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vboot2: Use more specific error codes, part 2

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Error codes reported by the aligment checks in common.c are now very
specific, and tests verify the proper errors are reported.

Changed args to vb2_member_inside() so I can force wraparounds.

BUG=chromium:370082
BRANCH=none
TEST=make clean && VBOOT2=1 COV=1 make

Change-Id: Ib135674e82005b76bce7a83a1f4a65a9c5296cf4
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/202937
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
This commit is contained in:
Randall Spangler
2014-06-06 09:30:14 -07:00
committed by chrome-internal-fetch
parent b9be53640e
commit 2145721c3c
4 changed files with 103 additions and 65 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
firmware/2lib/2common.c
View File

@@ -20,14 +20,14 @@ int vb2_align(uint8_t **ptr, uint32_t *size, uint32_t align, uint32_t want_size)
offs = align - offs;
if (*size < offs)
return VB2_ERROR_BUFFER_TOO_SMALL;
return VB2_ERROR_ALIGN_BIGGER_THAN_SIZE;
*ptr += offs;
*size -= offs;
}
if (*size < want_size)
return VB2_ERROR_BUFFER_TOO_SMALL;
return VB2_ERROR_ALIGN_SIZE;
return VB2_SUCCESS;
}
@@ -106,10 +106,10 @@ ptrdiff_t vb2_offset_of(const void *base, const void *ptr)
return (uintptr_t)ptr - (uintptr_t)base;
}
int vb2_verify_member_inside(const void *parent, uint32_t parent_size,
const void *member, uint32_t member_size,
uint32_t member_data_offset,
uint32_t member_data_size)
int vb2_verify_member_inside(const void *parent, size_t parent_size,
const void *member, size_t member_size,
ptrdiff_t member_data_offset,
size_t member_data_size)
{
const size_t psize = (size_t)parent_size;
const uintptr_t parent_end = (uintptr_t)parent + parent_size;
@@ -120,23 +120,22 @@ int vb2_verify_member_inside(const void *parent, uint32_t parent_size,
/* Make sure parent doesn't wrap */
if (parent_end < (uintptr_t)parent)
return VB2_ERROR_UNKNOWN;
return VB2_ERROR_INSIDE_PARENT_WRAPS;
/*
* Make sure the member is fully contained in the parent and doesn't
* wrap. Use >, not >=, since member_size = 0 is possible.
*/
if (member_end_offs < member_offs)
return VB2_ERROR_UNKNOWN;
if (member_offs > psize || member_end_offs > psize)
return VB2_ERROR_UNKNOWN;
return VB2_ERROR_INSIDE_MEMBER_WRAPS;
if (member_offs < 0 || member_offs > psize || member_end_offs > psize)
return VB2_ERROR_INSIDE_MEMBER_OUTSIDE;
/* Make sure parent fully contains member data */
if (data_end_offs < data_offs)
return VB2_ERROR_UNKNOWN;
if (data_offs > psize || data_end_offs > psize)
return VB2_ERROR_UNKNOWN;
return VB2_ERROR_INSIDE_DATA_WRAPS;
if (data_offs < 0 || data_offs > psize || data_end_offs > psize)
return VB2_ERROR_INSIDE_DATA_OUTSIDE;
return VB2_SUCCESS;
}

8
firmware/2lib/include/2common.h
View File

@@ -151,10 +151,10 @@ uint8_t *vb2_signature_data(struct vb2_signature *sig);
* @param member_data_size Size of member data in bytes
* @return VB2_SUCCESS, or non-zero if error.
*/
int vb2_verify_member_inside(const void *parent, uint32_t parent_size,
const void *member, uint32_t member_size,
uint32_t member_data_offset,
uint32_t member_data_size);
int vb2_verify_member_inside(const void *parent, size_t parent_size,
const void *member, size_t member_size,
ptrdiff_t member_data_offset,
size_t member_data_size);
/**
* Verify a signature is fully contained in its parent data

