Description
In the Linux kernel, the following vulnerability has been resolved: ASoC: sprd: validate compress buffer sizes against fixed allocations sprd_platform_compr_open() allocates the stage 0 IRAM buffer (32K data area) and the stage 1 DDR buffer (2M data area) with fixed sizes, but sprd_platform_compr_copy() derives all copy lengths from the user controlled runtime->fragment_size and the write() count, never comparing them against the physical buffer sizes. The compress core only checks fragment_size * fragments for an u32 overflow in snd_compress_check_input(), so a local user can configure a logical buffer of up to ~4GB via SNDRV_COMPRESS_SET_PARAMS, far exceeding the fixed allocations. A fragment_size larger than the 32K IRAM data area makes the stage 0 copy_from_user() overflow past the IRAM allocation, and a buffer_size larger than the 2M DDR buffer makes the wrapping copy at the end of sprd_platform_compr_copy() write fully user controlled data past the buffer. No SNDRV_PCM_TRIGGER_START is needed, a write() in SETUP state reaches the copy callback directly. Reject parameters that do not fit into the fixed buffers in set_params(), and fix the advertised max fragment size: 128K never fitted into the 32K IRAM buffer. The caps values may have been carried over from the qdsp6 driver, which allocates its buffers according to the advertised maxima, unlike this driver. With 32K as max fragment size the advertised limits are self-consistent: 32K * 64 = 2M equals the DDR buffer size. Discovered by Atuin - Automated Vulnerability Discovery Engine.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
cce1396936ef2b347d622b4d49718818eb32029d to < 2fada8276117215407afd1f59de5d2fe22aff01faffectedcce1396936ef2b347d622b4d49718818eb32029d to < ad796a1bc1875da2ebb616ea9bc1f2994273fd02affectedcce1396936ef2b347d622b4d49718818eb32029d to < 2e27144ba4b98bb3eb14aaccd4b088e2e69844e3affectedcce1396936ef2b347d622b4d49718818eb32029d to < 1467e3989c6edf79d3898c78aa47027f31ee5acbaffectedcce1396936ef2b347d622b4d49718818eb32029d to < 38a9bb5221bcdece5507299f739c6751d8fc16b2affectedcce1396936ef2b347d622b4d49718818eb32029d to < ff63b0adc4f6a5b61c8393d204fac44c594c4d39affectedcce1396936ef2b347d622b4d49718818eb32029d to < 8064b73997f137c00a7e2e38295a763f9423928baffectedcce1396936ef2b347d622b4d49718818eb32029d to < 7a4ce92d150b9e7ecf1a710a34d8cdeb590d3751affected
Linux Linux
Default version status: affected
5.2affected0 to < 5.2unaffected5.10.271 to ≤ 5.10.*unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.53 to ≤ 6.18.*unaffected7.2.7 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/2fada8276117215407afd1f59de5d2fe22aff01f ↗
- https://git.kernel.org/stable/c/ad796a1bc1875da2ebb616ea9bc1f2994273fd02 ↗
- https://git.kernel.org/stable/c/2e27144ba4b98bb3eb14aaccd4b088e2e69844e3 ↗
- https://git.kernel.org/stable/c/1467e3989c6edf79d3898c78aa47027f31ee5acb ↗
- https://git.kernel.org/stable/c/38a9bb5221bcdece5507299f739c6751d8fc16b2 ↗
- https://git.kernel.org/stable/c/ff63b0adc4f6a5b61c8393d204fac44c594c4d39 ↗
- https://git.kernel.org/stable/c/8064b73997f137c00a7e2e38295a763f9423928b ↗
- https://git.kernel.org/stable/c/7a4ce92d150b9e7ecf1a710a34d8cdeb590d3751 ↗