[PATCH 3.19.y-ckt 091/160] n_tty: Fix poll() after buffer-limited eof push read

From	Kamal Mostafa <kamal@canonical.com>
Newsgroups	linux.kernel
Subject	[PATCH 3.19.y-ckt 091/160] n_tty: Fix poll() after buffer-limited eof push read
Date	2016-01-20 02:30 +0100
Message-ID	<qSPKY-7CF-57@gated-at.bofh.it> (permalink)
References	<qSPrA-7sT-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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3.19.8-ckt13 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Peter Hurley <peter@hurleysoftware.com>

commit ac8f3bf8832a405cc6e4dccb1d26d5cb2994d234 upstream.

commit 40d5e0905a03 ("n_tty: Fix EOF push handling") fixed EOF push
for reads. However, that approach still allows a condition mismatch
between poll() and read(), where poll() returns POLLIN but read()
blocks. This state can happen when a previous read() returned because
the user buffer was full and the next character was an EOF not at the
beginning of the line. While the next read() will properly identify
the condition and advance the read buffer tail without improperly
indicating an EOF file condition (ie., read() will not mistakenly
return 0), poll() will mistakenly indicate POLLIN.

Although a possible solution would be to peek at the input buffer
in n_tty_poll(), the better solution in this patch is to eat the
EOF during the previous read() (ie., fix the problem by eliminating
the condition).

The current canon line buffer copy limits the scan for next end-of-line
to the smaller of either,
   a. the remaining user buffer size
   b. completed lines in the input buffer
When the remaining user buffer size is exactly one less than the
end-of-line marked by EOF push, the EOF is not scanned nor skipped
but left for subsequent reads. In the example below, the scan
index 'eol' has stopped at the EOF because it is past the scan
limit of 5 (not because it has found the next set bit in read_flags)

   user buffer [*nr = 5]    _ _ _ _ _

   read_flags               0 0 0 0 0   1
   input buffer             h e l l o [EOF]
                            ^           ^
                           /           /
                         tail        eol

   result: found = 0, tail += 5, *nr += 5

Instead, allow the scan to peek ahead 1 byte (while still limiting the
scan to completed lines in the input buffer). For the example above,

   result: found = 1, tail += 6, *nr += 5

Because the scan limit is now bumped +1 byte, when the scan is
completed, the tail advance and the user buffer copy limit is
re-clamped to *nr when EOF is _not_ found.

Fixes: 40d5e0905a03 ("n_tty: Fix EOF push handling")
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/tty/n_tty.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index ba88b43..bcbd73d 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -2060,13 +2060,13 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
 	size_t eol;
 	size_t tail;
 	int ret, found = 0;
-	bool eof_push = 0;
 
 	/* N.B. avoid overrun if nr == 0 */
-	n = min(*nr, read_cnt(ldata));
-	if (!n)
+	if (!*nr)
 		return 0;
 
+	n = min(*nr + 1, read_cnt(ldata));
+
 	tail = ldata->read_tail & (N_TTY_BUF_SIZE - 1);
 	size = min_t(size_t, tail + n, N_TTY_BUF_SIZE);
 
@@ -2087,12 +2087,11 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
 	n = eol - tail;
 	if (n > 4096)
 		n += 4096;
-	n += found;
-	c = n;
+	c = n + found;
 
-	if (found && !ldata->push && read_buf(ldata, eol) == __DISABLED_CHAR) {
-		n--;
-		eof_push = !n && ldata->read_tail != ldata->line_start;
+	if (!found || read_buf(ldata, eol) != __DISABLED_CHAR) {
+		c = min(*nr, c);
+		n = c;
 	}
 
 	n_tty_trace("%s: eol:%zu found:%d n:%zu c:%zu size:%zu more:%zu\n",
@@ -2123,7 +2122,7 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
 			ldata->push = 0;
 		tty_audit_push(tty);
 	}
-	return eof_push ? -EAGAIN : 0;
+	return 0;
 }
 
 extern ssize_t redirected_tty_write(struct file *, const char __user *,
@@ -2292,10 +2291,7 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 
 		if (ldata->icanon && !L_EXTPROC(tty)) {
 			retval = canon_copy_from_read_buf(tty, &b, &nr);
-			if (retval == -EAGAIN) {
-				retval = 0;
-				continue;
-			} else if (retval)
+			if (retval)
 				break;
 		} else {
 			int uncopied;
-- 
1.9.1

