git: a8d0ba483332 - releng/13.4 - libnv: allocate buffer in a safe way

The branch releng/13.4 has been updated by emaste:

URL: https://cgit.FreeBSD.org/src/commit/?id=a8d0ba483332378e3ecfbd093f2c9a09ec966ae5

commit a8d0ba483332378e3ecfbd093f2c9a09ec966ae5
Author:     Mariusz Zaborski <oshogbo@FreeBSD.org>
AuthorDate: 2024-08-26 18:10:25 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2024-09-04 19:10:18 +0000

    libnv: allocate buffer in a safe way
    
    Ensure that the calculation of size of array doesn't
    overflow.
    
    Security:       FreeBSD-24:09.libnv
    Security:       CVE-2024-45287
    Security:       CAP-02
    Reported by:    Synacktiv
    Reported by:    Taylor R Campbell (NetBSD)
    Sponsored by:   The Alpha-Omega Project
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D46131
    
    (cherry picked from commit 36fa90dbde0060aacb5677d0b113ee168e839071)
    (cherry picked from commit 2e7f9244ebefe019ef016a3a5b47c4562850d1c2)
    
    Approved by:    so
    Approved by:    re (cperciva)
---
 sys/contrib/libnv/bsd_nvpair.c | 18 +++++++++---------
 sys/contrib/libnv/nvlist.c     |  8 ++++++--
 2 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/sys/contrib/libnv/bsd_nvpair.c b/sys/contrib/libnv/bsd_nvpair.c
index 9fd233e1f1d1..41d262a18c9b 100644
--- a/sys/contrib/libnv/bsd_nvpair.c
+++ b/sys/contrib/libnv/bsd_nvpair.c
@@ -997,7 +997,7 @@ nvpair_unpack_string_array(bool isbe __unused, nvpair_t *nvp,
 		return (NULL);
 	}
 
-	value = nv_malloc(sizeof(*value) * nvp->nvp_nitems);
+	value = nv_calloc(nvp->nvp_nitems, sizeof(*value));
 	if (value == NULL)
 		return (NULL);
 
@@ -1090,7 +1090,7 @@ nvpair_unpack_nvlist_array(bool isbe __unused, nvpair_t *nvp,
 		return (NULL);
 	}
 
-	value = nv_malloc(nvp->nvp_nitems * sizeof(*value));
+	value = nv_calloc(nvp->nvp_nitems, sizeof(*value));
 	if (value == NULL)
 		return (NULL);
 
@@ -1328,10 +1328,10 @@ nvpair_create_bool_array(const char *name, const bool *value, size_t nitems)
 		return (NULL);
 	}
 
-	size = sizeof(value[0]) * nitems;
-	data = nv_malloc(size);
+	data = nv_calloc(nitems, sizeof(value[0]));
 	if (data == NULL)
 		return (NULL);
+	size = sizeof(value[0]) * nitems;
 
 	memcpy(data, value, size);
 	nvp = nvpair_allocv(name, NV_TYPE_BOOL_ARRAY, (uint64_t)(uintptr_t)data,
@@ -1358,10 +1358,10 @@ nvpair_create_number_array(const char *name, const uint64_t *value,
 		return (NULL);
 	}
 
-	size = sizeof(value[0]) * nitems;
-	data = nv_malloc(size);
+	data = nv_calloc(nitems, sizeof(value[0]));
 	if (data == NULL)
 		return (NULL);
+	size = sizeof(value[0]) * nitems;
 
 	memcpy(data, value, size);
 	nvp = nvpair_allocv(name, NV_TYPE_NUMBER_ARRAY,
@@ -1391,7 +1391,7 @@ nvpair_create_string_array(const char *name, const char * const *value,
 
 	nvp = NULL;
 	datasize = 0;
-	data = nv_malloc(sizeof(value[0]) * nitems);
+	data = nv_calloc(nitems, sizeof(value[0]));
 	if (data == NULL)
 		return (NULL);
 
@@ -1438,7 +1438,7 @@ nvpair_create_nvlist_array(const char *name, const nvlist_t * const *value,
 		return (NULL);
 	}
 
-	nvls = nv_malloc(sizeof(value[0]) * nitems);
+	nvls = nv_calloc(nitems, sizeof(value[0]));
 	if (nvls == NULL)
 		return (NULL);
 
@@ -1505,7 +1505,7 @@ nvpair_create_descriptor_array(const char *name, const int *value,
 
 	nvp = NULL;
 
-	fds = nv_malloc(sizeof(value[0]) * nitems);
+	fds = nv_calloc(nitems, sizeof(value[0]));
 	if (fds == NULL)
 		return (NULL);
 	for (ii = 0; ii < nitems; ii++) {
diff --git a/sys/contrib/libnv/nvlist.c b/sys/contrib/libnv/nvlist.c
index 56b818691660..e399d610a7ce 100644
--- a/sys/contrib/libnv/nvlist.c
+++ b/sys/contrib/libnv/nvlist.c
@@ -758,7 +758,7 @@ nvlist_descriptors(const nvlist_t *nvl, size_t *nitemsp)
 	int *fds;
 
 	nitems = nvlist_ndescriptors(nvl);
-	fds = nv_malloc(sizeof(fds[0]) * (nitems + 1));
+	fds = nv_calloc(nitems + 1, sizeof(fds[0]));
 	if (fds == NULL)
 		return (NULL);
 	if (nitems > 0)
@@ -1029,6 +1029,10 @@ static bool
 nvlist_check_header(struct nvlist_header *nvlhdrp)
 {
 
+	if (nvlhdrp->nvlh_size > SIZE_MAX - sizeof(nvlhdrp)) {
+		ERRNO_SET(EINVAL);
+		return (false);
+	}
 	if (nvlhdrp->nvlh_magic != NVLIST_HEADER_MAGIC) {
 		ERRNO_SET(EINVAL);
 		return (false);
@@ -1302,7 +1306,7 @@ nvlist_recv(int sock, int flags)
 		goto out;
 
 	if (nfds > 0) {
-		fds = nv_malloc(nfds * sizeof(fds[0]));
+		fds = nv_calloc(nfds, sizeof(fds[0]));
 		if (fds == NULL)
 			goto out;
 		if (fd_recv(sock, fds, nfds) == -1)