mirror of
https://github.com/fkie-cad/nvd-json-data-feeds.git
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29 lines
4.4 KiB
JSON
29 lines
4.4 KiB
JSON
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{
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"id": "CVE-2022-49049",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"published": "2025-02-26T07:00:42.170",
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"lastModified": "2025-02-26T07:00:42.170",
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"vulnStatus": "Received",
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"cveTags": [],
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/secretmem: fix panic when growing a memfd_secret\n\nWhen one tries to grow an existing memfd_secret with ftruncate, one gets\na panic [1]. For example, doing the following reliably induces the\npanic:\n\n fd = memfd_secret();\n\n ftruncate(fd, 10);\n ptr = mmap(NULL, 10, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);\n strcpy(ptr, \"123456789\");\n\n munmap(ptr, 10);\n ftruncate(fd, 20);\n\nThe basic reason for this is, when we grow with ftruncate, we call down\ninto simple_setattr, and then truncate_inode_pages_range, and eventually\nwe try to zero part of the memory. The normal truncation code does this\nvia the direct map (i.e., it calls page_address() and hands that to\nmemset()).\n\nFor memfd_secret though, we specifically don't map our pages via the\ndirect map (i.e. we call set_direct_map_invalid_noflush() on every\nfault). So the address returned by page_address() isn't useful, and\nwhen we try to memset() with it we panic.\n\nThis patch avoids the panic by implementing a custom setattr for\nmemfd_secret, which detects resizes specifically (setting the size for\nthe first time works just fine, since there are no existing pages to try\nto zero), and rejects them with EINVAL.\n\nOne could argue growing should be supported, but I think that will\nrequire a significantly more lengthy change. So, I propose a minimal\nfix for the benefit of stable kernels, and then perhaps to extend\nmemfd_secret to support growing in a separate patch.\n\n[1]:\n\n BUG: unable to handle page fault for address: ffffa0a889277028\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD afa01067 P4D afa01067 PUD 83f909067 PMD 83f8bf067 PTE 800ffffef6d88060\n Oops: 0002 [#1] PREEMPT SMP DEBUG_PAGEALLOC PTI\n CPU: 0 PID: 281 Comm: repro Not tainted 5.17.0-dbg-DEV #1\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n RIP: 0010:memset_erms+0x9/0x10\n Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01\n RSP: 0018:ffffb932c09afbf0 EFLAGS: 00010246\n RAX: 0000000000000000 RBX: ffffda63c4249dc0 RCX: 0000000000000fd8\n RDX: 0000000000000fd8 RSI: 0000000000000000 RDI: ffffa0a889277028\n RBP: ffffb932c09afc00 R08: 0000000000001000 R09: ffffa0a889277028\n R10: 0000000000020023 R11: 0000000000000000 R12: ffffda63c4249dc0\n R13: ffffa0a890d70d98 R14: 0000000000000028 R15: 0000000000000fd8\n FS: 00007f7294899580(0000) GS:ffffa0af9bc00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: ffffa0a889277028 CR3: 0000000107ef6006 CR4: 0000000000370ef0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n ? zero_user_segments+0x82/0x190\n truncate_inode_partial_folio+0xd4/0x2a0\n truncate_inode_pages_range+0x380/0x830\n truncate_setsize+0x63/0x80\n simple_setattr+0x37/0x60\n notify_change+0x3d8/0x4d0\n do_sys_ftruncate+0x162/0x1d0\n __x64_sys_ftruncate+0x1c/0x20\n do_syscall_64+0x44/0xa0\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n Modules linked in: xhci_pci xhci_hcd virtio_net net_failover failover virtio_blk virtio_balloon uhci_hcd ohci_pci ohci_hcd evdev ehci_pci ehci_hcd 9pnet_virtio 9p netfs 9pnet\n CR2: ffffa0a889277028\n\n[lkp@intel.com: secretmem_iops can be static]\n Signed-off-by: kernel test robot <lkp@intel.com>\n[axelrasmussen@google.com: return EINVAL]"
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}
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],
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"metrics": {},
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/9d3b877daf805fed29be8f61aa3d0ea37df82c7b",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/b6d17c67885a5624e96eb30c4178c65eea8374bf",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/f9b141f93659e09a52e28791ccbaf69c273b8e92",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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}
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]
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}
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