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64 lines
2.2 KiB
Diff
64 lines
2.2 KiB
Diff
From eb7b1426279e751b1fc3e86f434dc349945c1ae7 Mon Sep 17 00:00:00 2001
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From: ahmedsh <ahmedsh@codeaurora.org>
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Date: Wed, 4 Jan 2017 16:00:27 -0500
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Subject: seemp: use local stack mem when encoding params
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Avoid race condition in driver when encoding param by
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reading contents from a local copy instead of msg buffer
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itself which can be mapped to user space.
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Change-Id: I9f111c078baefca6e6f1fcda30af1044891a3356
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Signed-off-by: Ahmed Sheikh <ahmedsh@codeaurora.org>
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---
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.../platform/msm/seemp_core/seemp_event_encoder.c | 21 ++++++++++++++++-----
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1 file changed, 16 insertions(+), 5 deletions(-)
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diff --git a/drivers/platform/msm/seemp_core/seemp_event_encoder.c b/drivers/platform/msm/seemp_core/seemp_event_encoder.c
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index df56a84..36901f5 100644
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--- a/drivers/platform/msm/seemp_core/seemp_event_encoder.c
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+++ b/drivers/platform/msm/seemp_core/seemp_event_encoder.c
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@@ -1,5 +1,5 @@
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/*
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- * Copyright (c) 2015, The Linux Foundation. All rights reserved.
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+ * Copyright (c) 2015, 2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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@@ -48,9 +48,15 @@ static void check_param_range(char *section_eq, bool param,
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void encode_seemp_params(struct seemp_logk_blk *blk)
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{
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- char *s = blk->payload.msg + 1;
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+ struct seemp_logk_blk tmp;
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+ char *s = 0;
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+ char *msg_section_start = 0;
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+ char *msg_section_eq = 0;
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+ char *msg_s = 0;
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- blk->payload.msg[BLK_MAX_MSG_SZ - 1] = 0; /* zero-terminate */
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+ memcpy(tmp.payload.msg, blk->payload.msg, BLK_MAX_MSG_SZ);
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+ s = tmp.payload.msg + 1;
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+ tmp.payload.msg[BLK_MAX_MSG_SZ - 1] = 0; /* zero-terminate */
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while (true) {
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char *section_start = s;
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@@ -105,8 +111,13 @@ void encode_seemp_params(struct seemp_logk_blk *blk)
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}
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}
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- encode_seemp_section(section_start, section_eq, s, param,
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- numeric, id, numeric_value);
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+ msg_section_start = blk->payload.msg + (section_start -
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+ tmp.payload.msg);
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+ msg_section_eq = blk->payload.msg + (section_eq -
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+ tmp.payload.msg);
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+ msg_s = blk->payload.msg + (s - tmp.payload.msg);
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+ encode_seemp_section(msg_section_start, msg_section_eq,
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+ msg_s, param, numeric, id, numeric_value);
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if (*s == 0)
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break;
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--
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cgit v1.1
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