The patch titled
tty: lock ticogwinsz
has been added to the -mm tree. Its filename is
tty-lock-ticogwinsz.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: tty: lock ticogwinsz
From: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Now we lock the set ioctl its trivial to lock the get one so the data
copied is consistent. At the moment we have the BKL here but this removes
the need for it and is a step in the right direction
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/char/tty_io.c | 17 ++++++++++-------
1 files changed, 10 insertions(+), 7 deletions(-)
diff -puN drivers/char/tty_io.c~tty-lock-ticogwinsz drivers/char/tty_io.c
--- a/drivers/char/tty_io.c~tty-lock-ticogwinsz
+++ a/drivers/char/tty_io.c
@@ -2740,18 +2740,21 @@ static int tiocsti(struct tty_struct *tt
* @tty; tty
* @arg: user buffer for result
*
- * Copies the kernel idea of the window size into the user buffer. No
- * locking is done.
+ * Copies the kernel idea of the window size into the user buffer.
*
- * FIXME: Returning random values racing a window size set is wrong
- * should lock here against that
+ * Locking: tty->termios_sem is taken to ensure the winsize data
+ * is consistent.
*/
static int tiocgwinsz(struct tty_struct *tty, struct winsize __user * arg)
{
- if (copy_to_user(arg, &tty->winsize, sizeof(*arg)))
- return -EFAULT;
- return 0;
+ int err;
+
+ down(&tty->termios_sem);
+ err = copy_to_user(arg, &tty->winsize, sizeof(*arg));
+ up(&tty->termios_sem);
+
+ return err ? -EFAULT: 0;
}
/**
_
Patches currently in -mm which might be from alan@xxxxxxxxxxxxxxxxxxx are
tty-layer-comment-the-locking-assumptions-and-functions.patch
fix-tty-layer-dos-and-comment-relevant-code.patch
git-libata-all.patch
1-of-2-jmicron-driver.patch
1-of-2-jmicron-driver-hard_port_no-fix.patch
2-of-2-jmicron-driver-plumbing-and-quirk.patch
non-libata-driver-for-jmicron-devices.patch
via-pata-controller-xfer-fixes.patch
git-net.patch
netfilter-make-unused-signal-code-go-away-so-nobody-copies-its-broken-ness.patch
megaraid-gcc-41-warning-fix.patch
voyager-tty-locking.patch
edac-new-opteron-athlon64-memory-controller-driver.patch
edac-new-opteron-athlon64-memory-controller-driver-tidy.patch
sanitize-3c589_cs.patch
make-prot_write-imply-prot_read.patch
sgiioc4-fixup-use-of-mmio-ops.patch
remove-unused-tty_struct-variable.patch
there-is-no-devfs-there-has-never-been-a-devfs-we-have.patch
tty-locking-on-resize.patch
ahci-ati-sb600-sata-support-for-various-modes.patch
atiixp-ati-sb600-ide-support-for-various-modes.patch
dquot-add-proper-locking-when-using-current-signal-tty.patch
tty-trivial-kzalloc-opportunity.patch
tty-lock-ticogwinsz.patch
ide-claim-extra-dma-ports-regardless-of-channel.patch
ide-always-release-dma-engine.patch
ide-error-handling-fixes.patch
ide-hpt3xxn-clocking-fixes.patch
ide-fix-hpt37x-timing-tables.patch
ide-optimize-hpt37x-timing-tables.patch
ide-fix-hpt3xx-hotswap-support.patch
ide-fix-the-case-of-multiple-hpt3xx-chips-present.patch
ide-hpt3xx-fix-pci-clock-detection.patch
ide-hpt3xx-fix-pci-clock-detection-fix-2.patch
piix-fix-82371mx-enablebits.patch
piix-remove-check-for-broken-mw-dma-mode-0.patch
piix-slc90e66-pio-mode-fallback-fix.patch
make-number-of-ide-interfaces-configurable.patch
ide_dma_speed-fixes.patch
hpt3xx-rework-rate-filtering.patch
hpt3xx-rework-rate-filtering-tidy.patch
hpt3xx-print-the-real-chip-name-at-startup.patch
hpt3xx-switch-to-using-pci_get_slot.patch
hpt3xx-cache-channels-mcr-address.patch
hpt3x7-merge-speedproc-handlers.patch
hpt370-clean-up-dma-timeout-handling.patch
enable-cdrom-dma-access-with-pdc20265_old.patch
ide-fix-revision-comparison-in-ide_in_drive_list.patch
ide-backport-piix-fixes-from-libata-into-the-legacy-driver.patch
hpt3xx-init-code-rewrite.patch
move-ide-to-unmaintained-drop-reference-to-old-git-tree.patch
drivers-ide-cleanups.patch
ide-remove-dma_base2-field-from-ide_hwif_t.patch
ide-reprogram-disk-pio-timings-on-resume.patch
asus-mv-ide-device-ids.patch
ide-support-for-via-8237a-southbridge.patch
config_pm=n-slim-drivers-ide-pci-sc1200c.patch
ide-check-that-generic_chipset-table-sizes-are-correct.patch
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