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https://github.com/Divested-Mobile/DivestOS-Build.git
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104 lines
3.0 KiB
Diff
104 lines
3.0 KiB
Diff
From 96a62c1de93a44e6ca69514411baf4b3d67f6dee Mon Sep 17 00:00:00 2001
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From: Lee Susman <lsusman@codeaurora.org>
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Date: Mon, 11 Nov 2013 08:53:40 +0200
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Subject: mmc: card: fix arbitrary write via read handler in mmc_block_test
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In mmc_block_test, the debug_fs based read function handlers write to an
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arbitrary buffer which is given by any user. We add an access_ok check
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to verify that the address pointed by *buffer is not in kernel space.
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Only if the buffer is valid, do we continue the read handler.
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Change-Id: I35fe9bb70df8de92cb4d3b15c851aa9131a0e8d9
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Signed-off-by: Lee Susman <lsusman@codeaurora.org>
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---
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drivers/mmc/card/mmc_block_test.c | 24 ++++++++++++++++++++++++
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1 file changed, 24 insertions(+)
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diff --git a/drivers/mmc/card/mmc_block_test.c b/drivers/mmc/card/mmc_block_test.c
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index ea73352..b24c367 100644
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--- a/drivers/mmc/card/mmc_block_test.c
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+++ b/drivers/mmc/card/mmc_block_test.c
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@@ -2219,6 +2219,9 @@ static ssize_t send_write_packing_test_read(struct file *file,
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size_t count,
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loff_t *offset)
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{
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+ if (!access_ok(VERIFY_WRITE, buffer, count))
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+ return count;
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+
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memset((void *)buffer, 0, count);
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snprintf(buffer, count,
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@@ -2317,6 +2320,9 @@ static ssize_t err_check_test_read(struct file *file,
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size_t count,
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loff_t *offset)
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{
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+ if (!access_ok(VERIFY_WRITE, buffer, count))
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+ return count;
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+
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memset((void *)buffer, 0, count);
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snprintf(buffer, count,
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@@ -2425,6 +2431,9 @@ static ssize_t send_invalid_packed_test_read(struct file *file,
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size_t count,
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loff_t *offset)
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{
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+ if (!access_ok(VERIFY_WRITE, buffer, count))
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+ return count;
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+
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memset((void *)buffer, 0, count);
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snprintf(buffer, count,
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@@ -2539,6 +2548,9 @@ static ssize_t write_packing_control_test_read(struct file *file,
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size_t count,
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loff_t *offset)
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{
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+ if (!access_ok(VERIFY_WRITE, buffer, count))
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+ return count;
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+
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memset((void *)buffer, 0, count);
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snprintf(buffer, count,
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@@ -2621,6 +2633,9 @@ static ssize_t bkops_test_read(struct file *file,
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size_t count,
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loff_t *offset)
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{
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+ if (!access_ok(VERIFY_WRITE, buffer, count))
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+ return count;
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+
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memset((void *)buffer, 0, count);
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snprintf(buffer, count,
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@@ -2709,6 +2724,9 @@ static ssize_t long_sequential_read_test_read(struct file *file,
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size_t count,
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loff_t *offset)
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{
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+ if (!access_ok(VERIFY_WRITE, buffer, count))
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+ return count;
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+
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memset((void *)buffer, 0, count);
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snprintf(buffer, count,
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@@ -2869,6 +2887,9 @@ static ssize_t long_sequential_write_test_read(struct file *file,
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size_t count,
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loff_t *offset)
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{
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+ if (!access_ok(VERIFY_WRITE, buffer, count))
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+ return count;
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+
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memset((void *)buffer, 0, count);
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snprintf(buffer, count,
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@@ -2942,6 +2963,9 @@ static ssize_t new_req_notification_test_read(struct file *file,
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size_t count,
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loff_t *offset)
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{
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+ if (!access_ok(VERIFY_WRITE, buffer, count))
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+ return count;
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+
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memset((void *)buffer, 0, count);
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snprintf(buffer, count,
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--
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cgit v1.1
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