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51 lines
1.6 KiB
Diff
51 lines
1.6 KiB
Diff
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From 6f25b4e75a87fea8087b543f3d1298d301d24ad7 Mon Sep 17 00:00:00 2001
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From: Will Deacon <will.deacon@arm.com>
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Date: Thu, 16 Aug 2012 18:14:14 +0100
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Subject: tracing/syscalls: Fix perf syscall tracing when syscall_nr == -1
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commit 60916a9382e88fbf5e54fd36a3e658efd7ab7bed upstream.
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syscall_get_nr can return -1 in the case that the task is not executing
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a system call.
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This patch fixes perf_syscall_{enter,exit} to check that the syscall
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number is valid before using it as an index into a bitmap.
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Link: http://lkml.kernel.org/r/1345137254-7377-1-git-send-email-will.deacon@arm.com
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Cc: Jason Baron <jbaron@redhat.com>
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Cc: Wade Farnsworth <wade_farnsworth@mentor.com>
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Cc: Frederic Weisbecker <fweisbec@gmail.com>
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Signed-off-by: Will Deacon <will.deacon@arm.com>
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Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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kernel/trace/trace_syscalls.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
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index 7c75bbb..22a7c9b 100644
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--- a/kernel/trace/trace_syscalls.c
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+++ b/kernel/trace/trace_syscalls.c
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@@ -519,6 +519,8 @@ static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id)
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int size;
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syscall_nr = syscall_get_nr(current, regs);
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+ if (syscall_nr < 0)
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+ return;
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if (!test_bit(syscall_nr, enabled_perf_enter_syscalls))
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return;
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@@ -593,6 +595,8 @@ static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
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int size;
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syscall_nr = syscall_get_nr(current, regs);
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+ if (syscall_nr < 0)
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+ return;
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if (!test_bit(syscall_nr, enabled_perf_exit_syscalls))
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return;
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--
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cgit v1.1
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