Messages in this thread Patch in this message | | | Date | Sat, 29 Jun 2019 21:45:35 +0200 | From | Ingo Molnar <> | Subject | [GIT PULL] smp/urgent fixes |
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Linus,
Please pull the latest smp-urgent-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git smp-urgent-for-linus
# HEAD: 33d4a5a7a5b4d02915d765064b2319e90a11cbde cpu/hotplug: Fix out-of-bounds read when setting fail state
Two fixes:
- Fix an out of bounds access when writing nonsensical values to /sys/devices/system/cpu/cpuX/hotplug/fail
- Warn about unsupported mitigations= parameters.
Thanks,
Ingo
------------------> 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")) cpu_mitigations = CPU_MITIGATIONS_AUTO_NOSMT; + else + pr_crit("Unsupported mitigations=%s, system may still be vulnerable\n", + arg); return 0; }
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