This is a note to let you know that I've just added the patch titled
sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sata_fsl-fix-uaf-in-sata_fsl_port_stop-when-rmmod-sata_fsl.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6c8ad7e8cf29eb55836e7a0215f967746ab2b504 Mon Sep 17 00:00:00 2001
From: Baokun Li <libaokun1@xxxxxxxxxx>
Date: Fri, 26 Nov 2021 10:03:06 +0800
Subject: sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl
From: Baokun Li <libaokun1@xxxxxxxxxx>
commit 6c8ad7e8cf29eb55836e7a0215f967746ab2b504 upstream.
When the `rmmod sata_fsl.ko` command is executed in the PPC64 GNU/Linux,
a bug is reported:
==================================================================
BUG: Unable to handle kernel data access on read at 0x80000800805b502c
Oops: Kernel access of bad area, sig: 11 [#1]
NIP [c0000000000388a4] .ioread32+0x4/0x20
LR [80000000000c6034] .sata_fsl_port_stop+0x44/0xe0 [sata_fsl]
Call Trace:
.free_irq+0x1c/0x4e0 (unreliable)
.ata_host_stop+0x74/0xd0 [libata]
.release_nodes+0x330/0x3f0
.device_release_driver_internal+0x178/0x2c0
.driver_detach+0x64/0xd0
.bus_remove_driver+0x70/0xf0
.driver_unregister+0x38/0x80
.platform_driver_unregister+0x14/0x30
.fsl_sata_driver_exit+0x18/0xa20 [sata_fsl]
.__se_sys_delete_module+0x1ec/0x2d0
.system_call_exception+0xfc/0x1f0
system_call_common+0xf8/0x200
==================================================================
The triggering of the BUG is shown in the following stack:
driver_detach
device_release_driver_internal
__device_release_driver
drv->remove(dev) --> platform_drv_remove/platform_remove
drv->remove(dev) --> sata_fsl_remove
iounmap(host_priv->hcr_base); <---- unmap
kfree(host_priv); <---- free
devres_release_all
release_nodes
dr->node.release(dev, dr->data) --> ata_host_stop
ap->ops->port_stop(ap) --> sata_fsl_port_stop
ioread32(hcr_base + HCONTROL) <---- UAF
host->ops->host_stop(host)
The iounmap(host_priv->hcr_base) and kfree(host_priv) functions should
not be executed in drv->remove. These functions should be executed in
host_stop after port_stop. Therefore, we move these functions to the
new function sata_fsl_host_stop and bind the new function to host_stop.
Fixes: faf0b2e5afe7 ("drivers/ata: add support to Freescale 3.0Gbps SATA Controller")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxx>
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/ata/sata_fsl.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -1406,6 +1406,14 @@ static int sata_fsl_init_controller(stru
return 0;
}
+static void sata_fsl_host_stop(struct ata_host *host)
+{
+ struct sata_fsl_host_priv *host_priv = host->private_data;
+
+ iounmap(host_priv->hcr_base);
+ kfree(host_priv);
+}
+
/*
* scsi mid-layer and libata interface structures
*/
@@ -1438,6 +1446,8 @@ static struct ata_port_operations sata_f
.port_start = sata_fsl_port_start,
.port_stop = sata_fsl_port_stop,
+ .host_stop = sata_fsl_host_stop,
+
.pmp_attach = sata_fsl_pmp_attach,
.pmp_detach = sata_fsl_pmp_detach,
};
@@ -1572,8 +1582,6 @@ static int sata_fsl_remove(struct platfo
ata_host_detach(host);
irq_dispose_mapping(host_priv->irq);
- iounmap(host_priv->hcr_base);
- kfree(host_priv);
return 0;
}
Patches currently in stable-queue which might be from libaokun1@xxxxxxxxxx are
queue-4.9/sata_fsl-fix-warning-in-remove_proc_entry-when-rmmod-sata_fsl.patch
queue-4.9/sata_fsl-fix-uaf-in-sata_fsl_port_stop-when-rmmod-sata_fsl.patch
