Date: Thu, 19 Mar 2026 00:47:26 +0000 From: Kirk McKusick <mckusick@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 51446d33c6fb - main - Delete error-check code that can never happen. Message-ID: <69bb479e.3bd1f.710a9fc1@gitrepo.freebsd.org>
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The branch main has been updated by mckusick: URL: https://cgit.FreeBSD.org/src/commit/?id=51446d33c6fbc27ce21f54ebb4c27caace48c3be commit 51446d33c6fbc27ce21f54ebb4c27caace48c3be Author: Kirk McKusick <mckusick@FreeBSD.org> AuthorDate: 2026-03-19 00:45:23 +0000 Commit: Kirk McKusick <mckusick@FreeBSD.org> CommitDate: 2026-03-19 00:45:23 +0000 Delete error-check code that can never happen. Near the top of kern_mmap() that implements the mmap(2) system call, it sets prot = PROT_EXTRACT(prot); with So prot can only be the three PROT_ flags. The following test of the user's mmap(2) parameters (near line 275 in vm/vm_mmap.c): if (prot != PROT_NONE && (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0) { return (EXTERROR(EINVAL, "invalid prot %#jx", prot)); } can never fail. This commit deletes it. No functional change intended. Reviewed by: kib MFC-after: 1 week Sponsored by: Netflix --- sys/vm/vm_mmap.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c index 234586893b59..cb5906440f56 100644 --- a/sys/vm/vm_mmap.c +++ b/sys/vm/vm_mmap.c @@ -271,10 +271,6 @@ kern_mmap(struct thread *td, const struct mmap_req *mrp) return (EXTERROR(EINVAL, "both SHARED and PRIVATE set (flags %#jx)", flags)); } - if (prot != PROT_NONE && - (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0) { - return (EXTERROR(EINVAL, "invalid prot %#jx", prot)); - } if ((flags & MAP_GUARD) != 0 && (prot != PROT_NONE || fd != -1 || pos != 0 || (flags & ~(MAP_FIXED | MAP_GUARD | MAP_EXCL | MAP_32BIT | MAP_ALIGNMENT_MASK)) != 0)) {home | help
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