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From 35e080ae319d25c1df82855cda3a1bb014e90ba6 Mon Sep 17 00:00:00 2001
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From: "Dmitry V. Levin" <ldv@altlinux.org>
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Date: Wed, 8 Jan 2020 00:41:58 +0000
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Subject: [PATCH] syscall: do not capture stack trace while the tracee executes
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strace code
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* syscall.c (syscall_entering_trace) [ENABLE_STACKTRACE]: Do not capture
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stack trace when TCB_CHECK_EXEC_SYSCALL flag is set.
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---
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syscall.c | 9 +++++----
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1 file changed, 5 insertions(+), 4 deletions(-)
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diff --git a/syscall.c b/syscall.c
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index fadd3b5..a8fb4f1 100644
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--- a/syscall.c
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+++ b/syscall.c
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@@ -620,7 +620,7 @@ syscall_entering_trace(struct tcb *tcp, unsigned int *sig)
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if (hide_log(tcp)) {
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/*
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* Restrain from fault injection
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- * while the trace executes strace code.
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+ * while the tracee executes strace code.
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*/
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tcp->qual_flg &= ~QUAL_INJECT;
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@@ -655,9 +655,10 @@ syscall_entering_trace(struct tcb *tcp, unsigned int *sig)
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}
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#ifdef ENABLE_STACKTRACE
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- if (stack_trace_enabled) {
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- if (tcp_sysent(tcp)->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
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- unwind_tcb_capture(tcp);
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+ if (stack_trace_enabled &&
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+ !check_exec_syscall(tcp) &&
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+ tcp_sysent(tcp)->sys_flags & STACKTRACE_CAPTURE_ON_ENTER) {
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+ unwind_tcb_capture(tcp);
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}
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#endif
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--
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2.1.4
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