state) Cc: Alexander Viro Signed-off-by: Bart Van Assche Link: https://lore.kernel.org/r/20210513171708.8391-1-bvanassche@acm.org Signed-off-by: Jens Axboe

partitions/efi: Fix partition name parsing in GUID partition entry

2020-03-08T09:00:09+00:00

GUID partition entry defined to have a partition name as 36 UTF-16LE code units. This means that on big-endian platforms ASCII symbols would be read with 0xXX00 efi_char16_t character code. In order to correctly extract ASCII characters from a partition name field we should be converted from 16LE to CPU architecture. The problem exists on all big endian platforms. [ mingo: Minor edits. ] Fixes: eec7ecfede74 ("genhd, efi: add efi partition metadata to hd_structs") Reviewed-by: Christoph Hellwig Signed-off-by: Nikolai Merinov Signed-off-by: Ard Biesheuvel Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20200308080859.21568-29-ardb@kernel.org Link: https://lore.kernel.org/r/797777312.1324734.1582544319435.JavaMail.zimbra@inango-systems.com/

block: switch all files cleared marked as GPLv2 or later to SPDX tags

2019-04-30T22:11:59+00:00

All these files have some form of the usual GPLv2 or later boilerplate. Switch them to use SPDX tags instead. Reviewed-by: Chaitanya Kulkarni Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe