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X-Received-From: 2607:f8b0:4864:20::341 X-Content-Filtered-By: Mailman/MimeDel 2.1.23 Subject: Re: [Qemu-devel] [qemu-s390x] linux-user: s390x issue on Fedora 30 (dynamic library loader?) X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Cornelia Huck , Riku Voipio , Richard Henderson , "qemu-devel@nongnu.org" , Laurent Vivier , qemu-s390x Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --000000000000d25f4e05907866f1 Content-Type: text/plain; charset="UTF-8" Hi, David. I can't repro the problem either, but I do have a patch authored by an engineer that left the company a while ago that seems to be at least related to your scenario. May I ask you to test it (just apply it to QEMU ToT and rerun the scenario to see if it changes the outcome) (feel free to experiment and modify the changes)? I never managed to understand the purpose of that patch (I lost the contact with the former engineer, and the patch is without any comment), so I never dared to send it to the list, but I hope your scenario may actually explain the purpose and the origin of the patch. I am attaching the patch both as a file and inline. Yours, Aleksandar >From 377f99e807f4aa42ece9f0cd437f50af11611b4c Mon Sep 17 00:00:00 2001 From: Aleksandar Markovic Date: Mon, 19 Aug 2019 15:20:29 +0200 Subject: [PATCH] linux-user: Special case /etc/ld.cache.so and pretend it does not exist Prevent target executables from opening host ld.so.cache. --- linux-user/syscall.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 8367cb1..f5bae6e 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8820,6 +8820,10 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, if (!(p = lock_user_string(arg1))) { return -TARGET_EFAULT; } + if (strcmp("/etc/ld.so.cache", path(p)) == 0) { + unlock_user(p, arg1, 0); + return -TARGET_ENONET; + } ret = get_errno(statfs(path(p), &stfs)); unlock_user(p, arg1, 0); convert_statfs: @@ -8859,6 +8863,10 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, if (!(p = lock_user_string(arg1))) { return -TARGET_EFAULT; } + if (strcmp("/etc/ld.so.cache", path(p)) == 0) { + unlock_user(p, arg1, 0); + return -TARGET_ENONET; + } ret = get_errno(statfs(path(p), &stfs)); unlock_user(p, arg1, 0); convert_statfs64: @@ -9059,6 +9067,10 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, if (!(p = lock_user_string(arg1))) { return -TARGET_EFAULT; } + if (strcmp("/etc/ld.so.cache", path(p)) == 0) { + unlock_user(p, arg1, 0); + return -TARGET_ENONET; + } ret = get_errno(stat(path(p), &st)); unlock_user(p, arg1, 0); goto do_stat; @@ -9068,6 +9080,10 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, if (!(p = lock_user_string(arg1))) { return -TARGET_EFAULT; } + if (strcmp("/etc/ld.so.cache", path(p)) == 0) { + unlock_user(p, arg1, 0); + return -TARGET_ENONET; + } ret = get_errno(lstat(path(p), &st)); unlock_user(p, arg1, 0); goto do_stat; @@ -10268,6 +10284,10 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, if (!(p = lock_user_string(arg1))) { return -TARGET_EFAULT; } + if (strcmp("/etc/ld.so.cache", path(p)) == 0) { + unlock_user(p, arg1, 0); + return -TARGET_ENONET; + } ret = get_errno(stat(path(p), &st)); unlock_user(p, arg1, 0); if (!is_error(ret)) @@ -10279,6 +10299,10 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, if (!(p = lock_user_string(arg1))) { return -TARGET_EFAULT; } + if (strcmp("/etc/ld.so.cache", path(p)) == 0) { + unlock_user(p, arg1, 0); + return -TARGET_ENONET; + } ret = get_errno(lstat(path(p), &st)); unlock_user(p, arg1, 0); if (!is_error(ret)) @@ -10319,6 +10343,10 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, if (p == NULL) { return -TARGET_EFAULT; } + if (strcmp("/etc/ld.so.cache", path(p)) == 0) { + unlock_user(p, arg1, 0); + return -TARGET_ENONET; + } #if defined(__NR_statx) { /* -- 2.7.4 On Mon, Aug 19, 2019 at 3:08 PM David Hildenbrand wrote: > On 19.08.19 14:11, Peter Maydell wrote: > > On Sat, 17 Aug 2019 at 17:14, David Hildenbrand > wrote: > >> > >> On 17.08.19 17:59, David Hildenbrand wrote: > >>> Hi everybody, > >>> > >>> I was just trying to run qemu-s390x (linux-user) with a very simple > >>> binary (gzip + lib/ld64.so.1, compiled under Fedora 27). This used to > >>> work just fine a while ago (especially when I was working on vector > >>> instructions using QEMU v3.1). However, now I can't get past a SEGFAULT > >>> in the dynamic library loader (I assume it is trying to locate glibc). > I > >>> tried a couple of other binaries that definitely used to work (from > >>> Fedora 30). > >>> > >>> I checked QEMU v4.1, v4.0 and v3.1. All are broken for me. Which is > >>> weird - because it used to work :/ > >>> > >>> I remember that I was running Fedora 29 the last time I had it running, > >>> so my gut feeling is that this is related to some other system library > >>> (but which?). I am running on an up-to-date Fedora 30 x86-64 now. > >>> > >>> Any ideas? Has this been reported already? (not sure if this is a > Fedora > >>> 30 issue) > > > > I'm pretty sure the problem you've run into is a long standing > > bug in the glibc dynamic loader. It cannot cope with the ld.so.cache > > being for the wrong endianness. (Correct endianness but incorrect > > architecture it correctly detects and ignores). The result is that > > running a linux-user QEMU dynamic binary for big-endian on little-endian > > like this will crash in the dynamic loader unless you arrange that it > can't > > find the host's ld.so.cache somehow, eg: > > (a) run inside a chroot > > (b) create an empty /etc/ld.so.cache file inside the -L directory > > > > The ideal fix would be if somebody cared enough to track down > > and fix the ld.so bug. > > > > Compare: > > https://bugs.launchpad.net/qemu/+bug/1701798 > > https://bugs.launchpad.net/qemu/+bug/1835693 > > > > thanks > > -- PMM > > > > Thanks, running > > "ldconfig -c etc/ld.so.cache -r ." > > Seems to fix the issue for me. So you are sure the bug resides in glic > and not in the qemu-user pieces of the library loader? > > -- > > Thanks, > > David / dhildenb > > --000000000000d25f4e05907866f1 Content-Type: text/x-patch; charset="US-ASCII"; name="0001-linux-user-Special-case-etc-ld.cache.so-and-pretend-.patch" Content-Disposition: attachment; filename="0001-linux-user-Special-case-etc-ld.cache.so-and-pretend-.patch" Content-Transfer-Encoding: base64 Content-ID: X-Attachment-Id: f_jzifmpf40 RnJvbSAzNzdmOTllODA3ZjRhYTQyZWNlOWYwY2Q0MzdmNTBhZjExNjExYjRjIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBBbGVrc2FuZGFyIE1hcmtvdmljIDxhbWFya292aWNAd2F2ZWNv bXAuY29tPgpEYXRlOiBNb24sIDE5IEF1ZyAyMDE5IDE1OjIwOjI5ICswMjAwClN1YmplY3Q6IFtQ QVRDSF0gbGludXgtdXNlcjogU3BlY2lhbCBjYXNlIC9ldGMvbGQuY2FjaGUuc28gYW5kIHByZXRl bmQgaXQgZG9lcwogbm90IGV4aXN0CgpQcmV2ZW50IHRhcmdldCBleGVjdXRhYmxlcyBmcm9tIG9w ZW5pbmcgaG9zdCBsZC5zby5jYWNoZS4KLS0tCiBsaW51eC11c2VyL3N5c2NhbGwuYyB8IDI4ICsr 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