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vmmcache: fix TOCTOU

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Matheus
2026-04-01 16:46:20 -03:00
parent 774ae10e99
commit a48edb99be
1 changed files with 8 additions and 3 deletions
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kernel-src/mm/vmmcache.c
+8 -3
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@@ -369,10 +369,15 @@ int vmmcache_syncvnode(vnode_t *vnode, uintmax_t offset, size_t size) {
vnodedirtylist = vnodedirtylist->writenext;
page->writenext = NULL;
int error = syncpage(page, false);
// another thread could already have synced this page, verify if it is still dirty
if (page->flags & PAGE_FLAGS_DIRTY) {
int error = syncpage(page, false);
if (e == 0)
e = error;
if (e == 0)
e = error;
} else {
RELEASE_LOCK();
}
// syncpage returns with lock released
}