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https://github.com/Divested-Mobile/DivestOS-Build.git
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61 lines
1.9 KiB
Diff
61 lines
1.9 KiB
Diff
From 01b2c9a5d728ff6f2f1f28a5d4e927aaeabf56ed Mon Sep 17 00:00:00 2001
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From: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
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Date: Tue, 25 Oct 2016 16:35:23 -0700
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Subject: soc: qcom: scm: add check to avoid buffer overflow
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There is a posibility of a buffer overflow in scm_call,
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add check to avoid the same.
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Change-Id: Iee908c56ec530569b35dafa060139e0428efc781
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Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
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---
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drivers/soc/qcom/scm.c | 18 ++++++++++++------
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1 file changed, 12 insertions(+), 6 deletions(-)
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diff --git a/drivers/soc/qcom/scm.c b/drivers/soc/qcom/scm.c
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index 714c848..b4713ac 100644
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--- a/drivers/soc/qcom/scm.c
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+++ b/drivers/soc/qcom/scm.c
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@@ -56,9 +56,16 @@ DEFINE_MUTEX(scm_lmh_lock);
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#define SMC_ATOMIC_MASK 0x80000000
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#define IS_CALL_AVAIL_CMD 1
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-#define SCM_BUF_LEN(__cmd_size, __resp_size) \
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- (sizeof(struct scm_command) + sizeof(struct scm_response) + \
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- __cmd_size + __resp_size)
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+#define SCM_BUF_LEN(__cmd_size, __resp_size) ({ \
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+ size_t x = __cmd_size + __resp_size; \
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+ size_t y = sizeof(struct scm_command) + sizeof(struct scm_response); \
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+ size_t result; \
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+ if (x < __cmd_size || (x + y) < x) \
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+ result = 0; \
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+ else \
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+ result = x + y; \
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+ result; \
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+ })
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/**
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* struct scm_command - one SCM command buffer
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* @len: total available memory for command and response
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@@ -356,8 +363,7 @@ int scm_call_noalloc(u32 svc_id, u32 cmd_id, const void *cmd_buf,
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int ret;
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size_t len = SCM_BUF_LEN(cmd_len, resp_len);
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- if (cmd_len > scm_buf_len || resp_len > scm_buf_len ||
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- len > scm_buf_len)
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+ if (len == 0)
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return -EINVAL;
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if (!IS_ALIGNED((unsigned long)scm_buf, PAGE_SIZE))
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@@ -780,7 +786,7 @@ int scm_call(u32 svc_id, u32 cmd_id, const void *cmd_buf, size_t cmd_len,
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int ret;
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size_t len = SCM_BUF_LEN(cmd_len, resp_len);
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- if (cmd_len > len || resp_len > len)
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+ if (len == 0 || PAGE_ALIGN(len) < len)
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return -EINVAL;
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cmd = kzalloc(PAGE_ALIGN(len), GFP_KERNEL);
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--
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cgit v1.1
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