diff options
| author | John Calixto <john.calixto@modsystems.com> | 2011-04-26 18:56:29 -0400 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-05-24 21:02:54 -0400 |
| commit | cb87ea28ed9e75a41eb456bfcb547b4e6f10e750 (patch) | |
| tree | e3fe4a653bd96815c650dd9f5db11edc6b39b0db /drivers/mmc/core/sd_ops.c | |
| parent | 641c3187b9d53cfd4c23b0ce2ab18a13d5e775e5 (diff) | |
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 <john.calixto@modsystems.com>
Reviewed-by: Andrei Warkentin <andreiw@motorola.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/core/sd_ops.c')
| -rw-r--r-- | drivers/mmc/core/sd_ops.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c index a206aea5360d..021fed153804 100644 --- a/drivers/mmc/core/sd_ops.c +++ b/drivers/mmc/core/sd_ops.c @@ -21,7 +21,7 @@ #include "core.h" #include "sd_ops.h" -static int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card) +int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card) { int err; struct mmc_command cmd = {0}; @@ -49,6 +49,7 @@ static int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card) return 0; } +EXPORT_SYMBOL_GPL(mmc_app_cmd); /** * mmc_wait_for_app_cmd - start an application command and wait for |