From: Simon Glass <s...@chromium.org>
Allow enabling ASSUME_VALID_INPUT to disable sanity checks on the device
tree and the parameters to libfdt. This assumption covers that cases where
the problem could be with either.
Signed-off-by: Simon Glass <s...@chromium.org>
Message-Id: <20200220214557.176528-5-...@chromium.org>
Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
---
cpukit/dtc/libfdt/fdt.c | 11 ++++++---
cpukit/dtc/libfdt/fdt_ro.c | 61 +++++++++++++++++++++++++++++++---------------
2 files changed, 48 insertions(+), 24 deletions(-)
diff --git a/cpukit/dtc/libfdt/fdt.c b/cpukit/dtc/libfdt/fdt.c
index d4daf6096c..0dabb920ad 100644
--- a/cpukit/dtc/libfdt/fdt.c
+++ b/cpukit/dtc/libfdt/fdt.c
@@ -129,10 +129,11 @@ const void *fdt_offset_ptr(const void *fdt, int offset,
unsigned int len)
{
unsigned absoffset = offset + fdt_off_dt_struct(fdt);
- if ((absoffset < offset)
- || ((absoffset + len) < absoffset)
- || (absoffset + len) > fdt_totalsize(fdt))
- return NULL;
+ if (!can_assume(VALID_INPUT))
+ if ((absoffset < offset)
+ || ((absoffset + len) < absoffset)
+ || (absoffset + len) > fdt_totalsize(fdt))
+ return NULL;
if (fdt_version(fdt) >= 0x11)
if (((offset + len) < offset)
@@ -197,6 +198,8 @@ uint32_t fdt_next_tag(const void *fdt, int startoffset, int
*nextoffset)
int fdt_check_node_offset_(const void *fdt, int offset)
{
+ if (can_assume(VALID_INPUT))
+ return offset;
if ((offset < 0) || (offset % FDT_TAGSIZE)
|| (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
return -FDT_ERR_BADOFFSET;
diff --git a/cpukit/dtc/libfdt/fdt_ro.c b/cpukit/dtc/libfdt/fdt_ro.c
index 4c26fbeb8d..9c325591ae 100644
--- a/cpukit/dtc/libfdt/fdt_ro.c
+++ b/cpukit/dtc/libfdt/fdt_ro.c
@@ -33,17 +33,26 @@ static int fdt_nodename_eq_(const void *fdt, int offset,
const char *fdt_get_string(const void *fdt, int stroffset, int *lenp)
{
- int32_t totalsize = fdt_ro_probe_(fdt);
- uint32_t absoffset = stroffset + fdt_off_dt_strings(fdt);
+ int32_t totalsize;
+ uint32_t absoffset;
size_t len;
int err;
const char *s, *n;
+ if (can_assume(VALID_INPUT)) {
+ s = (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
+
+ if (lenp)
+ *lenp = strlen(s);
+ return s;
+ }
+ totalsize = fdt_ro_probe_(fdt);
err = totalsize;
if (totalsize < 0)
goto fail;
err = -FDT_ERR_BADOFFSET;
+ absoffset = stroffset + fdt_off_dt_strings(fdt);
if (absoffset >= totalsize)
goto fail;
len = totalsize - absoffset;
@@ -151,10 +160,13 @@ static const struct fdt_reserve_entry *fdt_mem_rsv(const
void *fdt, int n)
int offset = n * sizeof(struct fdt_reserve_entry);
int absoffset = fdt_off_mem_rsvmap(fdt) + offset;
- if (absoffset < fdt_off_mem_rsvmap(fdt))
- return NULL;
- if (absoffset > fdt_totalsize(fdt) - sizeof(struct fdt_reserve_entry))
- return NULL;
+ if (!can_assume(VALID_INPUT)) {
+ if (absoffset < fdt_off_mem_rsvmap(fdt))
+ return NULL;
+ if (absoffset > fdt_totalsize(fdt) -
+ sizeof(struct fdt_reserve_entry))
+ return NULL;
+ }
return fdt_mem_rsv_(fdt, n);
}
@@ -164,7 +176,7 @@ int fdt_get_mem_rsv(const void *fdt, int n, uint64_t
*address, uint64_t *size)
FDT_RO_PROBE(fdt);
re = fdt_mem_rsv(fdt, n);
- if (!re)
+ if (!can_assume(VALID_INPUT) && !re)
return -FDT_ERR_BADOFFSET;
*address = fdt64_ld(&re->address);
@@ -346,7 +358,8 @@ static const struct fdt_property
*fdt_get_property_by_offset_(const void *fdt,
int err;
const struct fdt_property *prop;
- if ((err = fdt_check_prop_offset_(fdt, offset)) < 0) {
+ if (!can_assume(VALID_INPUT) &&
+ (err = fdt_check_prop_offset_(fdt, offset)) < 0) {
if (lenp)
*lenp = err;
return NULL;
@@ -462,14 +475,19 @@ const void *fdt_getprop_by_offset(const void *fdt, int
offset,
if (namep) {
const char *name;
int namelen;
- name = fdt_get_string(fdt, fdt32_ld(&prop->nameoff),
- &namelen);
- if (!name) {
- if (lenp)
- *lenp = namelen;
- return NULL;
+
+ if (!can_assume(VALID_INPUT)) {
+ name = fdt_get_string(fdt, fdt32_ld(&prop->nameoff),
+ &namelen);
+ if (!name) {
+ if (lenp)
+ *lenp = namelen;
+ return NULL;
+ }
+ *namep = name;
+ } else {
+ *namep = fdt_string(fdt, fdt32_ld(&prop->nameoff));
}
- *namep = name;
}
/* Handle realignment */
@@ -599,10 +617,12 @@ int fdt_supernode_atdepth_offset(const void *fdt, int
nodeoffset,
}
}
- if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
- return -FDT_ERR_BADOFFSET;
- else if (offset == -FDT_ERR_BADOFFSET)
- return -FDT_ERR_BADSTRUCTURE;
+ if (!can_assume(VALID_INPUT)) {
+ if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
+ return -FDT_ERR_BADOFFSET;
+ else if (offset == -FDT_ERR_BADOFFSET)
+ return -FDT_ERR_BADSTRUCTURE;
+ }
return offset; /* error from fdt_next_node() */
}
@@ -614,7 +634,8 @@ int fdt_node_depth(const void *fdt, int nodeoffset)
err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
if (err)
- return (err < 0) ? err : -FDT_ERR_INTERNAL;
+ return (can_assume(VALID_INPUT) || err < 0) ? err :
+ -FDT_ERR_INTERNAL;
return nodedepth;
}
--
2.16.4
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