From: tip-bot for Yabin Cui <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: torvalds@linux-foundation.org, hpa@zytor.com,
stable@vger.kernel.org, yabinc@google.com, peterz@infradead.org,
linux-kernel@vger.kernel.org, namhyung@kernel.org,
tglx@linutronix.de, jolsa@redhat.com,
alexander.shishkin@linux.intel.com, mingo@kernel.org,
acme@kernel.org
Subject: [tip:perf/urgent] perf/core: Force USER_DS when recording user stack data
Date: Mon, 10 Sep 2018 05:39:39 -0700 [thread overview]
Message-ID: <tip-02e184476eff848273826c1d6617bb37e5bcc7ad@git.kernel.org> (raw)
In-Reply-To: <20180823225935.27035-1-yabinc@google.com>
Commit-ID: 02e184476eff848273826c1d6617bb37e5bcc7ad
Gitweb: https://git.kernel.org/tip/02e184476eff848273826c1d6617bb37e5bcc7ad
Author: Yabin Cui <yabinc@google.com>
AuthorDate: Thu, 23 Aug 2018 15:59:35 -0700
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 10 Sep 2018 14:01:46 +0200
perf/core: Force USER_DS when recording user stack data
Perf can record user stack data in response to a synchronous request, such
as a tracepoint firing. If this happens under set_fs(KERNEL_DS), then we
end up reading user stack data using __copy_from_user_inatomic() under
set_fs(KERNEL_DS). I think this conflicts with the intention of using
set_fs(KERNEL_DS). And it is explicitly forbidden by hardware on ARM64
when both CONFIG_ARM64_UAO and CONFIG_ARM64_PAN are used.
So fix this by forcing USER_DS when recording user stack data.
Signed-off-by: Yabin Cui <yabinc@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <stable@vger.kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 88b0193d9418 ("perf/callchain: Force USER_DS when invoking perf_callchain_user()")
Link: http://lkml.kernel.org/r/20180823225935.27035-1-yabinc@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/events/core.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index abaed4f8bb7f..c80549bf82c6 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5943,6 +5943,7 @@ perf_output_sample_ustack(struct perf_output_handle *handle, u64 dump_size,
unsigned long sp;
unsigned int rem;
u64 dyn_size;
+ mm_segment_t fs;
/*
* We dump:
@@ -5960,7 +5961,10 @@ perf_output_sample_ustack(struct perf_output_handle *handle, u64 dump_size,
/* Data. */
sp = perf_user_stack_pointer(regs);
+ fs = get_fs();
+ set_fs(USER_DS);
rem = __output_copy_user(handle, (void *) sp, dump_size);
+ set_fs(fs);
dyn_size = dump_size - rem;
perf_output_skip(handle, rem);
prev parent reply other threads:[~2018-09-10 12:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-23 22:59 [PATCH] perf: Force USER_DS when recording user stack data Yabin Cui
2018-08-24 8:56 ` Peter Zijlstra
2018-09-10 12:39 ` tip-bot for Yabin Cui [this message]
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