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block: Validate segment count for DISCARD and WRITE_ZEROES requests

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Split the data length check into two conditions:

- reject descriptors shorter than one
virtio_blk_discard_write_zeroes segment, and
- reject payloads exceeding MAX_DISCARD_WRITE_ZEROES_SEG segments

Previously only the minimum length was checked and extra segments
were silently dropped.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2026-03-21 09:37:35 +01:00
committed by Rob Bradford
parent fc79d08d7d
commit d3cad420a5
2 changed files with 19 additions and 6 deletions
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virtio-devices/src/block.rs
+4 -3
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@@ -23,7 +23,8 @@ use block::disk_file::DiskBackend;
use block::error::BlockError;
use block::fcntl::{LockError, LockGranularity, LockGranularityChoice, LockType, get_lock_state};
use block::{
ExecuteAsync, ExecuteError, Request, RequestType, VirtioBlockConfig, build_serial, fcntl,
ExecuteAsync, ExecuteError, MAX_DISCARD_WRITE_ZEROES_SEG, Request, RequestType,
VirtioBlockConfig, build_serial, fcntl,
};
use event_monitor::event;
use log::{debug, error, info, warn};
@@ -829,12 +830,12 @@ impl Block {
if avail_features & (1u64 << VIRTIO_BLK_F_WRITE_ZEROES) != 0 {
config.max_write_zeroes_sectors = u32::MAX;
config.max_write_zeroes_seg = 1;
config.max_write_zeroes_seg = MAX_DISCARD_WRITE_ZEROES_SEG;
config.write_zeroes_may_unmap = if discard_supported { 1 } else { 0 };
}
if avail_features & (1u64 << VIRTIO_BLK_F_DISCARD) != 0 {
config.max_discard_sectors = u32::MAX;
config.max_discard_seg = 1;
config.max_discard_seg = MAX_DISCARD_WRITE_ZEROES_SEG;
config.discard_sector_alignment = (logical_block_size / SECTOR_SIZE) as u32;
}