cve-2021-47114
Vulnerability from cvelistv5
Published
2024-03-15 20:14
Modified
2024-11-05 16:16
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
ocfs2: fix data corruption by fallocate
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33e03adafb29eedae1bae9cdb50c1385279fcf65
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/624fa7baa3788dc9e57840ba5b94bc22b03cda57
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6bba4471f0cc1296fe3c2089b9e52442d3074b2e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a1700479524bb9cb5e8ae720236a6fabd003acae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c8d5faee46242c3f33b8a71a4d7d52214785bfcc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cc2edb99ea606a45182b5ea38cc8f4e583aa0774
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cec4e857ffaa8c447f51cd8ab4e72350077b6770
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/33e03adafb29eedae1bae9cdb50c1385279fcf65
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/624fa7baa3788dc9e57840ba5b94bc22b03cda57
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6bba4471f0cc1296fe3c2089b9e52442d3074b2e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a1700479524bb9cb5e8ae720236a6fabd003acae
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c8d5faee46242c3f33b8a71a4d7d52214785bfcc
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cc2edb99ea606a45182b5ea38cc8f4e583aa0774
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cec4e857ffaa8c447f51cd8ab4e72350077b6770
Impacted products
Vendor Product Version
Linux Linux
Show details on NVD website

To clipboard 

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Fix this by\\nzero out eof blocks when extending the inode size.\\n\\nRunning the following command with qemu-image 4.2.1 can get a corrupted\\ncoverted image file easily.\\n\\n    qemu-img convert -p -t none -T none -f qcow2 $qcow_image \\\\\\n             -O qcow2 -o compat=1.1 $qcow_image.conv\\n\\nThe usage of fallocate in qemu is like this, it first punches holes out\\nof inode size, then extend the inode size.\\n\\n    fallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0\\n    fallocate(11, 0, 2276196352, 65536) = 0\\n\\nv1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html\\nv2: https://lore.kernel.org/linux-fsdevel/20210525093034.GB4112@quack2.suse.cz/T/\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ocfs2: corrige la corrupci\u00f3n de datos por fallocate Cuando fallocate perfora agujeros en el tama\u00f1o del inodo, si el isize original est\u00e1 en el medio del \u00faltimo cl\u00faster, entonces la parte desde isize hasta el final del cl\u00faster se pondr\u00e1 a cero con la escritura en el b\u00fafer, en ese momento isize a\u00fan no se ha actualizado para que coincida con el nuevo tama\u00f1o, si se activa la reescritura, invocar\u00e1 ocfs2_writepage()-\u0026gt;block_write_full_page() donde se eliminar\u00e1n las p\u00e1ginas fuera del tama\u00f1o del inodo. Eso causar\u00e1 corrupci\u00f3n de archivos. Solucione este problema poniendo a cero los bloques eof al extender el tama\u00f1o del inodo. Ejecutar el siguiente comando con qemu-image 4.2.1 puede obtener f\u00e1cilmente un archivo de imagen corrupto y convertido. qemu-img convert -p -t none -T none -f qcow2 $qcow_image \\\\ -O qcow2 -o compat=1.1 $qcow_image.conv El uso de fallocate en qemu es as\u00ed, primero perfora agujeros en el tama\u00f1o del inodo, luego ampliar el tama\u00f1o del inodo. fallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0 fallocate(11, 0, 2276196352, 65536) = 0 v1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html v2: https //lore.kernel.org/linux-fsdevel/20210525093034.GB4112@quack2.suse.cz/T/\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33e03adafb29eedae1bae9cdb50c1385279fcf65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/624fa7baa3788dc9e57840ba5b94bc22b03cda57\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6bba4471f0cc1296fe3c2089b9e52442d3074b2e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a1700479524bb9cb5e8ae720236a6fabd003acae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c8d5faee46242c3f33b8a71a4d7d52214785bfcc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc2edb99ea606a45182b5ea38cc8f4e583aa0774\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cec4e857ffaa8c447f51cd8ab4e72350077b6770\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/33e03adafb29eedae1bae9cdb50c1385279fcf65\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/624fa7baa3788dc9e57840ba5b94bc22b03cda57\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/6bba4471f0cc1296fe3c2089b9e52442d3074b2e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/a1700479524bb9cb5e8ae720236a6fabd003acae\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/c8d5faee46242c3f33b8a71a4d7d52214785bfcc\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/cc2edb99ea606a45182b5ea38cc8f4e583aa0774\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/cec4e857ffaa8c447f51cd8ab4e72350077b6770\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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}


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