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| author |   Peter Hurley <peter@hurleysoftware.com> | 2013-11-22 07:16:25 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-25 08:36:56 -0800 |
| commit | c77569d2f3ef7844ee4ac7005a57da6898b302a8 (patch) | |
| tree | 9c7b1fffb698f410a86463fcc700bec3fca8f6fc /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | n_tty: Fix echo overrun tail computation (diff) | |
| download | linux-dev-c77569d2f3ef7844ee4ac7005a57da6898b302a8.tar.xz linux-dev-c77569d2f3ef7844ee4ac7005a57da6898b302a8.zip | |
n_tty: Fix 4096-byte canonical reads
Although the maximum allowable canonical line is specified to
be 255 bytes (MAX_CANON), the practical limit has actually been
the size of the line discipline read buffer (N_TTY_BUF_SIZE == 4096).
Commit 32f13521ca68bc624ff6effc77f308a52b038bf0,
n_tty: Line copy to user buffer in canonical mode, limited the
line copy to 4095 bytes. With a completely full line discipline
read buffer and a userspace buffer > 4095, _no_ data was copied,
and the read() syscall returned 0, indicating EOF.
Fix the interval arithmetic to compute the correct number of bytes
to copy to userspace in the range [1..4096].
Cc: <stable@vger.kernel.org> # 3.12.x
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions