From: Paolo Bonzini <pbonzini@redhat.com>
To: Shannon Zhao <zhaoshenglong@huawei.com>, qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, hangaohuai@huawei.com,
qemu-trivial@nongnu.org, mjt@tls.msk.ru,
peter.huangpeng@huawei.com, aneesh.kumar@linux.vnet.ibm.com,
shannon.zhao@linaro.org
Subject: Re: [Qemu-trivial] [PATCH] hw/9pfs/virtio-9p-proxy: Fix possible overflow
Date: Fri, 13 Mar 2015 13:50:46 +0100 [thread overview]
Message-ID: <5502DD26.6070401@redhat.com> (raw)
In-Reply-To: <1426244956-5316-1-git-send-email-zhaoshenglong@huawei.com>
On 13/03/2015 12:09, Shannon Zhao wrote:
> + g_assert(strlen(path) < sizeof(helper.sun_path));
Ok.
> sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
> if (sockfd < 0) {
> fprintf(stderr, "failed to create socket: %s\n", strerror(errno));
> return -1;
> }
> - strcpy(helper.sun_path, path);
> + strncpy(helper.sun_path, path, sizeof(helper.sun_path));
strcpy is okay here. strncpy makes people think of what happens if
strlen(path) == sizeof(helper.sun_path). While this cannot happen here
because of the assertion, the function should still be used with care.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Shannon Zhao <zhaoshenglong@huawei.com>, qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, hangaohuai@huawei.com,
qemu-trivial@nongnu.org, mjt@tls.msk.ru,
peter.huangpeng@huawei.com, aneesh.kumar@linux.vnet.ibm.com,
shannon.zhao@linaro.org
Subject: Re: [Qemu-devel] [PATCH] hw/9pfs/virtio-9p-proxy: Fix possible overflow
Date: Fri, 13 Mar 2015 13:50:46 +0100 [thread overview]
Message-ID: <5502DD26.6070401@redhat.com> (raw)
In-Reply-To: <1426244956-5316-1-git-send-email-zhaoshenglong@huawei.com>
On 13/03/2015 12:09, Shannon Zhao wrote:
> + g_assert(strlen(path) < sizeof(helper.sun_path));
Ok.
> sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
> if (sockfd < 0) {
> fprintf(stderr, "failed to create socket: %s\n", strerror(errno));
> return -1;
> }
> - strcpy(helper.sun_path, path);
> + strncpy(helper.sun_path, path, sizeof(helper.sun_path));
strcpy is okay here. strncpy makes people think of what happens if
strlen(path) == sizeof(helper.sun_path). While this cannot happen here
because of the assertion, the function should still be used with care.
Paolo
next prev parent reply other threads:[~2015-03-13 12:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-13 11:09 [Qemu-trivial] [PATCH] hw/9pfs/virtio-9p-proxy: Fix possible overflow Shannon Zhao
2015-03-13 11:09 ` [Qemu-devel] " Shannon Zhao
2015-03-13 12:50 ` Paolo Bonzini [this message]
2015-03-13 12:50 ` Paolo Bonzini
2015-03-14 1:19 ` [Qemu-trivial] " Shannon Zhao
2015-03-14 1:19 ` [Qemu-devel] " Shannon Zhao
2015-03-16 7:58 ` [Qemu-trivial] " Aneesh Kumar K.V
2015-03-16 7:58 ` [Qemu-devel] " Aneesh Kumar K.V
2015-03-16 9:30 ` [Qemu-trivial] " Shannon Zhao
2015-03-16 9:30 ` [Qemu-devel] " Shannon Zhao
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