Messages in this thread Patch in this message | | | Date | Tue, 10 May 2016 13:43:42 +0200 | From | Ingo Molnar <> | Subject | [GIT PULL] perf fix |
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Linus,
Please pull the latest perf-urgent-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-urgent-for-linus
# HEAD: 93193230f7b8bd484d1749f4044d1214d521c804 perf/core: Change the default paranoia level to 2
Bump up the default perf paranoia level to 2 because otherwise perf can be used by local users to defeat KASLR, amongst other things.
Thanks,
Ingo
------------------> Andy Lutomirski (1): perf/core: Change the default paranoia level to 2
Documentation/sysctl/kernel.txt | 2 +- kernel/events/core.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 57653a44b128..fcddfd5ded99 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -645,7 +645,7 @@ allowed to execute. perf_event_paranoid: Controls use of the performance events system by unprivileged -users (without CAP_SYS_ADMIN). The default value is 1. +users (without CAP_SYS_ADMIN). The default value is 2. -1: Allow use of (almost) all events by all users >=0: Disallow raw tracepoint access by users without CAP_IOC_LOCK diff --git a/kernel/events/core.c b/kernel/events/core.c index 4e2ebf6f2f1f..c0ded2416615 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -351,7 +351,7 @@ static struct srcu_struct pmus_srcu; * 1 - disallow cpu events for unpriv * 2 - disallow kernel profiling for unpriv */ -int sysctl_perf_event_paranoid __read_mostly = 1; +int sysctl_perf_event_paranoid __read_mostly = 2; /* Minimum for 512 kiB + 1 user control page */ int sysctl_perf_event_mlock __read_mostly = 512 + (PAGE_SIZE / 1024); /* 'free' kiB per user */
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