Thread

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  [PATCH 3.19.y-ckt 087/160] drivers/base/memory.c: prohibit offlining of memory blocks with missing sections Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:30 +0100
  [PATCH 3.19.y-ckt 091/160] n_tty: Fix poll() after buffer-limited eof push read Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:30 +0100
  [PATCH 3.19.y-ckt 015/160] net: fix IP early demux races Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:30 +0100
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  [PATCH 3.19.y-ckt 114/160] xen/pciback: Save xen_pci_op commands before processing it Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:30 +0100
  [PATCH 3.19.y-ckt 011/160] net: qca_spi: fix transmit queue timeout handling Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:30 +0100
  [PATCH 3.19.y-ckt 058/160] IB/srp: Fix possible send queue overflow Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:30 +0100
  [PATCH 3.19.y-ckt 077/160] ARM: dts: vf610: use reset values for L2 cache latencies Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:30 +0100
  [PATCH 3.19.y-ckt 006/160] gre6: allow to update all parameters via rtnl Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:30 +0100
  [PATCH 3.19.y-ckt 001/160] [3.19-stable only] Revert "perf symbols: Fix dso lookup by long name and missing buildids" Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:30 +0100
  [PATCH 3.19.y-ckt 029/160] USB: cp210x: Remove CP2110 ID from compatibility list Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:30 +0100
  [PATCH 3.19.y-ckt 032/160] ext4: Fix handling of extended tv_sec Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 129/160] [PATCH] arm: fix handling of F_OFD_... in oabi_fcntl64() Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
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  [PATCH 3.19.y-ckt 117/160] xen/pciback: Do not install an IRQ handler for MSI interrupts. Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
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  [PATCH 3.19.y-ckt 008/160] sctp: use the same clock as if sock source timestamps were on Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 136/160] async_tx: use GFP_NOWAIT rather than GFP_IO Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 100/160] dma-debug: Fix dma_debug_entry offset calculation Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 090/160] ASoC: wm8974: set cache type for regmap Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 047/160] perf: Fix PERF_EVENT_IOC_PERIOD deadlock Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 027/160] usb: gadget: pxa27x: fix suspend callback Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 150/160] net: fix warnings in 'make htmldocs' by moving macro definition out of field declaration Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 092/160] tty: Fix GPF in flush_to_ldisc() Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 064/160] video: fbdev: fsl: Fix kernel crash when diu_ops is not implemented Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 053/160] dmaengine: at_xdmac: fix macro typo Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 076/160] ASoC: davinci-mcasp: Fix XDATA check in mcasp_start_tx Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 142/160] sctp: start t5 timer only when peer rwnd is 0 and local state is SHUTDOWN_PENDING Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 036/160] AHCI: Fix softreset failed issue of Port Multiplier Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 147/160] amd-xgbe: fix a couple timeout loops Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 141/160] sctp: convert sack_needed and sack_generation to bits Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 093/160] genirq: Prevent chip buslock deadlock Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 104/160] powerpc/powernv: Fix the overflow of OPAL message notifiers head array Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 107/160] s390/dis: Fix handling of format specifiers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 106/160] ALSA: hda - Set SKL+ hda controller power at freeze() and thaw() Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 128/160] ASoC: arizona: Fix bclk for sample rates that are multiple of 4kHz Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 009/160] sctp: update the netstamp_needed counter when copying sockets Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 116/160] xen/pciback: Return error on XEN_PCI_OP_enable_msix when device has MSI or MSI-X enabled Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 110/160] xen-netback: use RING_COPY_REQUEST() throughout Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 158/160] net: possible use after free in dst_release Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 051/160] net: mvpp2: fix buffers' DMA handling on RX path Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 055/160] vhost: relax log address alignment Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 067/160] dm thin metadata: fix bug when taking a metadata snapshot Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 160/160] firmware: dmi_scan: Fix UUID endianness for SMBIOS >= 2.6 Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 046/160] ARM: 8465/1: mm: keep reserved ASIDs in sync with mm after multiple rollovers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 010/160] sctp: also copy sk_tsflags when copying the socket Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 103/160] ARC: dw2 unwind: Ignore CIE version !=1 gracefully instead of bailing Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 002/160] sched/wait: Fix signal handling in bit wait helpers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 109/160] xen-netback: don't use last request to determine minimum Tx credit Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 105/160] powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 081/160] powercap / RAPL: fix BIOS lock check Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 023/160] KVM: x86: Reload pit counters for all channels when restoring state Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 080/160] USB: add quirk for devices with broken LPM Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 021/160] af_unix: Revert 'lock_interruptible' in stream receive code Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 049/160] ALSA: rme96: Fix unexpected volume reset after rate changes Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 079/160] xhci: fix usb2 resume timing and races. Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 132/160] ftrace/scripts: Fix incorrect use of sprintf in recordmcount Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 056/160] virtio: fix memory leak of virtio ida cache layers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 007/160] atl1c: Improve driver not to do order 4 GFP_ATOMIC allocation Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 140/160] usb: musb: USB_TI_CPPI41_DMA requires dmaengine support Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 083/160] mm: hugetlb: fix hugepage memory leak caused by wrong reserve count Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 094/160] ALSA: usb-audio: Add a more accurate volume quirk for AudioQuest DragonFly Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 157/160] net: sched: fix missing free per cpu on qstats Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 135/160] ARM: versatile: fix MMC/SD interrupt assignment Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 070/160] ASoC: es8328: Fix deemphasis values Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 096/160] ARM: 8471/1: need to save/restore arm register(r11) when it is corrupted Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 061/160] radeon/cik: Fix GFX IB test on Big-Endian Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 043/160] usb: Use the USB_SS_MULT() macro to decode burst multiplier for log message Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 146/160] mISDN: fix a loop count Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 145/160] sh_eth: fix TX buffer byte-swapping Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 123/160] x86/mce: Ensure offline CPUs don't participate in rendezvous process Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 013/160] net: add validation for the socket syscall protocol argument Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 078/160] ses: fix additional element traversal bug Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 075/160] vgaarb: fix signal handling in vga_get() Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 089/160] sh64: fix __NR_fgetxattr Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100

csiph-web