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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=212.227.15.15; envelope-from=deller@gmx.de; helo=mout.gmx.net X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmx.de) X-ZM-MESSAGEID: 1669720135324100001 Content-Type: text/plain; charset="utf-8" Add emulation for the CLONE_PIDFD flag of the clone() syscall. This flag was added in Linux kernel 5.2. Successfully tested on a x86-64 Linux host with hppa-linux target. Can be verified by running the testsuite of the qcoro debian package, which breaks hard and kills the currently logged-in user without this patch. Signed-off-by: Helge Deller diff --git a/linux-user/strace.c b/linux-user/strace.c index 9ae5a812cd..8fa5c1ec3d 100644 Reviewed-by: Laurent Vivier --- a/linux-user/strace.c +++ b/linux-user/strace.c @@ -1097,6 +1097,7 @@ UNUSED static struct flags clone_flags[] =3D { FLAG_GENERIC(CLONE_FS), FLAG_GENERIC(CLONE_FILES), FLAG_GENERIC(CLONE_SIGHAND), + FLAG_GENERIC(CLONE_PIDFD), FLAG_GENERIC(CLONE_PTRACE), FLAG_GENERIC(CLONE_VFORK), FLAG_GENERIC(CLONE_PARENT), diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 24b25759be..0468a1bad7 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -213,7 +213,7 @@ struct file_clone_range { /* Flags for fork which we can implement within QEMU itself */ #define CLONE_OPTIONAL_FORK_FLAGS \ - (CLONE_SETTLS | CLONE_PARENT_SETTID | \ + (CLONE_SETTLS | CLONE_PARENT_SETTID | CLONE_PIDFD | \ CLONE_CHILD_CLEARTID | CLONE_CHILD_SETTID) /* Flags for thread creation which we can implement within QEMU itself */ @@ -6747,6 +6747,17 @@ static int do_fork(CPUArchState *env, unsigned int f= lags, abi_ulong newsp, return -TARGET_EINVAL; } +#if !defined(__NR_pidfd_open) || !defined(TARGET_NR_pidfd_open) + if (flags & CLONE_PIDFD) { + return -TARGET_EINVAL; + } +#endif + + /* Can not allow CLONE_PIDFD with CLONE_PARENT_SETTID */ + if ((flags & CLONE_PIDFD) && (flags & CLONE_PARENT_SETTID)) { + return -TARGET_EINVAL; + } + if (block_signals()) { return -QEMU_ERESTARTSYS; } @@ -6774,6 +6785,20 @@ static int do_fork(CPUArchState *env, unsigned int f= lags, abi_ulong newsp, ts->child_tidptr =3D child_tidptr; } else { cpu_clone_regs_parent(env, flags); + if (flags & CLONE_PIDFD) { + int pid_fd =3D 0; +#if defined(__NR_pidfd_open) && defined(TARGET_NR_pidfd_open) + int pid_child =3D ret; + pid_fd =3D pidfd_open(pid_child, 0); + if (pid_fd >=3D 0) { + fcntl(pid_fd, F_SETFD, fcntl(pid_fd, F_GETFL) + | FD_CLOEXEC); + } else { + pid_fd =3D 0; + } +#endif + put_user_u32(pid_fd, parent_tidptr); + } fork_end(0); } }