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From 3a68f90c2a5a208b475cc2014f85ae04541ec5b6 Mon Sep 17 00:00:00 2001
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From: Eugene Syromyatnikov <evgsyr@gmail.com>
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Date: Fri, 20 Aug 2021 21:31:01 +0200
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Subject: [PATCH 150/150] tee: rewrite num_params access in tee_fetch_buf_data
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Pointer to num_params field of the fetched structure is passed in a
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separate function argument which provokes covscan complaints about
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uninitialised accesses and also tingles my aliasing rules senses.
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Rewrite to access it via the arg_struct argument which is fetched
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earlier in the function flow.
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* src/tee.c (TEE_FETCH_BUF_DATA): Change &arg_.num_params
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to offsetof(typeof(arg_), num_params).
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(tee_fetch_buf_data): Accept offset of the num_params field instead
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of pointer to it; reconstruct the num_params pointer using it.
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---
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src/tee.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/src/tee.c b/src/tee.c
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index f9eda52..d7e9b15 100644
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--- a/src/tee.c
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+++ b/src/tee.c
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@@ -33,7 +33,7 @@ struct tee_ioctl_shm_register_fd_data {
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#define TEE_FETCH_BUF_DATA(buf_, arg_, params_) \
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tee_fetch_buf_data(tcp, arg, &buf_, sizeof(arg_), \
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- &arg_, &arg_.num_params, \
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+ &arg_, offsetof(typeof(arg_), num_params), \
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params_)
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/* session id is printed as 0x%x in libteec */
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@@ -56,7 +56,7 @@ tee_fetch_buf_data(struct tcb *const tcp,
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struct tee_ioctl_buf_data *buf,
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size_t arg_size,
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void *arg_struct,
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- unsigned *num_params,
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+ size_t num_params_offs,
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uint64_t *params)
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{
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if (umove_or_printaddr(tcp, arg, buf))
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@@ -69,6 +69,7 @@ tee_fetch_buf_data(struct tcb *const tcp,
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tee_print_buf(buf);
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return RVAL_IOCTL_DECODED;
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}
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+ uint32_t *num_params = (uint32_t *) (arg_struct + num_params_offs);
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if (entering(tcp) &&
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(arg_size + TEE_IOCTL_PARAM_SIZE(*num_params) != buf->buf_len)) {
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/*
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--
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2.1.4
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