| 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: <20200224212352.8640-11-w@1wt.eu>
Date: Mon, 24 Feb 2020 22:23:52 +0100
From: Willy Tarreau <w@....eu>
To: Denis Efremov <efremov@...ux.com>
Cc: Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
linux-block@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Willy Tarreau <w@....eu>
Subject: [PATCH 10/10] floppy: cleanup: expand the reply_buffer macros
Several macros were used to access reply_buffer[] at discrete positions
without making it obvious they were relying on this. These ones have
been replaced by their offset in the reply buffer to make these accesses
more obvious.
Signed-off-by: Willy Tarreau <w@....eu>
---
drivers/block/floppy.c | 86 +++++++++++++++++++++++++++-----------------------
1 file changed, 47 insertions(+), 39 deletions(-)
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 0d53335..d521899 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -341,14 +341,14 @@ static bool initialized;
#define MAX_REPLIES 16
static unsigned char reply_buffer[MAX_REPLIES];
static int inr; /* size of reply buffer, when called from interrupt */
-#define ST0 (reply_buffer[0])
-#define ST1 (reply_buffer[1])
-#define ST2 (reply_buffer[2])
-#define ST3 (reply_buffer[0]) /* result of GETSTATUS */
-#define R_TRACK (reply_buffer[3])
-#define R_HEAD (reply_buffer[4])
-#define R_SECTOR (reply_buffer[5])
-#define R_SIZECODE (reply_buffer[6])
+#define ST0 0
+#define ST1 1
+#define ST2 2
+#define ST3 0 /* result of GETSTATUS */
+#define R_TRACK 3
+#define R_HEAD 4
+#define R_SECTOR 5
+#define R_SIZECODE 6
#define SEL_DLY (2 * HZ / 100)
@@ -1366,34 +1366,37 @@ static int fdc_dtr(void)
static void tell_sector(void)
{
pr_cont(": track %d, head %d, sector %d, size %d",
- R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
+ reply_buffer[R_TRACK], reply_buffer[R_HEAD],
+ reply_buffer[R_SECTOR],
+ reply_buffer[R_SIZECODE]);
} /* tell_sector */
static void print_errors(void)
{
DPRINT("");
- if (ST0 & ST0_ECE) {
+ if (reply_buffer[ST0] & ST0_ECE) {
pr_cont("Recalibrate failed!");
- } else if (ST2 & ST2_CRC) {
+ } else if (reply_buffer[ST2] & ST2_CRC) {
pr_cont("data CRC error");
tell_sector();
- } else if (ST1 & ST1_CRC) {
+ } else if (reply_buffer[ST1] & ST1_CRC) {
pr_cont("CRC error");
tell_sector();
- } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
- (ST2 & ST2_MAM)) {
+ } else if ((reply_buffer[ST1] & (ST1_MAM | ST1_ND)) ||
+ (reply_buffer[ST2] & ST2_MAM)) {
if (!probing) {
pr_cont("sector not found");
tell_sector();
} else
pr_cont("probe failed...");
- } else if (ST2 & ST2_WC) { /* seek error */
+ } else if (reply_buffer[ST2] & ST2_WC) { /* seek error */
pr_cont("wrong cylinder");
- } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
+ } else if (reply_buffer[ST2] & ST2_BC) { /* cylinder marked as bad */
pr_cont("bad cylinder");
} else {
pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
- ST0, ST1, ST2);
+ reply_buffer[ST0], reply_buffer[ST1],
+ reply_buffer[ST2]);
tell_sector();
}
pr_cont("\n");
@@ -1417,28 +1420,28 @@ static int interpret_errors(void)
}
/* check IC to find cause of interrupt */
- switch (ST0 & ST0_INTR) {
+ switch (reply_buffer[ST0] & ST0_INTR) {
case 0x40: /* error occurred during command execution */
- if (ST1 & ST1_EOC)
+ if (reply_buffer[ST1] & ST1_EOC)
return 0; /* occurs with pseudo-DMA */
bad = 1;
- if (ST1 & ST1_WP) {
+ if (reply_buffer[ST1] & ST1_WP) {
DPRINT("Drive is write protected\n");
clear_bit(FD_DISK_WRITABLE_BIT,
&drive_state[current_drive].flags);
cont->done(0);
bad = 2;
- } else if (ST1 & ST1_ND) {
+ } else if (reply_buffer[ST1] & ST1_ND) {
set_bit(FD_NEED_TWADDLE_BIT,
&drive_state[current_drive].flags);
- } else if (ST1 & ST1_OR) {
+ } else if (reply_buffer[ST1] & ST1_OR) {
if (drive_params[current_drive].flags & FTD_MSG)
DPRINT("Over/Underrun - retrying\n");
bad = 0;
} else if (*errors >= drive_params[current_drive].max_errors.reporting) {
print_errors();
}
- if (ST2 & ST2_WC || ST2 & ST2_BC)
+ if (reply_buffer[ST2] & ST2_WC || reply_buffer[ST2] & ST2_BC)
/* wrong cylinder => recal */
drive_state[current_drive].track = NEED_2_RECAL;
return bad;
@@ -1522,14 +1525,16 @@ static int blind_seek;
static void seek_interrupt(void)
{
debugt(__func__, "");
- if (inr != 2 || (ST0 & 0xF8) != 0x20) {
+ if (inr != 2 || (reply_buffer[ST0] & 0xF8) != 0x20) {
DPRINT("seek failed\n");
drive_state[current_drive].track = NEED_2_RECAL;
cont->error();
cont->redo();
return;
}
- if (drive_state[current_drive].track >= 0 && drive_state[current_drive].track != ST1 && !blind_seek) {
+ if (drive_state[current_drive].track >= 0 &&
+ drive_state[current_drive].track != reply_buffer[ST1] &&
+ !blind_seek) {
debug_dcl(drive_params[current_drive].flags,
"clearing NEWCHANGE flag because of effective seek\n");
debug_dcl(drive_params[current_drive].flags, "jiffies=%lu\n",
@@ -1539,7 +1544,7 @@ static void seek_interrupt(void)
/* effective seek */
drive_state[current_drive].select_date = jiffies;
}
- drive_state[current_drive].track = ST1;
+ drive_state[current_drive].track = reply_buffer[ST1];
floppy_ready();
}
@@ -1559,8 +1564,8 @@ static void check_wp(void)
debug_dcl(drive_params[current_drive].flags,
"checking whether disk is write protected\n");
debug_dcl(drive_params[current_drive].flags, "wp=%x\n",
- ST3 & 0x40);
- if (!(ST3 & 0x40))
+ reply_buffer[ST3] & 0x40);
+ if (!(reply_buffer[ST3] & 0x40))
set_bit(FD_DISK_WRITABLE_BIT,
&drive_state[current_drive].flags);
else
@@ -1634,7 +1639,7 @@ static void recal_interrupt(void)
debugt(__func__, "");
if (inr != 2)
fdc_state[fdc].reset = 1;
- else if (ST0 & ST0_ECE) {
+ else if (reply_buffer[ST0] & ST0_ECE) {
switch (drive_state[current_drive].track) {
case NEED_1_RECAL:
debugt(__func__, "need 1 recal");
@@ -1672,7 +1677,7 @@ static void recal_interrupt(void)
break;
}
} else
- drive_state[current_drive].track = ST1;
+ drive_state[current_drive].track = reply_buffer[ST1];
floppy_ready();
}
@@ -1734,7 +1739,7 @@ irqreturn_t floppy_interrupt(int irq, void *dev_id)
if (do_print)
print_result("sensei", inr);
max_sensei--;
- } while ((ST0 & 0x83) != UNIT(current_drive) &&
+ } while ((reply_buffer[ST0] & 0x83) != UNIT(current_drive) &&
inr == 2 && max_sensei);
}
if (!handler) {
@@ -2292,7 +2297,7 @@ static void rw_interrupt(void)
int heads;
int nr_sectors;
- if (R_HEAD >= 2) {
+ if (reply_buffer[R_HEAD] >= 2) {
/* some Toshiba floppy controllers occasionnally seem to
* return bogus interrupts after read/write operations, which
* can be recognized by a bad head number (>= 2) */
@@ -2305,7 +2310,7 @@ static void rw_interrupt(void)
nr_sectors = 0;
ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4);
- if (ST1 & ST1_EOC)
+ if (reply_buffer[ST1] & ST1_EOC)
eoc = 1;
else
eoc = 0;
@@ -2315,17 +2320,20 @@ static void rw_interrupt(void)
else
heads = 1;
- nr_sectors = (((R_TRACK - raw_cmd->cmd[TRACK]) * heads +
- R_HEAD - raw_cmd->cmd[HEAD]) * raw_cmd->cmd[SECT_PER_TRACK] +
- R_SECTOR - raw_cmd->cmd[SECTOR] + eoc) << raw_cmd->cmd[SIZECODE] >> 2;
+ nr_sectors = (((reply_buffer[R_TRACK] - raw_cmd->cmd[TRACK]) * heads +
+ reply_buffer[R_HEAD] - raw_cmd->cmd[HEAD]) * raw_cmd->cmd[SECT_PER_TRACK] +
+ reply_buffer[R_SECTOR] - raw_cmd->cmd[SECTOR] + eoc) << raw_cmd->cmd[SIZECODE] >> 2;
if (nr_sectors / ssize >
DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
DPRINT("long rw: %x instead of %lx\n",
nr_sectors, current_count_sectors);
- pr_info("rs=%d s=%d\n", R_SECTOR, raw_cmd->cmd[SECTOR]);
- pr_info("rh=%d h=%d\n", R_HEAD, raw_cmd->cmd[HEAD]);
- pr_info("rt=%d t=%d\n", R_TRACK, raw_cmd->cmd[TRACK]);
+ pr_info("rs=%d s=%d\n", reply_buffer[R_SECTOR],
+ raw_cmd->cmd[SECTOR]);
+ pr_info("rh=%d h=%d\n", reply_buffer[R_HEAD],
+ raw_cmd->cmd[HEAD]);
+ pr_info("rt=%d t=%d\n", reply_buffer[R_TRACK],
+ raw_cmd->cmd[TRACK]);
pr_info("heads=%d eoc=%d\n", heads, eoc);
pr_info("spt=%d st=%d ss=%d\n",
raw_cmd->cmd[SECT_PER_TRACK], fsector_t, ssize);
--
2.9.0
Powered by blists - more mailing lists