[{"id":3682037,"web_url":"http://patchwork.ozlabs.org/comment/3682037/","msgid":"","list_archive_url":null,"date":"2026-04-24T13:39:22","subject":"Re: [PATCH] linux-user: Fix CLONE_PARENT_SETTID when using fork-like\n clone","submitter":{"id":5111,"url":"http://patchwork.ozlabs.org/api/people/5111/","name":"Peter Maydell","email":"peter.maydell@linaro.org"},"content":"On Fri, 24 Apr 2026 at 14:28, Helge Deller wrote:\n>\n> From: Helge Deller \n>\n> The CLONE_PARENT_SETTID option requires the implementation to store the\n> child thread ID at the location pointed to by parent_tid in the parent's\n> memory.\n>\n> Fix our implementation and move the code from the client side (where\n> fork returned 0), to the parent side and store the return value from the\n> fork call (which is the client TID) in the parent_tid pointer.\n>\n> Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3340\n> Signed-off-by: Helge Deller \n> ---\n> linux-user/syscall.c | 4 ++--\n> 1 file changed, 2 insertions(+), 2 deletions(-)\n>\n> diff --git a/linux-user/syscall.c b/linux-user/syscall.c\n> index d0390e04b4..910a4da0a6 100644\n> --- a/linux-user/syscall.c\n> +++ b/linux-user/syscall.c\n> @@ -7050,8 +7050,6 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,\n> the child process gets its own copy of the lock. */\n> if (flags & CLONE_CHILD_SETTID)\n> put_user_u32(sys_gettid(), child_tidptr);\n> - if (flags & CLONE_PARENT_SETTID)\n> - put_user_u32(sys_gettid(), parent_tidptr);\n> ts = get_task_state(cpu);\n> if (flags & CLONE_SETTLS)\n> cpu_set_tls (env, newtls);\n> @@ -7059,6 +7057,8 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,\n> ts->child_tidptr = child_tidptr;\n> } else {\n> cpu_clone_regs_parent(env, flags);\n> + if (flags & CLONE_PARENT_SETTID)\n> + put_user_u32(ret, parent_tidptr);\n> if (flags & CLONE_PIDFD) {\n> int pid_fd = 0;\n\nThe clone(2) manpage says that CLONE_PARENT_SETTID stores the\n*child* thread ID -- shouldn't we be storing child_tidptr here ?\n\nthanks\n-- PMM","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=ZB0KZQjE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Fri, 24 Apr 2026\n 06:39:34 -0700 (PDT)","MIME-Version":"1.0","References":"<20260424132824.27733-1-deller@kernel.org>","In-Reply-To":"<20260424132824.27733-1-deller@kernel.org>","From":"Peter Maydell ","Date":"Fri, 24 Apr 2026 14:39:22 +0100","X-Gm-Features":"AQROBzANEpHJyXAZ4stC0FAQiCxmf5jeMYEPReJBUkZMOHaYYZMSF8YznxLfn2k","Message-ID":"\n ","Subject":"Re: [PATCH] linux-user: Fix CLONE_PARENT_SETTID when using fork-like\n clone","To":"Helge Deller ","Cc":"qemu-devel@nongnu.org, Helge Deller ","Content-Type":"text/plain; charset=\"UTF-8\"","Received-SPF":"pass client-ip=2607:f8b0:4864:20::112e;\n envelope-from=peter.maydell@linaro.org; helo=mail-yw1-x112e.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3682059,"web_url":"http://patchwork.ozlabs.org/comment/3682059/","msgid":"<2e676b2c-073d-405f-9354-5b1a456fba83@gmx.de>","list_archive_url":null,"date":"2026-04-24T14:36:56","subject":"Re: [PATCH] linux-user: Fix CLONE_PARENT_SETTID when using fork-like\n clone","submitter":{"id":1115,"url":"http://patchwork.ozlabs.org/api/people/1115/","name":"Helge Deller","email":"deller@gmx.de"},"content":"Hi Peter,\n\nOn 4/24/26 15:39, Peter Maydell wrote:\n> On Fri, 24 Apr 2026 at 14:28, Helge Deller wrote:\n>>\n>> From: Helge Deller \n>>\n>> The CLONE_PARENT_SETTID option requires the implementation to store the\n>> child thread ID at the location pointed to by parent_tid in the parent's\n>> memory.\n>>\n>> Fix our implementation and move the code from the client side (where\n>> fork returned 0), to the parent side and store the return value from the\n>> fork call (which is the client TID) in the parent_tid pointer.\n>>\n>> Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3340\n>> Signed-off-by: Helge Deller \n>> ---\n>> linux-user/syscall.c | 4 ++--\n>> 1 file changed, 2 insertions(+), 2 deletions(-)\n>>\n>> diff --git a/linux-user/syscall.c b/linux-user/syscall.c\n>> index d0390e04b4..910a4da0a6 100644\n>> --- a/linux-user/syscall.c\n>> +++ b/linux-user/syscall.c\n>> @@ -7050,8 +7050,6 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,\n>> the child process gets its own copy of the lock. */\n>> if (flags & CLONE_CHILD_SETTID)\n>> put_user_u32(sys_gettid(), child_tidptr);\n>> - if (flags & CLONE_PARENT_SETTID)\n>> - put_user_u32(sys_gettid(), parent_tidptr);\n>> ts = get_task_state(cpu);\n>> if (flags & CLONE_SETTLS)\n>> cpu_set_tls (env, newtls);\n>> @@ -7059,6 +7057,8 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,\n>> ts->child_tidptr = child_tidptr;\n>> } else {\n>> cpu_clone_regs_parent(env, flags);\n>> + if (flags & CLONE_PARENT_SETTID)\n>> + put_user_u32(ret, parent_tidptr);\n>> if (flags & CLONE_PIDFD) {\n>> int pid_fd = 0;\n> \n> The clone(2) manpage says that CLONE_PARENT_SETTID stores the\n> *child* thread ID -- shouldn't we be storing child_tidptr here ?\nSorry, but I don't get your point.\nEven before we stored the TID of the child (sys_gettid())\nat the location \"parent_tidptr\". Now we still store the TID of the child (which\nis the one returned from the fork()) at \"paret_tidptr\".\nWhy are you mentioning child_tidptr?\n\nHelge","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=gmx.de header.i=deller@gmx.de header.a=rsa-sha256\n header.s=s31663417 header.b=NR+agAvJ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g2FtN03zzz1yD5\n\tfor ; Sat, 25 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","Cc":"qemu-devel@nongnu.org","References":"<20260424132824.27733-1-deller@kernel.org>\n ","Content-Language":"en-US","From":"Helge Deller ","Autocrypt":"addr=deller@gmx.de; keydata=\n xsFNBF3Ia3MBEAD3nmWzMgQByYAWnb9cNqspnkb2GLVKzhoH2QD4eRpyDLA/3smlClbeKkWT\n HLnjgkbPFDmcmCz5V0Wv1mKYRClAHPCIBIJgyICqqUZo2qGmKstUx3pFAiztlXBANpRECgwJ\n r+8w6mkccOM9GhoPU0vMaD/UVJcJQzvrxVHO8EHS36aUkjKd6cOpdVbCt3qx8cEhCmaFEO6u\n CL+k5AZQoABbFQEBocZE1/lSYzaHkcHrjn4cQjc3CffXnUVYwlo8EYOtAHgMDC39s9a7S90L\n 69l6G73lYBD/Br5lnDPlG6dKfGFZZpQ1h8/x+Qz366Ojfq9MuuRJg7ZQpe6foiOtqwKym/zV\n dVvSdOOc5sHSpfwu5+BVAAyBd6hw4NddlAQUjHSRs3zJ9OfrEx2d3mIfXZ7+pMhZ7qX0Axlq\n Lq+B5cfLpzkPAgKn11tfXFxP+hcPHIts0bnDz4EEp+HraW+oRCH2m57Y9zhcJTOJaLw4YpTY\n GRUlF076vZ2Hz/xMEvIJddRGId7UXZgH9a32NDf+BUjWEZvFt1wFSW1r7zb7oGCwZMy2LI/G\n aHQv/N0NeFMd28z+deyxd0k1CGefHJuJcOJDVtcE1rGQ43aDhWSpXvXKDj42vFD2We6uIo9D\n 1VNre2+uAxFzqqf026H6cH8hin9Vnx7p3uq3Dka/Y/qmRFnKVQARAQABzRxIZWxnZSBEZWxs\n 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BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3682083,"web_url":"http://patchwork.ozlabs.org/comment/3682083/","msgid":"","list_archive_url":null,"date":"2026-04-24T15:29:54","subject":"Re: [PATCH] linux-user: Fix CLONE_PARENT_SETTID when using fork-like\n clone","submitter":{"id":5111,"url":"http://patchwork.ozlabs.org/api/people/5111/","name":"Peter Maydell","email":"peter.maydell@linaro.org"},"content":"On Fri, 24 Apr 2026 at 15:36, Helge Deller wrote:\n>\n> Hi Peter,\n>\n> On 4/24/26 15:39, Peter Maydell wrote:\n> >> @@ -7059,6 +7057,8 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,\n> >> ts->child_tidptr = child_tidptr;\n> >> } else {\n> >> cpu_clone_regs_parent(env, flags);\n> >> + if (flags & CLONE_PARENT_SETTID)\n> >> + put_user_u32(ret, parent_tidptr);\n> >> if (flags & CLONE_PIDFD) {\n> >> int pid_fd = 0;\n> >\n> > The clone(2) manpage says that CLONE_PARENT_SETTID stores the\n> > *child* thread ID -- shouldn't we be storing child_tidptr here ?\n> Sorry, but I don't get your point.\n> Even before we stored the TID of the child (sys_gettid())\n> at the location \"parent_tidptr\". Now we still store the TID of the child (which\n> is the one returned from the fork()) at \"paret_tidptr\".\n> Why are you mentioning child_tidptr?\n\nI got confused about whether parent_tidptr was the value\nor the address in this put_user function, sorry. (I think\nmaybe my intuition is that it ought to be a (dest, src) order\nlike memcpy, but it isn't.)\n\nReviewed-by: Peter Maydell \n\n-- PMM","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=maVhBhZN;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g2H3j3cVbz1yDD\n\tfor ; Sat, 25 Apr 2026 01:30:55 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wGITs-0007wU-Cc; 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Fri, 24 Apr 2026\n 08:30:07 -0700 (PDT)","MIME-Version":"1.0","References":"<20260424132824.27733-1-deller@kernel.org>\n \n <2e676b2c-073d-405f-9354-5b1a456fba83@gmx.de>","In-Reply-To":"<2e676b2c-073d-405f-9354-5b1a456fba83@gmx.de>","From":"Peter Maydell ","Date":"Fri, 24 Apr 2026 16:29:54 +0100","X-Gm-Features":"AQROBzC4SBAuqg4Ge2S1BiEIY1Nsqjh1b8xM5LhnXs5BnqbmhA0sk_Qeb_wHHlc","Message-ID":"\n ","Subject":"Re: [PATCH] linux-user: Fix CLONE_PARENT_SETTID when using fork-like\n clone","To":"Helge Deller ","Cc":"Helge Deller , qemu-devel@nongnu.org","Content-Type":"text/plain; charset=\"UTF-8\"","Received-SPF":"pass client-ip=2607:f8b0:4864:20::b12c;\n envelope-from=peter.maydell@linaro.org; helo=mail-yx1-xb12c.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}}]