From: John Calixto Date: Tue, 26 Apr 2011 22:56:29 +0000 (-0400) Subject: mmc: core: Add mmc CMD+ACMD passthrough ioctl X-Git-Tag: v3.0-rc1~148^2~40 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cb87ea28ed9e75a41eb456bfcb547b4e6f10e750;p=pandora-kernel.git mmc: core: Add mmc CMD+ACMD passthrough ioctl Allows appropriately-privileged applications to send CMD (normal) and ACMD (application-specific; preceded with CMD55) commands to cards/devices on the mmc bus. This is primarily useful for enabling the security functionality built in to every SD card. It can also be used as a generic passthrough (e.g. to enable virtual machines to control mmc bus devices directly). However, this use case has not been tested rigorously. Generic passthrough testing was only conducted for a few non-security opcodes to prove the feasibility of the passthrough. Since any opcode can be sent using this passthrough, it is very possible to render the card/device unusable. Applications that use this ioctl must have CAP_SYS_RAWIO. Security commands tested on TI PCIxx12 (SDHCI), Sigma Designs SMP8652 SoC, TI OMAP3621/OMAP3630 SoC, Samsung S5PC110 SoC, Qualcomm MSM7200A SoC. Signed-off-by: John Calixto Reviewed-by: Andrei Warkentin Reviewed-by: Arnd Bergmann Signed-off-by: Chris Ball --- Reading git-diff-tree failed