Date: Wed, 31 Aug 2022 01:32:13 GMT From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: cd304fdbe95b - stable/13 - i386: do not allow userspace to set tf_trapno on sigreturn(2) Message-ID: <202208310132.27V1WDAj033157@gitrepo.freebsd.org>
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The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=cd304fdbe95b844f4dff5cd40d213f6923c8767b commit cd304fdbe95b844f4dff5cd40d213f6923c8767b Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2022-08-19 01:26:37 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2022-08-31 01:20:27 +0000 i386: do not allow userspace to set tf_trapno on sigreturn(2) PR: 265889 (cherry picked from commit dc4a2d1d0e838579f21d9d1fef8655f902f06ab2) --- sys/i386/i386/exec_machdep.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sys/i386/i386/exec_machdep.c b/sys/i386/i386/exec_machdep.c index 2223dd2a1efa..a3fc0178d322 100644 --- a/sys/i386/i386/exec_machdep.c +++ b/sys/i386/i386/exec_machdep.c @@ -636,6 +636,7 @@ osigreturn(struct thread *td, struct osigreturn_args *uap) regs->tf_esp = scp->sc_sp; regs->tf_eip = scp->sc_pc; regs->tf_eflags = eflags; + regs->tf_trapno = T_RESERVED; #if defined(COMPAT_43) if (scp->sc_onstack & 1) @@ -735,6 +736,7 @@ freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap) bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); } + regs->tf_trapno = T_RESERVED; #if defined(COMPAT_43) if (ucp->uc_mcontext.mc_onstack & 1) @@ -869,6 +871,7 @@ sys_sigreturn(struct thread *td, struct sigreturn_args *uap) return (ret); bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); } + regs->tf_trapno = T_RESERVED; #if defined(COMPAT_43) if (ucp->uc_mcontext.mc_onstack & 1)
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