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kernel: get_iovecs_from_user(): checks total iovec length against SSIZE_MAX

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* the return type for recvmsg(), sendmsg(), readv(), writev() is ssize_t.
* check required by POSIX.
* fix memory leaks on failure introduced in 00f1e7c5e4

Change-Id: Ibf74ae2035b7e9c7a3db3613f60e06672ded4db0
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5542
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>
This commit is contained in:
Jérôme Duval
2022-08-17 19:44:30 +00:00
committed by waddlesplash
parent c6e6743261
commit 013719cfc6
1 changed files with 13 additions and 3 deletions
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headers/private/kernel/util/iovec_support.h
+13 -3
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@@ -14,7 +14,7 @@ get_iovecs_from_user(const iovec* userVecs, size_t vecCount, iovec*& vecs,
bool permitNull = false)
{
// prevent integer overflow
if (vecCount > IOV_MAX)
if (vecCount > IOV_MAX || vecCount == 0)
return B_BAD_VALUE;
if (!IS_USER_ADDRESS(userVecs))
@@ -24,14 +24,24 @@ get_iovecs_from_user(const iovec* userVecs, size_t vecCount, iovec*& vecs,
if (vecs == NULL)
return B_NO_MEMORY;
if (user_memcpy(vecs, userVecs, sizeof(iovec) * vecCount) != B_OK)
if (user_memcpy(vecs, userVecs, sizeof(iovec) * vecCount) != B_OK) {
free(vecs);
return B_BAD_ADDRESS;
}
size_t total = 0;
for (size_t i = 0; i < vecCount; i++) {
if (permitNull && vecs[i].iov_base == NULL)
continue;
if (!is_user_address_range(vecs[i].iov_base, vecs[i].iov_len))
if (!is_user_address_range(vecs[i].iov_base, vecs[i].iov_len)) {
free(vecs);
return B_BAD_ADDRESS;
}
if (vecs[i].iov_len > SSIZE_MAX || total > (SSIZE_MAX - vecs[i].iov_len)) {
free(vecs);
return B_BAD_VALUE;
}
total += vecs[i].iov_len;
}
return B_OK;