26
firmware/2lib/include/2return_codes.h
View File

@@ -99,6 +99,32 @@ enum vb2_return_code {
/* Invalid flags passed to vb2_secdata_set() */
VB2_ERROR_SECDATA_SET_FLAGS,
/**********************************************************************
* Common code errors
*/
VB2_ERROR_COMMON = VB2_ERROR_BASE + 0x050000,
/* Buffer is smaller than alignment offset in vb2_align() */
VB2_ERROR_ALIGN_BIGGER_THAN_SIZE,
/* Buffer is smaller than request in vb2_align() */
VB2_ERROR_ALIGN_SIZE,
/* Parent wraps around in vb2_verify_member_inside() */
VB2_ERROR_INSIDE_PARENT_WRAPS,
/* Member wraps around in vb2_verify_member_inside() */
VB2_ERROR_INSIDE_MEMBER_WRAPS,
/* Member outside parent in vb2_verify_member_inside() */
VB2_ERROR_INSIDE_MEMBER_OUTSIDE,
/* Member data wraps around in vb2_verify_member_inside() */
VB2_ERROR_INSIDE_DATA_WRAPS,
/* Member data outside parent in vb2_verify_member_inside() */
VB2_ERROR_INSIDE_DATA_OUTSIDE,
/**********************************************************************
* TODO: errors which must still be made specific
*/

