Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: smb/client: validate new EOF for zero range When FALLOC_FL_ZERO_RANGE is used without FALLOC_FL_KEEP_SIZE, smb3_zero_range() may extend EOF without checking RLIMIT_FSIZE, allowing the file to grow beyond the caller's file-size limit. Fix this by calling inode_newsize_ok() before sending the zero-range request when the operation would extend EOF. Reproducer, using a file on a CIFS mount: bash -c ' FILE=/mnt/cifs/repro trap "" SIGXFSZ ulimit -f 3072 truncate -s 2M "$FILE" fallocate --zero-range -o 0 -l 4M "$FILE" echo "fallocate rc=$?" stat -c "file size=%s" "$FILE" ' Before this change, the operation succeeds despite the 3 MiB limit: fallocate rc=0 file size=4194304 After this change, fallocate fails and leaves the file at 2 MiB.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before 5fbd8848f2e25c8163896ec52863df2305a3bb63; affected 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before 3673f057b64abfa957e8ae84448db69369a5091a; affected 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before 06a4f9049cb6dc319bceec2dc813ba89add8b828; affected 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before f320ca20c273a26cd779bdb2b2e4b076a95c76f6; affected 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before 88972e35750792e717af287dc71f42a03b5cbce4 |
| Linux / Linux | affected 5.1; unaffected 0 before 5.1; unaffected 6.6.160 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/5fbd8848f2e25c8163896ec52863df2305a3bb63
- https://git.kernel.org/stable/c/3673f057b64abfa957e8ae84448db69369a5091a
- https://git.kernel.org/stable/c/06a4f9049cb6dc319bceec2dc813ba89add8b828
- https://git.kernel.org/stable/c/f320ca20c273a26cd779bdb2b2e4b076a95c76f6
- https://git.kernel.org/stable/c/88972e35750792e717af287dc71f42a03b5cbce4