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CVE-2023-0266: ALSA: control: code refactoring for ELEM_READ/ELEM_WRITE operations · torvalds/linux@becf9e5

A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 is missing locks that can be used in a use-after-free that can result in a priviledge escalation to gain ring0 access from the system user. We recommend upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e

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ALSA: control: code refactoring for ELEM_READ/ELEM_WRITE operations

ALSA control core handles ELEM_READ/ELEM_WRITE requests within lock acquisition of a counting semaphore. The lock is acquired in helper functions in the end of call path before calling implementations of each driver.

ioctl(2) with SNDRV_CTL_ELEM_READ … ->snd_ctl_ioctl() ->snd_ctl_elem_read_user() ->snd_ctl_elem_read() ->down_read(controls_rwsem) ->snd_ctl_find_id() ->struct snd_kcontrol.get() ->up_read(controls_rwsem)

ioctl(2) with SNDRV_CTL_ELEM_WRITE … ->snd_ctl_ioctl() ->snd_ctl_elem_write_user() ->snd_ctl_elem_write() ->down_read(controls_rwsem) ->snd_ctl_find_id() ->struct snd_kcontrol.put() ->up_read(controls_rwsem)

This commit moves the lock acquisition to middle of the call graph to simplify the helper functions. As a result:

ioctl(2) with SNDRV_CTL_ELEM_READ … ->snd_ctl_ioctl() ->snd_ctl_elem_read_user() ->down_read(controls_rwsem) ->snd_ctl_elem_read() ->snd_ctl_find_id() ->struct snd_kcontrol.get() ->up_read(controls_rwsem)

ioctl(2) with SNDRV_CTL_ELEM_WRITE … ->snd_ctl_ioctl() ->snd_ctl_elem_write_user() ->down_read(controls_rwsem) ->snd_ctl_elem_write() ->snd_ctl_find_id() ->struct snd_kcontrol.put() ->up_read(controls_rwsem)

Signed-off-by: Takashi Sakamoto [email protected] Signed-off-by: Takashi Iwai [email protected]

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