73
tests/vb2_common_tests.c
View File

@@ -23,27 +23,30 @@ static void test_align(void)
p0 = (uint8_t *)buf;
ptr = p0;
size = 16;
TEST_EQ(vb2_align(&ptr, &size, 4, 16), 0, "vb2_align() aligned");
TEST_SUCC(vb2_align(&ptr, &size, 4, 16), "vb2_align() aligned");
TEST_EQ(vb2_offset_of(p0, ptr), 0, "ptr");
TEST_EQ(size, 16, " size");
TEST_NEQ(vb2_align(&ptr, &size, 4, 17), 0, "vb2_align() small");
TEST_EQ(vb2_align(&ptr, &size, 4, 17),
VB2_ERROR_ALIGN_SIZE, "vb2_align() small");
/* Offset */
ptr = p0 + 1;
size = 15;
TEST_EQ(vb2_align(&ptr, &size, 4, 12), 0, "vb2_align() offset");
TEST_SUCC(vb2_align(&ptr, &size, 4, 12), "vb2_align() offset");
TEST_EQ(vb2_offset_of(p0, ptr), 4, "ptr");
TEST_EQ(size, 12, " size");
/* Offset, now too small */
ptr = p0 + 1;
size = 15;
TEST_NEQ(vb2_align(&ptr, &size, 4, 15), 0, "vb2_align() offset small");
TEST_EQ(vb2_align(&ptr, &size, 4, 15),
VB2_ERROR_ALIGN_SIZE, "vb2_align() offset small");
/* Offset, too small even to align */
ptr = p0 + 1;
size = 1;
TEST_NEQ(vb2_align(&ptr, &size, 4, 1), 0, "vb2_align() offset tiny");
TEST_EQ(vb2_align(&ptr, &size, 4, 1),
VB2_ERROR_ALIGN_BIGGER_THAN_SIZE, "vb2_align() offset tiny");
}
/**
@@ -149,68 +152,78 @@ static void test_helper_functions(void)
{
uint8_t *p = (uint8_t *)test_helper_functions;
TEST_EQ(vb2_verify_member_inside(p, 20, p, 6, 11, 3), 0,
TEST_SUCC(vb2_verify_member_inside(p, 20, p, 6, 11, 3),
"MemberInside ok 1");
TEST_EQ(vb2_verify_member_inside(p, 20, p+4, 4, 8, 4), 0,
TEST_SUCC(vb2_verify_member_inside(p, 20, p+4, 4, 8, 4),
"MemberInside ok 2");
TEST_NEQ(vb2_verify_member_inside(p, 20, p-4, 4, 8, 4), 0,
TEST_EQ(vb2_verify_member_inside(p, 20, p-4, 4, 8, 4),
VB2_ERROR_INSIDE_MEMBER_OUTSIDE,
"MemberInside member before parent");
TEST_NEQ(vb2_verify_member_inside(p, 20, p+20, 4, 8, 4), 0,
TEST_EQ(vb2_verify_member_inside(p, 20, p+20, 4, 8, 4),
VB2_ERROR_INSIDE_MEMBER_OUTSIDE,
"MemberInside member after parent");
TEST_NEQ(vb2_verify_member_inside(p, 20, p, 21, 0, 0), 0,
TEST_EQ(vb2_verify_member_inside(p, 20, p, 21, 0, 0),
VB2_ERROR_INSIDE_MEMBER_OUTSIDE,
"MemberInside member too big");
TEST_NEQ(vb2_verify_member_inside(p, 20, p, 4, 21, 0), 0,
TEST_EQ(vb2_verify_member_inside(p, 20, p, 4, 21, 0),
VB2_ERROR_INSIDE_DATA_OUTSIDE,
"MemberInside data after parent");
TEST_NEQ(vb2_verify_member_inside(p, 20, p, 4, UINT32_MAX, 0),
0, "MemberInside data before parent");
TEST_NEQ(vb2_verify_member_inside(p, 20, p, 4, 4, 17), 0,
TEST_EQ(vb2_verify_member_inside(p, 20, p, 4, SIZE_MAX, 0),
VB2_ERROR_INSIDE_DATA_OUTSIDE,
"MemberInside data before parent");
TEST_EQ(vb2_verify_member_inside(p, 20, p, 4, 4, 17),
VB2_ERROR_INSIDE_DATA_OUTSIDE,
"MemberInside data too big");
TEST_NEQ(vb2_verify_member_inside(p, UINT32_MAX,
p+UINT32_MAX-9, 12, 5, 0), 0,
TEST_EQ(vb2_verify_member_inside(p, -8, p, 12, 0, 0),
VB2_ERROR_INSIDE_PARENT_WRAPS,
"MemberInside wraparound 1");
TEST_NEQ(vb2_verify_member_inside(p, UINT32_MAX,
p+UINT32_MAX-9, 5, 12, 0), 0,
TEST_EQ(vb2_verify_member_inside(p, 20, p, -8, 0, 0),
VB2_ERROR_INSIDE_MEMBER_WRAPS,
"MemberInside wraparound 2");
TEST_NEQ(vb2_verify_member_inside(p, UINT32_MAX,
p+UINT32_MAX-9, 5, 0, 12), 0,
TEST_EQ(vb2_verify_member_inside(p, 20, p, 4, 0, -8),
VB2_ERROR_INSIDE_DATA_WRAPS,
"MemberInside wraparound 3");
}
{
struct vb2_packed_key k = {.key_offset = sizeof(k),
.key_size = 128};
TEST_EQ(vb2_verify_packed_key_inside(&k, sizeof(k)+128, &k), 0,
TEST_SUCC(vb2_verify_packed_key_inside(&k, sizeof(k)+128, &k),
"PublicKeyInside ok 1");
TEST_EQ(vb2_verify_packed_key_inside(&k - 1,
TEST_SUCC(vb2_verify_packed_key_inside(&k - 1,
2*sizeof(k)+128, &k),
0, "PublicKeyInside ok 2");
TEST_NEQ(vb2_verify_packed_key_inside(&k, 128, &k), 0,
"PublicKeyInside ok 2");
TEST_EQ(vb2_verify_packed_key_inside(&k, 128, &k),
VB2_ERROR_INSIDE_DATA_OUTSIDE,
"PublicKeyInside key too big");
}
{
struct vb2_packed_key k = {.key_offset = 100,
.key_size = 4};
TEST_NEQ(vb2_verify_packed_key_inside(&k, 99, &k), 0,
TEST_EQ(vb2_verify_packed_key_inside(&k, 99, &k),
VB2_ERROR_INSIDE_DATA_OUTSIDE,
"PublicKeyInside offset too big");
}
{
struct vb2_signature s = {.sig_offset = sizeof(s),
.sig_size = 128};
TEST_EQ(vb2_verify_signature_inside(&s, sizeof(s)+128, &s), 0,
TEST_SUCC(vb2_verify_signature_inside(&s, sizeof(s)+128, &s),
"SignatureInside ok 1");
TEST_EQ(vb2_verify_signature_inside(&s - 1,
TEST_SUCC(vb2_verify_signature_inside(&s - 1,
2*sizeof(s)+128, &s),
0, "SignatureInside ok 2");
TEST_NEQ(vb2_verify_signature_inside(&s, 128, &s), 0,
"SignatureInside ok 2");
TEST_EQ(vb2_verify_signature_inside(&s, 128, &s),
VB2_ERROR_INSIDE_DATA_OUTSIDE,
"SignatureInside sig too big");
}
{
struct vb2_signature s = {.sig_offset = 100,
.sig_size = 4};
TEST_NEQ(vb2_verify_signature_inside(&s, 99, &s), 0,
TEST_EQ(vb2_verify_signature_inside(&s, 99, &s),
VB2_ERROR_INSIDE_DATA_OUTSIDE,
"SignatureInside offset too big");
}
}