From owner-dev-commits-src-all@freebsd.org Thu Sep 16 17:26:53 2021 Return-Path: Delivered-To: dev-commits-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id D337167E0CD; Thu, 16 Sep 2021 17:26:53 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4H9PCK5Mjpz4tsX; Thu, 16 Sep 2021 17:26:53 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 9893025918; Thu, 16 Sep 2021 17:26:53 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 18GHQraH006748; Thu, 16 Sep 2021 17:26:53 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 18GHQrX4006747; Thu, 16 Sep 2021 17:26:53 GMT (envelope-from git) Date: Thu, 16 Sep 2021 17:26:53 GMT Message-Id: <202109161726.18GHQrX4006747@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Konstantin Belousov Subject: git: f575573ca577 - main - Remove PT_GET_SC_ARGS_ALL MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: f575573ca57716395ad88b962388a55d755cf6a7 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Sep 2021 17:26:53 -0000 The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=f575573ca57716395ad88b962388a55d755cf6a7 commit f575573ca57716395ad88b962388a55d755cf6a7 Author: Konstantin Belousov AuthorDate: 2021-09-15 13:24:09 +0000 Commit: Konstantin Belousov CommitDate: 2021-09-16 17:11:27 +0000 Remove PT_GET_SC_ARGS_ALL Reimplement bdf0f24bb16d556a5b by checking for the caller' ABI in the implementation of PT_GET_SC_ARGS, and copying out everything if it is Linuxolator. Also fix a minor information leak: if PT_GET_SC_ARGS_ALL is done on the thread reused after other process, it allows to read some number of that thread last syscall arguments. Clear td_sa.args in thread_alloc(). Reviewed by: jhb Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D31968 --- lib/libsysdecode/mktables | 2 +- sys/amd64/linux/linux_ptrace.c | 18 ++++++++++-------- sys/compat/freebsd32/freebsd32_misc.c | 3 --- sys/kern/kern_thread.c | 1 + sys/kern/sys_process.c | 23 ++++------------------- sys/sys/ptrace.h | 4 ---- 6 files changed, 16 insertions(+), 35 deletions(-) diff --git a/lib/libsysdecode/mktables b/lib/libsysdecode/mktables index 1c263fd3b0b2..3d152a3a2646 100644 --- a/lib/libsysdecode/mktables +++ b/lib/libsysdecode/mktables @@ -116,7 +116,7 @@ gen_table "nfssvcflags" "NFSSVC_[A-Z0-9]+[[:space:]]+0x[0-9]+" "nfs/ gen_table "pathconfname" "_PC_[A-Z4_]+[[:space:]]+[0-9]+" "sys/unistd.h" gen_table "prio" "PRIO_[A-Z]+[[:space:]]+[0-9]" "sys/resource.h" gen_table "procctlcmd" "PROC_[A-Z_]+[[:space:]]+[0-9]" "sys/procctl.h" "PROC_TRACE_CTL_" -gen_table "ptraceop" "PT_[[:alnum:]_]+[[:space:]]+[0-9]+" "sys/ptrace.h" "PT_GET_SC_ARGS_ALL" +gen_table "ptraceop" "PT_[[:alnum:]_]+[[:space:]]+[0-9]+" "sys/ptrace.h" gen_table "quotactlcmds" "Q_[A-Z]+[[:space:]]+0x[0-9]+" "ufs/ufs/quota.h" gen_table "rebootopt" "RB_[A-Z]+[[:space:]]+0x[0-9]+" "sys/reboot.h" gen_table "rforkflags" "RF[A-Z]+[[:space:]]+\([0-9]+<<[0-9]+\)" "sys/unistd.h" diff --git a/sys/amd64/linux/linux_ptrace.c b/sys/amd64/linux/linux_ptrace.c index 70e52c528c72..eb39e3c9ada6 100644 --- a/sys/amd64/linux/linux_ptrace.c +++ b/sys/amd64/linux/linux_ptrace.c @@ -544,17 +544,19 @@ linux_ptrace_get_syscall_info(struct thread *td, pid_t pid, si.op = LINUX_PTRACE_SYSCALL_INFO_ENTRY; si.entry.nr = lwpinfo.pl_syscall_code; /* - * The reason for using PT_GET_SC_ARGS_ALL instead - * of PT_GET_SC_ARGS is to emulate Linux bug which strace(1) - * depends on: at initialization it tests whether ptrace works - * by calling close(2), or some