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c2d466b9fe
In preparation for removing the strlcat API[1], replace the char *pp_buf
with a struct seq_buf, which tracks the current write position and
remaining space internally. This allows for:
- Direct use of seq_buf_printf() in place of snprintf()+strlcat()
pairs, eliminating local tmp buffers throughout.
- Adjacent strlcat() calls that build strings piece-by-piece
(e.g., strlcat("["); strlcat(name); strlcat("]")) to be collapsed
into single seq_buf_printf() calls.
- Simpler call sites: seq_buf_puts() takes only the buffer and string,
with no need to pass PAGE_SIZE at every call.
The backing buffer allocation is unchanged (__get_free_page), and the
output path uses seq_buf_str() to NUL-terminate before passing to
printk().
Link: https://github.com/KSPP/linux/issues/370 [1]
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Josh Law <objecting@objecting.org>
Signed-off-by: Kees Cook <kees@kernel.org>
Reviewed-by: Josh Law <objecting@objecting.org>
Link: https://patch.msgid.link/20260321004840.work.670-kees@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* fs/partitions/sgi.c
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*
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* Code extracted from drivers/block/genhd.c
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*/
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#include "check.h"
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#define SGI_LABEL_MAGIC 0x0be5a941
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enum {
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LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
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};
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struct sgi_disklabel {
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__be32 magic_mushroom; /* Big fat spliff... */
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__be16 root_part_num; /* Root partition number */
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__be16 swap_part_num; /* Swap partition number */
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s8 boot_file[16]; /* Name of boot file for ARCS */
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u8 _unused0[48]; /* Device parameter useless crapola.. */
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struct sgi_volume {
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s8 name[8]; /* Name of volume */
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__be32 block_num; /* Logical block number */
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__be32 num_bytes; /* How big, in bytes */
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} volume[15];
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struct sgi_partition {
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__be32 num_blocks; /* Size in logical blocks */
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__be32 first_block; /* First logical block */
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__be32 type; /* Type of this partition */
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} partitions[16];
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__be32 csum; /* Disk label checksum */
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__be32 _unused1; /* Padding */
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};
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int sgi_partition(struct parsed_partitions *state)
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{
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int i, csum;
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__be32 magic;
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int slot = 1;
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unsigned int start, blocks;
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__be32 *ui, cs;
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Sector sect;
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struct sgi_disklabel *label;
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struct sgi_partition *p;
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label = read_part_sector(state, 0, §);
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if (!label)
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return -1;
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p = &label->partitions[0];
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magic = label->magic_mushroom;
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if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
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put_dev_sector(sect);
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return 0;
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}
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ui = ((__be32 *) (label + 1)) - 1;
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for(csum = 0; ui >= ((__be32 *) label);) {
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cs = *ui--;
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csum += be32_to_cpu(cs);
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}
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if(csum) {
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printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
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state->disk->disk_name);
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put_dev_sector(sect);
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return 0;
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}
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/* All SGI disk labels have 16 partitions, disks under Linux only
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* have 15 minor's. Luckily there are always a few zero length
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* partitions which we don't care about so we never overflow the
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* current_minor.
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*/
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for(i = 0; i < 16; i++, p++) {
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blocks = be32_to_cpu(p->num_blocks);
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start = be32_to_cpu(p->first_block);
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if (blocks) {
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put_partition(state, slot, start, blocks);
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if (be32_to_cpu(p->type) == LINUX_RAID_PARTITION)
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state->parts[slot].flags = ADDPART_FLAG_RAID;
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}
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slot++;
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}
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seq_buf_puts(&state->pp_buf, "\n");
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put_dev_sector(sect);
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return 1;
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}
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