cve-2024-26923
Vulnerability from cvelistv5
Published
2024-04-24 21:49
Modified
2024-11-05 09:18
Severity ?
Summary
af_unix: Fix garbage collector racing against connect()
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e2a03787f4f0abc0072350654ab0ef3324d9db3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/343c5372d5e17b306db5f8f3c895539b06e3177f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47d8ac011fe1c9251070e1bd64cb10b48193ec51
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/507cc232ffe53a352847893f8177d276c3b532a9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a36ae0ec2353015f0f6762e59f4c2dbc0c906423
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b75722be422c276b699200de90527d01c602ea7c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dbdf7bec5c920200077d693193f989cb1513f009
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e76c2678228f6aec74b305ae30c9374cc2f28a51
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Fix garbage collector racing against connect()\n\nGarbage collector does not take into account the risk of embryo getting\nenqueued during the garbage collection. If such embryo has a peer that\ncarries SCM_RIGHTS, two consecutive passes of scan_children() may see a\ndifferent set of children. Leading to an incorrectly elevated inflight\ncount, and then a dangling pointer within the gc_inflight_list.\n\nsockets are AF_UNIX/SOCK_STREAM\nS is an unconnected socket\nL is a listening in-flight socket bound to addr, not in fdtable\nV\u0027s fd will be passed via sendmsg(), gets inflight count bumped\n\nconnect(S, addr)\tsendmsg(S, [V]); close(V)\t__unix_gc()\n----------------\t-------------------------\t-----------\n\nNS = unix_create1()\nskb1 = sock_wmalloc(NS)\nL = unix_find_other(addr)\nunix_state_lock(L)\nunix_peer(S) = NS\n\t\t\t// V count=1 inflight=0\n\n \t\t\tNS = unix_peer(S)\n \t\t\tskb2 = sock_alloc()\n\t\t\tskb_queue_tail(NS, skb2[V])\n\n\t\t\t// V became in-flight\n\t\t\t// V count=2 inflight=1\n\n\t\t\tclose(V)\n\n\t\t\t// V count=1 inflight=1\n\t\t\t// GC candidate condition met\n\n\t\t\t\t\t\tfor u in gc_inflight_list:\n\t\t\t\t\t\t  if (total_refs == inflight_refs)\n\t\t\t\t\t\t    add u to gc_candidates\n\n\t\t\t\t\t\t// gc_candidates={L, V}\n\n\t\t\t\t\t\tfor u in gc_candidates:\n\t\t\t\t\t\t  scan_children(u, dec_inflight)\n\n\t\t\t\t\t\t// embryo (skb1) was not\n\t\t\t\t\t\t// reachable from L yet, so V\u0027s\n\t\t\t\t\t\t// inflight remains unchanged\n__skb_queue_tail(L, skb1)\nunix_state_unlock(L)\n\t\t\t\t\t\tfor u in gc_candidates:\n\t\t\t\t\t\t  if (u.inflight)\n\t\t\t\t\t\t    scan_children(u, inc_inflight_move_tail)\n\n\t\t\t\t\t\t// V count=1 inflight=2 (!)\n\nIf there is a GC-candidate listening socket, lock/unlock its state. This\nmakes GC wait until the end of any ongoing connect() to that socket. After\nflipping the lock, a possibly SCM-laden embryo is already enqueued. And if\nthere is another embryo coming, it can not possibly carry SCM_RIGHTS. At\nthis point, unix_inflight() can not happen because unix_gc_lock is already\ntaken. Inflight graph remains unaffected."
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Leading to an incorrectly elevated inflight\\ncount, and then a dangling pointer within the gc_inflight_list.\\n\\nsockets are AF_UNIX/SOCK_STREAM\\nS is an unconnected socket\\nL is a listening in-flight socket bound to addr, not in fdtable\\nV\u0027s fd will be passed via sendmsg(), gets inflight count bumped\\n\\nconnect(S, addr)\\tsendmsg(S, [V]); close(V)\\t__unix_gc()\\n----------------\\t-------------------------\\t-----------\\n\\nNS = unix_create1()\\nskb1 = sock_wmalloc(NS)\\nL = unix_find_other(addr)\\nunix_state_lock(L)\\nunix_peer(S) = NS\\n\\t\\t\\t// V count=1 inflight=0\\n\\n \\t\\t\\tNS = unix_peer(S)\\n \\t\\t\\tskb2 = sock_alloc()\\n\\t\\t\\tskb_queue_tail(NS, skb2[V])\\n\\n\\t\\t\\t// V became in-flight\\n\\t\\t\\t// V count=2 inflight=1\\n\\n\\t\\t\\tclose(V)\\n\\n\\t\\t\\t// V count=1 inflight=1\\n\\t\\t\\t// GC candidate condition met\\n\\n\\t\\t\\t\\t\\t\\tfor u in gc_inflight_list:\\n\\t\\t\\t\\t\\t\\t  if (total_refs == inflight_refs)\\n\\t\\t\\t\\t\\t\\t    add u to gc_candidates\\n\\n\\t\\t\\t\\t\\t\\t// gc_candidates={L, V}\\n\\n\\t\\t\\t\\t\\t\\tfor u in gc_candidates:\\n\\t\\t\\t\\t\\t\\t  scan_children(u, dec_inflight)\\n\\n\\t\\t\\t\\t\\t\\t// embryo (skb1) was not\\n\\t\\t\\t\\t\\t\\t// reachable from L yet, so V\u0027s\\n\\t\\t\\t\\t\\t\\t// inflight remains unchanged\\n__skb_queue_tail(L, skb1)\\nunix_state_unlock(L)\\n\\t\\t\\t\\t\\t\\tfor u in gc_candidates:\\n\\t\\t\\t\\t\\t\\t  if (u.inflight)\\n\\t\\t\\t\\t\\t\\t    scan_children(u, inc_inflight_move_tail)\\n\\n\\t\\t\\t\\t\\t\\t// V count=1 inflight=2 (!)\\n\\nIf there is a GC-candidate listening socket, lock/unlock its state. 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Si hay un socket de escucha candidato a GC, bloquear/desbloquear su estado. Esto hace que GC espere hasta el final de cualquier conexi\u00f3n () en curso a ese socket. Despu\u00e9s de girar la cerradura, un embri\u00f3n posiblemente cargado de SCM ya est\u00e1 en cola. Y si viene otro embri\u00f3n, no es posible que porte SCM_RIGHTS. En este punto, unix_inflight() no puede ocurrir porque unix_gc_lock ya est\u00e1 en uso. 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