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Groups > linux.kernel > #1316012
| From | Luis Henriques <luis.henriques@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.16.y-ckt 062/128] n_tty: Fix poll() after buffer-limited eof push read |
| Date | 2016-01-24 23:10 +0100 |
| Message-ID | <qUB1a-2KY-61@gated-at.bofh.it> (permalink) |
| References | <qUB17-2KY-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.16.7-ckt23 -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>
---
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 29de4bfe5c70..d239fdba29d6 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -2048,13 +2048,13 @@ 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);
@@ -2075,12 +2075,11 @@ 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",
@@ -2111,7 +2110,7 @@ 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 *,
@@ -2299,10 +2298,7 @@ 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;
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[PATCH 3.16.y-ckt 058/128] ses: Fix problems with simple enclosures Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:30 +0100
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[PATCH 3.16.y-ckt 046/128] ocfs2: fix SGID not inherited issue Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
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[PATCH 3.16.y-ckt 050/128] MIPS: uaccess: Take EVA into account in __copy_from_user() Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 037/128] dm btree: fix bufio buffer leaks in dm_btree_del() error path Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 051/128] MIPS: uaccess: Take EVA into account in [__]clear_user Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 007/128] ext4: Fix handling of extended tv_sec Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
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[PATCH 3.16.y-ckt 035/128] dm space map metadata: fix ref counting bug when bootstrapping a new space map Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 032/128] radeon: Fix VCE IB test on Big-Endian systems Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 043/128] mm, vmstat: allow WQ concurrency to discover memory reclaim doesn't make any progress Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 041/128] parisc iommu: fix panic due to trying to allocate too large region Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 048/128] usb: musb: USB_TI_CPPI41_DMA requires dmaengine support Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 047/128] sh64: fix __NR_fgetxattr Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 038/128] vgaarb: fix signal handling in vga_get() Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 044/128] mm: hugetlb: call huge_pte_alloc() only if ptep is null Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 029/128] 9p: ->evict_inode() should kick out ->i_data, not ->i_mapping Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:40 +0100
[PATCH 3.16.y-ckt 028/128] ALSA: hda - Fixing speaker noise on the two latest thinkpad models Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
[PATCH 3.16.y-ckt 025/128] nfs4: limit callback decoding to received bytes Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
[PATCH 3.16.y-ckt 021/128] usb: xhci: fix config fail of FS hub behind a HS hub with MTT Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
[PATCH 3.16.y-ckt 026/128] SUNRPC: Fix callback channel Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
[PATCH 3.16.y-ckt 020/128] perf: Fix PERF_EVENT_IOC_PERIOD deadlock Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
[PATCH 3.16.y-ckt 024/128] virtio: fix memory leak of virtio ida cache layers Luis Henriques <luis.henriques@canonical.com> - 2016-01-24 23:50 +0100
[PATCH 3.16.y-ckt 129/129] Revert "[stable-only] net: add length argument to skb_copy_and_csum_datagram_iovec" Luis Henriques <luis.henriques@canonical.com> - 2016-01-25 12:00 +0100
csiph-web