| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1200052699-28420-7-git-send-email-bbpetkov@yahoo.de>
Date: Fri, 11 Jan 2008 12:58:04 +0100
From: Borislav Petkov <bbpetkov@...oo.de>
To: Bartlomiej@...lum.tnic, Zolnierkiewicz@...lum.tnic,
<bzolnier@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
Borislav Petkov <bbpetkov@...oo.de>
Subject: [PATCH 06/21] ide-floppy: remove struct idefloppy_flexible_disk_page
The driver used to test whether the flexible disk page has changed by memcmp-ing
it with a cached copy of a previous version of the page from a different remo-
vable medium. Since, according to the SFF-8070i spec, the flexible disk page
"specifies parameters relating to the currently installed medium type," this
comparison is now done by simply checking whether the medium has changed.
Signed-off-by: Borislav Petkov <bbpetkov@...oo.de>
---
drivers/ide/ide-floppy.c | 89 ++++++++++++++++-----------------------------
1 files changed, 32 insertions(+), 57 deletions(-)
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 2b9885f..679d48e 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -120,33 +120,6 @@ typedef struct idefloppy_packet_command_s {
#define PC_SUPPRESS_ERROR 6 /* Suppress error reporting */
/*
- * Flexible disk page.
- */
-typedef struct {
-#if defined(__LITTLE_ENDIAN_BITFIELD)
- unsigned page_code :6; /* Page code - Should be 0x5 */
- unsigned reserved1_6 :1; /* Reserved */
- unsigned ps :1; /* The device is capable of saving the page */
-#elif defined(__BIG_ENDIAN_BITFIELD)
- unsigned ps :1; /* The device is capable of saving the page */
- unsigned reserved1_6 :1; /* Reserved */
- unsigned page_code :6; /* Page code - Should be 0x5 */
-#else
-#error "Bitfield endianness not defined! Check your byteorder.h"
-#endif
- u8 page_length; /* Page Length - Should be 0x1e */
- u16 transfer_rate; /* In kilobits per second */
- u8 heads, sectors; /* Number of heads, Number of sectors per track */
- u16 sector_size; /* Byes per sector */
- u16 cyls; /* Number of cylinders */
- u8 reserved10[10];
- u8 motor_delay; /* Motor off delay */
- u8 reserved21[7];
- u16 rpm; /* Rotations per minute */
- u8 reserved30[2];
-} idefloppy_flexible_disk_page_t;
-
-/*
* Format capacity
*/
typedef struct {
@@ -213,8 +186,6 @@ typedef struct ide_floppy_obj {
int blocks, block_size, bs_factor;
/* Last format capacity */
idefloppy_capacity_descriptor_t capacity;
- /* Copy of the flexible disk page */
- idefloppy_flexible_disk_page_t flexible_disk_page;
/* Write protect */
int wp;
/* Supports format progress report */
@@ -1188,50 +1159,54 @@ static int idefloppy_queue_pc_tail (ide_drive_t *drive,idefloppy_pc_t *pc)
}
/*
- * Look at the flexible disk page parameters. We will ignore the CHS
- * capacity parameters and use the LBA parameters instead.
+ * Look at the flexible disk page parameters. We will ignore the CHS capacity
+ * parameters and use the LBA parameters instead.
*/
-static int idefloppy_get_flexible_disk_page (ide_drive_t *drive)
+static int idefloppy_get_flexible_disk_page(ide_drive_t *drive)
{
idefloppy_floppy_t *floppy = drive->driver_data;
idefloppy_pc_t pc;
- idefloppy_mode_parameter_header_t *header;
- idefloppy_flexible_disk_page_t *page;
int capacity, lba_capacity;
+ u8 heads, sectors;
+ u16 transfer_rate, sector_size, cyls, rpm;
- idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE, MODE_SENSE_CURRENT);
- if (idefloppy_queue_pc_tail(drive,&pc)) {
- printk(KERN_ERR "ide-floppy: Can't get flexible disk "
- "page parameters\n");
+ idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE,
+ MODE_SENSE_CURRENT);
+
+ if (idefloppy_queue_pc_tail(drive, &pc)) {
+ printk(KERN_ERR "ide-floppy: Can't get flexible disk page"
+ " parameters\n");
return 1;
}
- header = (idefloppy_mode_parameter_header_t *) pc.buffer;
- floppy->wp = header->wp;
+ floppy->wp = pc.buffer[3] & 0x80;
set_disk_ro(floppy->disk, floppy->wp);
- page = (idefloppy_flexible_disk_page_t *) (header + 1);
-
- page->transfer_rate = be16_to_cpu(page->transfer_rate);
- page->sector_size = be16_to_cpu(page->sector_size);
- page->cyls = be16_to_cpu(page->cyls);
- page->rpm = be16_to_cpu(page->rpm);
- capacity = page->cyls * page->heads * page->sectors * page->sector_size;
- if (memcmp (page, &floppy->flexible_disk_page, sizeof (idefloppy_flexible_disk_page_t)))
+
+ transfer_rate = be16_to_cpu(*(u16 *)&pc.buffer[8 + 2]);
+ sector_size = be16_to_cpu(*(u16 *)&pc.buffer[8 + 6]);
+ cyls = be16_to_cpu(*(u16 *)&pc.buffer[8 + 8]);
+ rpm = be16_to_cpu(*(u16 *)&pc.buffer[8 + 28]);
+ heads = pc.buffer[8 + 4];
+ sectors = pc.buffer[8 + 5];
+
+ capacity = cyls * heads * sectors * sector_size;
+
+ if ((1UL << IDEFLOPPY_MEDIA_CHANGED) & floppy->flags)
printk(KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, "
"%d sector size, %d rpm\n",
- drive->name, capacity / 1024, page->cyls,
- page->heads, page->sectors,
- page->transfer_rate / 8, page->sector_size, page->rpm);
-
- floppy->flexible_disk_page = *page;
- drive->bios_cyl = page->cyls;
- drive->bios_head = page->heads;
- drive->bios_sect = page->sectors;
+ drive->name, capacity / 1024, cyls, heads, sectors,
+ transfer_rate / 8, sector_size, rpm);
+
+ drive->bios_cyl = cyls;
+ drive->bios_head = heads;
+ drive->bios_sect = sectors;
lba_capacity = floppy->blocks * floppy->block_size;
+
if (capacity < lba_capacity) {
printk(KERN_NOTICE "%s: The disk reports a capacity of %d "
"bytes, but the drive only handles %d\n",
drive->name, lba_capacity, capacity);
- floppy->blocks = floppy->block_size ? capacity / floppy->block_size : 0;
+ floppy->blocks = floppy->block_size ?
+ capacity / floppy->block_size : 0;
}
return 0;
}
--
1.5.3.7
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists