Date: Thu, 25 Jun 2020 05:24:36 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r362605 - stable/12/sys/compat/linux Message-ID: <202006250524.05P5OaQg054727@repo.freebsd.org>
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Author: kib Date: Thu Jun 25 05:24:35 2020 New Revision: 362605 URL: https://svnweb.freebsd.org/changeset/base/362605 Log: MFC r362342: Fix execution of linux binary from multithreaded non-Linux process. Modified: stable/12/sys/compat/linux/linux_emul.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/compat/linux/linux_emul.c ============================================================================== --- stable/12/sys/compat/linux/linux_emul.c Thu Jun 25 05:20:00 2020 (r362604) +++ stable/12/sys/compat/linux/linux_emul.c Thu Jun 25 05:24:35 2020 (r362605) @@ -261,22 +261,13 @@ linux_common_execve(struct thread *td, struct image_ar void linux_proc_exec(void *arg __unused, struct proc *p, struct image_params *imgp) { - struct thread *td = curthread; + struct thread *td; struct thread *othertd; #if defined(__amd64__) struct linux_pemuldata *pem; #endif - /* - * In a case of execing from Linux binary properly detach - * other threads from the user space. - */ - if (__predict_false(SV_PROC_ABI(p) == SV_ABI_LINUX)) { - FOREACH_THREAD_IN_PROC(p, othertd) { - if (td != othertd) - (p->p_sysent->sv_thread_detach)(othertd); - } - } + td = curthread; /* * In a case of execing to Linux binary we create Linux @@ -284,11 +275,32 @@ linux_proc_exec(void *arg __unused, struct proc *p, st */ if (__predict_false((imgp->sysent->sv_flags & SV_ABI_MASK) == SV_ABI_LINUX)) { - - if (SV_PROC_ABI(p) == SV_ABI_LINUX) + if (SV_PROC_ABI(p) == SV_ABI_LINUX) { + /* + * Process already was under Linuxolator + * before exec. Update emuldata to reflect + * single-threaded cleaned state after exec. + */ linux_proc_init(td, NULL, 0); - else + } else { + /* + * We are switching the process to Linux emulator. + */ linux_proc_init(td, td, 0); + + /* + * Create a transient td_emuldata for all suspended + * threads, so that p->p_sysent->sv_thread_detach() == + * linux_thread_detach() can find expected but unused + * emuldata. + */ + FOREACH_THREAD_IN_PROC(td->td_proc, othertd) { + if (othertd != td) { + linux_proc_init(td, othertd, + LINUX_CLONE_THREAD); + } + } + } #if defined(__amd64__) /* * An IA32 executable which has executable stack will have the
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