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[2001:470:27:1fa::2]) by smtp.gmail.com with ESMTPSA id f9-v6sm4122043ljf.9.2018.09.04.14.00.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 04 Sep 2018 14:00:46 -0700 (PDT) From: Max Filippov To: qemu-devel@nongnu.org Date: Tue, 4 Sep 2018 14:00:36 -0700 Message-Id: <20180904210036.7317-1-jcmvbkbc@gmail.com> X-Mailer: git-send-email 2.11.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::143 Subject: [Qemu-devel] [PATCH] linux-user: do setrlimit selectively X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Laurent Vivier , Max Filippov Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" When running 32-bit guest on 64-bit host setrlimit guest calls that affect memory resources (RLIMIT_{AS,DATA,STACK}) don't always make sense as is. They may result in QEMU lockup because mprotect call in page_unprotect would fail with ENOMEM error code, causing infinite loop of SIGSEGV. E.g. it happens when running libstdc++ testsuite for xtensa target on x86_64 host. Don't call host setrlimit for memory-related resources when running 32-bit guest on 64-bit host. Signed-off-by: Max Filippov --- linux-user/syscall.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 850b72a0c760..693a6c8aa7bb 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -9272,7 +9272,14 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, rlim.rlim_cur = target_to_host_rlim(target_rlim->rlim_cur); rlim.rlim_max = target_to_host_rlim(target_rlim->rlim_max); unlock_user_struct(target_rlim, arg2, 0); - return get_errno(setrlimit(resource, &rlim)); + if (HOST_LONG_BITS <= TARGET_LONG_BITS || + (resource != RLIMIT_DATA && + resource != RLIMIT_AS && + resource != RLIMIT_STACK)) { + return get_errno(setrlimit(resource, &rlim)); + } else { + return 0; + } } #endif #ifdef TARGET_NR_getrlimit