git: 9dbf67a7948d - stable/14 - kern/sys_process.c: make vmspace_rwmem() similar to io functions

The branch stable/14 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=9dbf67a7948d7ba6bc8baa6d59a30aa2dc75f564

commit 9dbf67a7948d7ba6bc8baa6d59a30aa2dc75f564
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-08-14 05:46:07 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-10-09 02:21:04 +0000

    kern/sys_process.c: make vmspace_rwmem() similar to io functions
    
    PR:     297512
    
    (cherry picked from commit 1a71d24ecd0dbaf61fd2a44166e9be07c328b198)
---
 sys/kern/sys_process.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c
index def87f8a1cd5..ab9aa519046e 100644
--- a/sys/kern/sys_process.c
+++ b/sys/kern/sys_process.c
@@ -430,6 +430,7 @@ vmspace_rwmem(struct vmspace *vm, struct uio *uio)
 	vm_map_t map;
 	vm_offset_t pageno;		/* page number */
 	vm_prot_t reqprot;
+	ssize_t orig_resid;
 	int error, fault_flags, page_offset, writing;
 
 	map = &vm->vm_map;
@@ -443,6 +444,8 @@ vmspace_rwmem(struct vmspace *vm, struct uio *uio)
 	reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
 	fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
 
+	orig_resid = uio->uio_resid;
+
 	/*
 	 * Only map in one page at a time.  We don't have to, but it
 	 * makes things easier.  This way is trivial - right?
@@ -497,8 +500,8 @@ vmspace_rwmem(struct vmspace *vm, struct uio *uio)
 		vm_page_unwire(m, PQ_ACTIVE);
 
 	} while (error == 0 && uio->uio_resid > 0);
+	return (uio->uio_resid == orig_resid ? error : 0);
 
-	return (error);
 }
 
 int