other single-argument syscall, - * _with six arguments_, and then verifies whether it can - * fetch them all using this API; otherwise it bails out. + * The use of PT_GET_SC_ARGS there is special, + * implementation of PT_GET_SC_ARGS for Linux-ABI + * callers emulates Linux bug which strace(1) depends + * on: at initialization it tests whether ptrace works + * by calling close(2), or some other single-argument + * syscall, _with six arguments_, and then verifies + * whether it can fetch them all using this API; + * otherwise it bails out. */ - error = kern_ptrace(td, PT_GET_SC_ARGS_ALL, pid, + error = kern_ptrace(td, PT_GET_SC_ARGS, pid, &si.entry.args, sizeof(si.entry.args)); if (error != 0) { - linux_msg(td, "PT_GET_SC_ARGS_ALL failed with error %d", + linux_msg(td, "PT_GET_SC_ARGS failed with error %d", error); return (error); } diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c index 01d772b35ee8..c417a64d286a 100644 --- a/sys/compat/freebsd32/freebsd32_misc.c +++ b/sys/compat/freebsd32/freebsd32_misc.c @@ -1032,9 +1032,6 @@ freebsd32_ptrace(struct thread *td, struct freebsd32_ptrace_args *uap) r.pc.pc_limit = PAIR32TO64(off_t, r32.pc.pc_limit); data = sizeof(r.pc); break; - case PT_GET_SC_ARGS_ALL: - error = EINVAL; - break; default: addr = uap->addr; break; diff --git a/sys/kern/kern_thread.c b/sys/kern/kern_thread.c index cb35d565974d..65c5cc65c87e 100644 --- a/sys/kern/kern_thread.c +++ b/sys/kern/kern_thread.c @@ -762,6 +762,7 @@ thread_alloc(int pages) return (NULL); } td->td_tid = tid; + bzero(&td->td_sa.args, sizeof(td->td_sa.args)); kmsan_thread_alloc(td); cpu_thread_alloc(td); EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td); diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c index e2d8042744d0..2c212edd0ae7 100644 --- a/sys/kern/sys_process.c +++ b/sys/kern/sys_process.c @@ -527,9 +527,6 @@ sys_ptrace(struct thread *td, struct ptrace_args *uap) else error = copyin(uap->addr, &r.pc, uap->data); break; - case PT_GET_SC_ARGS_ALL: - error = EINVAL; - break; default: addr = uap->addr; break; @@ -711,7 +708,6 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) case PT_SET_EVENT_MASK: case PT_DETACH: case PT_GET_SC_ARGS: - case PT_GET_SC_ARGS_ALL: sx_xlock(&proctree_lock); proctree_locked = true; break; @@ -1011,21 +1007,10 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) break; } bzero(addr, sizeof(td2->td_sa.args)); - bcopy(td2->td_sa.args, addr, td2->td_sa.callp->sy_narg * - sizeof(register_t)); - break; - - case PT_GET_SC_ARGS_ALL: - CTR1(KTR_PTRACE, "PT_GET_SC_ARGS_ALL: pid %d", p->p_pid); - if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 -#ifdef COMPAT_FREEBSD32 - || (wrap32 && !safe) -#endif - ) { - error = EINVAL; - break; - } - bcopy(td2->td_sa.args, addr, sizeof(td2->td_sa.args)); + /* See the explanation in linux_ptrace_get_syscall_info(). */ + bcopy(td2->td_sa.args, addr, SV_PROC_ABI(td->td_proc) == + SV_ABI_LINUX ? sizeof(td2->td_sa.args) : + td2->td_sa.callp->sy_narg * sizeof(register_t)); break; case PT_GET_SC_RET: diff --git a/sys/sys/ptrace.h b/sys/sys/ptrace.h index 066a54f721c8..1e7c1c71056b 100644 --- a/sys/sys/ptrace.h +++ b/sys/sys/ptrace.h @@ -86,10 +86,6 @@ #define PT_VM_TIMESTAMP 40 /* Get VM version (timestamp) */ #define PT_VM_ENTRY 41 /* Get VM map (entry) */ -#ifdef _KERNEL -#define PT_GET_SC_ARGS_ALL 42 /* Used by linux(4) */ -#endif - #define PT_FIRSTMACH 64 /* for machine-specific requests */ #include /* machine-specific requests, if any */