[lkml]   [2019]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[GIT pull] smp fixes for 5.2

please pull the latest smp-urgent-for-linus git tree from:

git:// smp-urgent-for-linus

up to: 33d4a5a7a5b4: cpu/hotplug: Fix out-of-bounds read when setting fail state

Two small changes for the cpu hotplug code:

- Prevent out of bounds access which actually might crash the machine
caused by a missing bounds check in the fail injection code

- Warn about unsupported migitation mode command line arguments to make
people aware that they typoed the paramater. Not necessarily a fix
but quite some people tripped over that.



Eiichi Tsukata (1):
cpu/hotplug: Fix out-of-bounds read when setting fail state

Geert Uytterhoeven (1):
cpu/speculation: Warn on unsupported mitigations= parameter

kernel/cpu.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 077fde6fb953..ef1c565edc5d 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1964,6 +1964,9 @@ static ssize_t write_cpuhp_fail(struct device *dev,
if (ret)
return ret;

+ if (fail < CPUHP_OFFLINE || fail > CPUHP_ONLINE)
+ return -EINVAL;
* Cannot fail STARTING/DYING callbacks.
@@ -2339,6 +2342,9 @@ static int __init mitigations_parse_cmdline(char *arg)
cpu_mitigations = CPU_MITIGATIONS_AUTO;
else if (!strcmp(arg, "auto,nosmt"))
+ else
+ pr_crit("Unsupported mitigations=%s, system may still be vulnerable\n",
+ arg);

return 0;
 \ /
  Last update: 2019-06-29 17:13    [W:0.059 / U:1.584 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site