CVE-2024-46744
Vulnerability from cvelistv5
Published
2024-09-18 07:12
Modified
2024-12-19 09:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Squashfs: sanity check symbolic link size Syzkiller reports a "KMSAN: uninit-value in pick_link" bug. This is caused by an uninitialised page, which is ultimately caused by a corrupted symbolic link size read from disk. The reason why the corrupted symlink size causes an uninitialised page is due to the following sequence of events: 1. squashfs_read_inode() is called to read the symbolic link from disk. This assigns the corrupted value 3875536935 to inode->i_size. 2. Later squashfs_symlink_read_folio() is called, which assigns this corrupted value to the length variable, which being a signed int, overflows producing a negative number. 3. The following loop that fills in the page contents checks that the copied bytes is less than length, which being negative means the loop is skipped, producing an uninitialised page. This patch adds a sanity check which checks that the symbolic link size is not larger than expected. -- V2: fix spelling mistake.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/087f25b2d36adae19951114ffcbb7106ed405ebbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1b9451ba6f21478a75288ea3e3fca4be35e2a438Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/810ee43d9cd245d138a2733d87a24858a23f577dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c3af7e460a526007e4bed1ce3623274a1a6afe5ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef4e249971eb77ec33d74c5c3de1e2576faf6c90Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f82cb7f24032ed023fc67d26ea9bf322d8431a90Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fac5e82ab1334fc8ed6ff7183702df634bd1d93dPatch
Impacted products
Vendor Product Version
Linux Linux
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: sanity check symbolic link size\n\nSyzkiller reports a \"KMSAN: uninit-value in pick_link\" bug.\n\nThis is caused by an uninitialised page, which is ultimately caused\nby a corrupted symbolic link size read from disk.\n\nThe reason why the corrupted symlink size causes an uninitialised\npage is due to the following sequence of events:\n\n1. squashfs_read_inode() is called to read the symbolic\n   link from disk.  This assigns the corrupted value\n   3875536935 to inode-\u003ei_size.\n\n2. Later squashfs_symlink_read_folio() is called, which assigns\n   this corrupted value to the length variable, which being a\n   signed int, overflows producing a negative number.\n\n3. The following loop that fills in the page contents checks that\n   the copied bytes is less than length, which being negative means\n   the loop is skipped, producing an uninitialised page.\n\nThis patch adds a sanity check which checks that the symbolic\nlink size is not larger than expected.\n\n--\n\nV2: fix spelling mistake."
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    "dateReserved": "2024-09-11T15:12:18.266Z",
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Later squashfs_symlink_read_folio() is called, which assigns\\n   this corrupted value to the length variable, which being a\\n   signed int, overflows producing a negative number.\\n\\n3. The following loop that fills in the page contents checks that\\n   the copied bytes is less than length, which being negative means\\n   the loop is skipped, producing an uninitialised page.\\n\\nThis patch adds a sanity check which checks that the symbolic\\nlink size is not larger than expected.\\n\\n--\\n\\nV2: fix spelling mistake.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Squashfs: comprobaci\u00f3n de la integridad del tama\u00f1o del enlace simb\u00f3lico Syzkiller informa de un error \\\"KMSAN: uninit-value in pick_link\\\". Esto se debe a una p\u00e1gina no inicializada, que en \u00faltima instancia se debe a un tama\u00f1o de enlace simb\u00f3lico da\u00f1ado le\u00eddo desde el disco. 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  }
}


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