[Xen-devel] [PATCH 09/23] tools/xcutils/readnotes: adjust print_l1_mfn_valid_note

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

Use the new PTRVAL macros and elf_access_unsigned in
print_l1_mfn_valid_note.

No functional change unless the input is wrong, or we are reading a
file for a different endianness.

Separated out from the previous patch because this change does produce
a difference in the generated code.

This is part of the fix to a security issue, XSA-55.

Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Chuck Anderson <chuck.anderson@xxxxxxxxxx>

v2: Split out into its own patch.
---
 tools/xcutils/readnotes.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/tools/xcutils/readnotes.c b/tools/xcutils/readnotes.c
index 2af047d..7ff2530 100644
--- a/tools/xcutils/readnotes.c
+++ b/tools/xcutils/readnotes.c
@@ -77,22 +77,23 @@ static void print_numeric_note(const char *prefix, struct 
elf_binary *elf,
 }
 
 static void print_l1_mfn_valid_note(const char *prefix, struct elf_binary *elf,
-                                   const elf_note *note)
+                                   ELF_HANDLE_DECL(elf_note) note)
 {
        int descsz = elf_uval(elf, note, descsz);
-       const uint32_t *desc32 = elf_note_desc(elf, note);
-       const uint64_t *desc64 = elf_note_desc(elf, note);
+       ELF_PTRVAL_CONST_VOID desc = elf_note_desc(elf, note);
 
        /* XXX should be able to cope with a list of values. */
        switch ( descsz / 2 )
        {
        case 8:
                printf("%s: mask=%#"PRIx64" value=%#"PRIx64"\n", prefix,
-                      desc64[0], desc64[1]);
+                      elf_access_unsigned(elf, desc, 0, 8),
+                      elf_access_unsigned(elf, desc, 8, 8));
                break;
        case 4:
                printf("%s: mask=%#"PRIx32" value=%#"PRIx32"\n", prefix,
-                      desc32[0],desc32[1]);
+                      (uint32_t)elf_access_unsigned(elf, desc, 0, 4),
+                      (uint32_t)elf_access_unsigned(elf, desc, 4, 4));
                break;
        }
 
-- 
1.7.2.5


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel