From mboxrd@z Thu Jan 1 00:00:00 1970 From: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman) Subject: Re: [PATCH] user_ns: Add support for unprivileged remount Date: Thu, 17 Jan 2013 02:06:00 -0800 Message-ID: <87vcawf7jr.fsf@xmission.com> References: <50519CB2.7040801@gmail.com> <87fw6lfwc3.fsf@xmission.com> <5052F783.3040904@gmail.com> <877grxdk48.fsf@xmission.com> <50F7A59A.1080601@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <50F7A59A.1080601-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org> (Gao feng's message of "Thu, 17 Jan 2013 15:17:46 +0800") List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Gao feng Cc: Zhao Hongjiang , containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org List-Id: containers.vger.kernel.org R2FvIGZlbmcgPGdhb2ZlbmdAY24uZnVqaXRzdS5jb20+IHdyaXRlczoKCj4gT24gMjAxMi8wOS8x NCAxNzozMywgRXJpYyBXLiBCaWVkZXJtYW4gd3JvdGU6Cj4+IFpoYW8gSG9uZ2ppYW5nIDx6aGFv aG9uZ2ppYW5nMzdAZ21haWwuY29tPiB3cml0ZXM6Cj4+IAo+Pj4gT24gMjAxMi05LTE0IDU6MjYs IEVyaWMgVy4gQmllZGVybWFuIHdyb3RlOgo+Pj4+IFpoYW8gSG9uZ2ppYW5nIDx6aGFvaG9uZ2pp YW5nMzdAZ21haWwuY29tPiB3cml0ZXM6Cj4+Pj4KPj4+Pj4gRnJvbTogWmhhbyBIb25namlhbmcg PHpoYW9ob25namlhbmdAaHVhd2VpLmNvbT4KPj4+Pj4KPj4+Pj4gUmVsYXggdGhlIHBlcm1pc3Np b24gY2hlY2tzIHRvIGFsbG93IHVucHJpdmlsZWdlZCB1c2VycyB0aGF0IGhhdmUKPj4+Pj4gQ0FQ X1NZU19BRE1JTiBwZXJtaXNzaW9ucyBpbiB0aGUgdXNlciBuYW1lc3BhY2UgcmVmZXJyZWQgdG8g YnkgdGhlCj4+Pj4+IGN1cnJlbnQgbW91bnQgbmFtZXNwYWNlIHRvIGJlIGFsbG93ZWQgdG8gcmVt b3VudCBmaWxlc3lzdGVtcy4KPj4+Pgo+Pj4+IFJlbW91bnQgaW4gZ2VuZXJhbCBtYWtlIGZpbGVz eXN0ZW0gY29uZmlndXJhdGlvbiBjaGFuZ2VzIG5vdCBtb3VudCBsZXZlbAo+Pj4+IGNoYW5nZXMu Cj4+Pj4KPj4+PiBJbiBnZW5lcmFsIHJlbW91bnQgaXMgbm90IHNhZmUgZm9yIHVucHJpdmllbGdl ZCB1c2Vycy4KPj4+Pgo+Pj4+IERvIHlvdSBoYXZlIGEgdXNlIGNhc2Ugd2hlcmUgeW91IG5lZWQg dG8gcmVtb3VudCBhIGZpbGVzeXN0ZW0/Cj4+Pgo+Pj4gQXMgd2UgY2FuIGRvIGEgdW1vdW50K21v dW5077yMSSBkb24ndCBzZWUgd2h5IHJlbW91bnQgb3BlcmF0aW9uIGlzIG5vdCBhbGxvd2VkLgo+ Pj4gU2hvdWxkbid0IHdlIGFkZCBjaGVja3MgaW4gcmVtb3VudCBwYXRoIGluIHRoZSBzcGVjaWZp YyBmaWxlc3lzdGVtIHRvIGVuc3VyZQo+Pj4gc2FmZXR5IGluc3RlYWQgd2hlbiB3ZSBlbmFibGUg dW5wcml2aWxsZWdlZCBtb3VudD8KPj4gCj4+IEJ1dCB0aGUgdGhpbmcgaXMgcmVtb3VudCAhPSBt b3VudCt1bW91bnQuICBSZW1vdW50IGlzIGNoYW5nZSBsb3dsZXZlbAo+PiBmaWxlc3lzdGVtIG9w dGlvbnMuCj4+IAo+PiBUaGUgYmFzaWMgZGFuZ2VyIGlzIGlmIHNvbWVvbmUgaW4gdGhlIHByaW1h cnkgdXNlciBuYW1lc3BhY2UgbW91bnRlZCBhCj4+IGZpbGVzeXN0ZW0sIGFuZCB0aGVuIHdlIGNs b25lZCB0aGF0IGZpbGVzeXN0ZW0uCj4+IAo+PiB1bW91bnRpbmcgZmlsZXN5c3RlbXMgaXMgb2su ICBUaGVyZSByZWZlcmVuY2UgY291bnQgd2lsbCBkcm9wIG9yIHRoZXkKPj4gd2lsbCBqdXN0IHVu bW91bnQgaWYgdGhlIHJlZiBjb3VudCBnb2VzIHRvIHplcm8uCj4+IAo+PiBIb3dldmVyIG1vdW50 IC1vIHJlbW91bnQgLXIgL2hvbWUgY291bGQgdmVyeSBlYXNpbHkgcmVtb3VudCBldmVyeW9uZSdz Cj4+IGhvbWUgZGlyZWN0b3J5IGluIGFsbCBtb3VudCBuYW1lc3BhY2VzIHJlYWQtb25seSBieSBt YWtpbmcgdGhlCj4+IGZpbGVzeXN0ZW0gaXRzZWxmIHJlYWRvbmx5Lgo+PiAKPj4gVGhhdCBkYW5n ZXIgYXBwbGllcyBldmVuIHRvIHNvbWUgZXh0ZW50IGV2ZW4gaWYgdGhlIG9wdGlvbnMgYXJlIHNh ZmUgZm9yCj4+IHVzIHRvIHBlcmZvcm0gYXQgdGhlIGZpbGVzeXN0ZW0gbGV2ZWwuCj4+IAo+PiBO b3cgdGhhdCBkb2Vzbid0IG1lYW4gcmVtb3VudCBpcyBhIGhvcGVsZXNzIG9wZXJhdGlvbi4gIFdo YXQgaXQgZG9lcwo+PiBtZWFuIGlzIHRoYXQgd2UgbmVlZCB0byBiZSB2ZXJ5IGNhcmVmdWxseSB3 aXRoIGVuYWJsaW5nIHJlbW91bnRpbmcKPj4gb2YgYSBmaWxlc3lzdGVtLgo+PiAKPiBIaSBFcmlj Cj4KPiB3aGF0J3MgeW91IGlkZWEgYWJvdXQgdGhlIHBhdGNoIGJlbG93Lgo+IE1heWJlIGl0IGJl dHRlciB0byBhZGQgYSBuZXcgZnNfZmxhZ3MgRlNfVVNFUk5TX1JFTU9VTlQ/Cj4gSXQncyBub3Qg YSBnb29kIGV4cGVyaWVuY2UgdGhhdCByZW1vdW50IGlzIGRpc2FibGVkIGluIGNvbnRhaW5lci4K CkkgdGhpbmsgeW91IHRvdGFsbHkgZGlkIG5vdCByZWFkIGFuZCB1bmRlcnN0YW5kIHdoYXQgSSBz YWlkIGFib3ZlLAphbmQgeW91ciBwYXRjaCBkZXNjcmlwdGlvbiBpcyB3cm9uZy4KClJlbW91bnRp bmcgcHJvYyBpcyBub3Qgc2FmZSwgbWFraW5nIHRoZSBwYXRjaCBiZWxvdyBpcyBicm9rZW4uICBS ZWFkCnByb2MgYW5kIHJlYWQgbXkgY29tbWVudHMgYWJvdmUuCgpUaGlua2luZyB0aGF0IHRoaXMg bWlnaHQgYmUgYW4gaXNzdWUgdGhhdCBjYW4gYmUgZml4ZWQgd2l0aCBmc19mbGFncyBpcwp0aGlu a2luZyBhYm91dCB0aGlzIHdyb25nLiAgVGhpbmtpbmcgYSByZW1vdW50IGluIGFueSB3YXkgd291 bGQgYmUKaXNvbGF0ZWQgdG8gYSBzaW5nbGUgbW91bnQgbmFtZXNwYWNlcyBpcyB3cm9uZy4gIFdo ZW4gaW1wbGVtZW50aW5nCnJlbW91bnQgeW91IGhhdmUgdG8gdGhpbmsgYWJvdXQgZXZlcnlvbmUg d2hvIGhhcyBhY2Nlc3MgdG8gdGhhdApmaWxlc3lzdGVtLCBhbmQgaXMgaXMgbGVnaXRpbWF0ZSBm b3IgeW91IHRvIGFmZmVjdCBhbGwgb2YgdGhlbS4KCldoYXQgYXJlIHBlb3BsZSBkb2luZyB3aXRo IHJlbW91bnRpbmc/ICBXaHkgZG8gd2Ugd2FudCBpdD8gIEFzIGEKcHJhY3RpY2FsIG1hdHRlciwg YXNzdW1lIHRoYXQgaXQgaXMgaW1wb3NzaWJsZSB0byByZXN1ZSB0aGUgY3VycmVudApmaWxlc3lz dGVtIGxldmVsIGltcGxlbWVudGF0aW9uIG9mIHJlbW91bnQuCgpBcyBJIHNhaWQgYWJvdmUgSSBk b24ndCBldmVuIHRoaW5rIG1vdW50IC1vIHJlbW91bnQgLXIgL3NvbWUvZmlsZXN5c3RlbQppcyBz YWZlLiAgVGhpbmsgd2hhdCB3b3VsZCBoYXBwZW4gaWYgeW91IHJ1biB0aGUgc2hlbGwgc2NyaXB0 IGJlbG93IHdpdGgKL3RtcCBiZWluZyBhIHNlcGFyYXRlIHRtcGZzIG1vdW50IHBvaW50IGFuZCAv cHJvYyBiZWluZyBwcm9jZnMuCgotLS0KIyEvYmluL3NoCmV4cG9ydCBJRklGTz0vdG1wL3BpZG5z LXRlc3QtJCQtaW4KZXhwb3J0IE9GSUZPPS90bXAvcGlkbnMtdGVzdC0kJC1vdXQKcm0gLWYgJElG SUZPICRPRklGTwpta2ZpZm8gJElGSUZPCm1rZmlmbyAkT0ZJRk8KdW5zaGFyZSAtLXVzZXIgLS0g L2Jpbi9iYXNoIC1zIDw8J0VPRicgJgplY2hvIHdhaXRpbmctZm9yLXVpZC1hbmQtZ2lkLW1hcHMg PiAkT0ZJRk8KcmVhZCBMSU5FIDwgJElGSUZPCmV4ZWMgdW5zaGFyZSAtLW1vdW50IC0tIC9iaW4v YmFzaCAtcyA8PCdFT0YyJwoKbW91bnQgLW4gLW8gcmVtb3VudCAtcm8gL3RtcAptb3VudCAtbiAt byByZW1vdW50IC9wcm9jIGhpZHBpZGU9MgoKRU9GMgpFT0YKY2hpbGQ9JCEKcmVhZCBMSU5FIDwg JE9GSUZPCnVpZD0kKGlkIC0tdXNlcikKZ2lkPSQoaWQgLS1ncm91cCkKZWNobyAiMCAkdWlkIDEi ID4gL3Byb2MvJGNoaWxkL3VpZF9tYXAKZWNobyAiMCAkZ2lkIDEiID4gL3Byb2MvJGNoaWxkL2dp ZF9tYXAKZWNobyB1aWQtYW5kLWdpZC1tYXBzID4gJElGSUZPCndhaXQgJGNoaWxkCi0tLQoKPiBU aGFua3MhCj4KPiBGcm9tIDhjNWEwMWMwMDdkNzJjNzQ4MDE4NjY1ZDNiZDI3Y2QyYmRlNTJjMGYg TW9uIFNlcCAxNyAwMDowMDowMCAyMDAxCj4gRnJvbTogR2FvIGZlbmcgPGdhb2ZlbmdAY24uZnVq aXRzdS5jb20+Cj4gRGF0ZTogVGh1LCAxNyBKYW4gMjAxMyAxNDo0MTowMCArMDgwMAo+IFN1Ympl Y3Q6IFtQQVRDSF0gdXNlcm5zOiBhbGxvdyByZW1vdW50IGZpbGVzeXN0ZW0gaW4gdW4taW5pdCB1 c2VybnMKPgo+IFRoZSBwcm9jIGFuZCBzeXNmcyBmaWxlc3lzdGVtIGFscmVhZHkgZW5hYmxlIHVz ZXJucyBzdXBwb3J0LAo+IHJlbW91bnRpbmcgdGhlc2UgZmlsZXN5c3RlbXMgaW4gdW4taW5pdCB1 c2VybnMgZG8gbm8gaGFybQo+IHRvIHRoZSBob3N0Lgo+Cj4gU2lnbmVkLW9mZi1ieTogR2FvIGZl bmcgPGdhb2ZlbmdAY24uZnVqaXRzdS5jb20+Cj4gLS0tCj4gIGZzL25hbWVzcGFjZS5jIHwgNSAr KysrLQo+ICAxIGZpbGUgY2hhbmdlZCwgNCBpbnNlcnRpb25zKCspLCAxIGRlbGV0aW9uKC0pCj4K PiBkaWZmIC0tZ2l0IGEvZnMvbmFtZXNwYWNlLmMgYi9mcy9uYW1lc3BhY2UuYwo+IGluZGV4IDU1 NjA1YzUuLmI5ZDgzZmIgMTAwNjQ0Cj4gLS0tIGEvZnMvbmFtZXNwYWNlLmMKPiArKysgYi9mcy9u YW1lc3BhY2UuYwo+IEBAIC0xNzQ4LDcgKzE3NDgsMTAgQEAgc3RhdGljIGludCBkb19yZW1vdW50 KHN0cnVjdCBwYXRoICpwYXRoLCBpbnQgZmxhZ3MsIGludCBtbnRfZmxhZ3MsCj4gIAlzdHJ1Y3Qg c3VwZXJfYmxvY2sgKnNiID0gcGF0aC0+bW50LT5tbnRfc2I7Cj4gIAlzdHJ1Y3QgbW91bnQgKm1u dCA9IHJlYWxfbW91bnQocGF0aC0+bW50KTsKPiAgCj4gLQlpZiAoIWNhcGFibGUoQ0FQX1NZU19B RE1JTikpCj4gKwlpZiAoc2ItPnNfdHlwZS0+ZnNfZmxhZ3MgJiBGU19VU0VSTlNfTU9VTlQpIHsK PiArCQlpZiAoIW5zX2NhcGFibGUobW50LT5tbnRfbnMtPnVzZXJfbnMsIENBUF9TWVNfQURNSU4p KQo+ICsJCQlyZXR1cm4gLUVQRVJNOwo+ICsJfSBlbHNlIGlmICghY2FwYWJsZShDQVBfU1lTX0FE TUlOKSkKPiAgCQlyZXR1cm4gLUVQRVJNOwo+ICAKPiAgCWlmICghY2hlY2tfbW50KG1udCkpCl9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCkNvbnRhaW5lcnMg bWFpbGluZyBsaXN0CkNvbnRhaW5lcnNAbGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6 Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4vbGlzdGluZm8vY29udGFpbmVycw==