linux-dev/drivers/misc/sgi-gru/grukdump.c, branch linus/master

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

2019-05-30T18:26:35Z

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman

drivers/misc/sgi-gru: fix Spectre v1 vulnerability

2018-11-11T17:13:19Z

req.gid can be indirectly controlled by user-space, hence leading to a potential exploitation of the Spectre variant 1 vulnerability. This issue was detected with the help of Smatch: vers/misc/sgi-gru/grukdump.c:200 gru_dump_chiplet_request() warn: potential spectre issue 'gru_base' [w] Fix this by sanitizing req.gid before calling macro GID_TO_GRU, which uses it to index gru_base. Notice that given that speculation windows are large, the policy is to kill the speculation on the first load and not worry if it can be completed with a dependent load/store [1]. [1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2 Cc: stable@vger.kernel.org Signed-off-by: Gustavo A. R. Silva Signed-off-by: Greg Kroah-Hartman

drivers/misc/sgi-gru: remove always false condition

2015-09-21T02:27:59Z

The member gid in struct gru_dump_chiplet_state_req is unsigned int. So it can never be less than 0. Signed-off-by: Sudip Mukherjee Acked-by: Dimitri Sivanich Signed-off-by: Greg Kroah-Hartman

drivers/misc/sgi-gru: add return on error

2015-09-21T02:27:58Z

If the buffer is too small then return the error and in the process remove the variables which became unused. Signed-off-by: Sudip Mukherjee Acked-by: Dimitri Sivanich Signed-off-by: Greg Kroah-Hartman

drivers/misc/sgi-gru/grukdump.c: cleanup gru_dump_context() a little

2014-04-07T23:36:09Z

"ret" is zero here so we can remove the "!ret" part of the condition. "uhdr" is alread a __user pointer so we can remove the cast. Signed-off-by: Dan Carpenter Acked-by: Dimitri Sivanich Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

drivers/misc/sgi-gru/grukdump.c: unlocking should be conditional in gru_dump_context()

2014-02-11T00:01:39Z

I was reviewing this and noticed that unlocking should be conditional on the error path. I've changed it to unlock and return directly since we only do it once and it seems unlikely to change in the near future. Signed-off-by: Dan Carpenter Acked-by: Dimitri Sivanich Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gru: add debug option for cache flushing

2009-12-16T15:20:15Z

Add a debug option to the SGI GRU driver for flushing GRU cache lines from memory. In theory this is not needed but it is useful for debugging. This has no use by end users. Signed-off-by: Jack Steiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gru: copyright fixes

2009-06-18T20:04:04Z

Fix the copyright statements in a couple of GRU files. No functional changes are being made. Signed-off-by: Jack Steiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gru: fixes to grudump utility

2009-06-18T20:04:04Z

Minor fixes to the SGI GRU grudump facility: - fix address where user data is written - add gru number to data passed to user - indicate if context is locked Signed-off-by: Jack Steiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gru: change resource assignment for kernel threads

2009-06-18T20:04:00Z

Change the way GRU resources are assigned for kernel threads. GRU contexts for kernel threads are now allocated on demand and can be stolen by user processes when idle. This allows MPI jobs to use ALL of the GRU resources when the kernel is not using them. Signed-off-by: Jack Steiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds