linux-kernel - Re: [PATCH v6 0/3] coresight: prevent deactivate active config while enabling the config

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Message-ID: <174775569626.300098.16572506497364238562.b4-ty@arm.com>
Date: Tue, 20 May 2025 16:41:56 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: mike.leach@...aro.org,
	james.clark@...aro.org,
	alexander.shishkin@...ux.intel.com,
	leo.yan@....com,
	Yeoreum Yun <yeoreum.yun@....com>
Cc: Suzuki K Poulose <suzuki.poulose@....com>,
	coresight@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 0/3] coresight: prevent deactivate active config while enabling the config


On Wed, 14 May 2025 17:19:48 +0100, Yeoreum Yun wrote:
> While enable active config via cscfg_csdev_enable_active_config(),
> active config could be deactivated via configfs' sysfs interface.
> This could make UAF issue in below scenario:
> 
> CPU0                                          CPU1
> (sysfs enable)                                load module
>                                               cscfg_load_config_sets()
>                                               activate config. // sysfs
>                                               (sys_active_cnt == 1)
> ...
> cscfg_csdev_enable_active_config()
> lock(csdev->cscfg_csdev_lock)
> // here load config activate by CPU1
> unlock(csdev->cscfg_csdev_lock)
> 
> [...]

Applied, thanks!

[1/3] coresight/etm4: fix missing disable active config
      https://git.kernel.org/coresight/c/895b12b7
[2/3] coresight: holding cscfg_csdev_lock while removing cscfg from csdev
      https://git.kernel.org/coresight/c/53b9e265
[3/3] coresight: prevent deactivate active config while enabling the config
      https://git.kernel.org/coresight/c/408c97c4

Best regards,
-- 
Suzuki K Poulose <suzuki.poulose@....com>