Date: Thu, 06 Aug 2026 23:21:39 +0000 From: Kyle Evans <kevans@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 387634c880be - stable/14 - kern: syscall_thread_enter() cannot fail Message-ID: <6a751703.251c5.5352c68c@gitrepo.freebsd.org>
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The branch stable/14 has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=387634c880bec9a24388529c7653b52ebea8f828 commit 387634c880bec9a24388529c7653b52ebea8f828 Author: Kyle Evans <kevans@FreeBSD.org> AuthorDate: 2026-06-30 19:12:10 +0000 Commit: Kyle Evans <kevans@FreeBSD.org> CommitDate: 2026-08-06 22:53:07 +0000 kern: syscall_thread_enter() cannot fail Attempting to handle the error gracefully can easily result in missing SIGSYS, so this was made to always succeed in 39024a89146 ("syscalls: fix missing SIGSYS for several ENOSYS errors") and returns the nosys entry on failure. Drop the pretense of returning an error and clean up a few dead error paths. Reviewed by: kib, markj (cherry picked from commit eca26803d880060555393ab89b44b967cd467a0e) --- sys/kern/kern_sig.c | 8 ++------ sys/kern/kern_syscalls.c | 5 ++--- sys/kern/subr_syscall.c | 6 +----- sys/sys/sysent.h | 2 +- 4 files changed, 6 insertions(+), 15 deletions(-) diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c index 88c93b98b646..cf71dfc89c3d 100644 --- a/sys/kern/kern_sig.c +++ b/sys/kern/kern_sig.c @@ -2703,7 +2703,7 @@ ptrace_syscallreq(struct thread *td, struct proc *p, struct sysent *se; register_t rv_saved[2]; unsigned int sc; - int error, nerror; + int nerror; bool audited, sy_thr_static; sc = tsr->ts_sa.code; @@ -2747,12 +2747,8 @@ ptrace_syscallreq(struct thread *td, struct proc *p, audited = AUDIT_SYSCALL_ENTER(sc, td) != 0; if (!sy_thr_static) { - error = syscall_thread_enter(td, &se); + syscall_thread_enter(td, &se); sy_thr_static = (se->sy_thrcnt & SY_THR_STATIC) != 0; - if (error != 0) { - tsr->ts_ret.sr_error = error; - return; - } } rv_saved[0] = td->td_retval[0]; diff --git a/sys/kern/kern_syscalls.c b/sys/kern/kern_syscalls.c index 2dfe162f6c2e..1a5611d3986d 100644 --- a/sys/kern/kern_syscalls.c +++ b/sys/kern/kern_syscalls.c @@ -89,7 +89,7 @@ syscall_thread_drain(struct sysent *se) pause("scdrn", hz/2); } -int +void syscall_thread_enter(struct thread *td, struct sysent **se) { uint32_t cnt, oldcnt; @@ -101,11 +101,10 @@ syscall_thread_enter(struct thread *td, struct sysent **se) oldcnt = (*se)->sy_thrcnt; if ((oldcnt & (SY_THR_DRAINING | SY_THR_ABSENT)) != 0) { *se = &nosys_sysent; - return (0); + break; } cnt = oldcnt + SY_THR_INCR; } while (atomic_cmpset_acq_32(&(*se)->sy_thrcnt, oldcnt, cnt) == 0); - return (0); } void diff --git a/sys/kern/subr_syscall.c b/sys/kern/subr_syscall.c index 139a4df57f13..fecc2ca5dcdf 100644 --- a/sys/kern/subr_syscall.c +++ b/sys/kern/subr_syscall.c @@ -146,12 +146,8 @@ syscallenter(struct thread *td) if (__predict_false(AUDIT_SYSCALL_ENABLED() || SYSTRACE_ENABLED() || !sy_thr_static)) { if (!sy_thr_static) { - error = syscall_thread_enter(td, &se); + syscall_thread_enter(td, &se); sy_thr_static = (se->sy_thrcnt & SY_THR_STATIC) != 0; - if (error != 0) { - td->td_errno = error; - goto retval; - } } #ifdef KDTRACE_HOOKS diff --git a/sys/sys/sysent.h b/sys/sys/sysent.h index c0e5a265fd32..353d5454ec71 100644 --- a/sys/sys/sysent.h +++ b/sys/sys/sysent.h @@ -319,7 +319,7 @@ struct nosys_args; int lkmnosys(struct thread *, struct nosys_args *); int lkmressys(struct thread *, struct nosys_args *); -int syscall_thread_enter(struct thread *td, struct sysent **se); +void syscall_thread_enter(struct thread *td, struct sysent **se); void syscall_thread_exit(struct thread *td, struct sysent *se); int shared_page_alloc(int size, int align);home | help
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