From: Alan Modra <amodra@gmail.com>
To: binutils@sourceware.org
Subject: Invalid read in process_netbsd_elf_note
Date: Thu, 19 Mar 2020 13:56:10 +1030 [thread overview]
Message-ID: <20200319032608.GB4583@bubble.grove.modra.org> (raw)
* readelf.c (process_netbsd_elf_note): Validate descsz before
accessing descdata. Formatting.
diff --git a/binutils/readelf.c b/binutils/readelf.c
index a11297845e..c8ca66e52c 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -18402,15 +18402,17 @@ process_netbsd_elf_note (Elf_Internal_Note * pnote)
switch (pnote->type)
{
case NT_NETBSD_IDENT:
+ if (pnote->descsz < 1)
+ break;
version = byte_get ((unsigned char *) pnote->descdata, sizeof (version));
if ((version / 10000) % 100)
- printf (" NetBSD\t\t0x%08lx\tIDENT %u (%u.%u%s%c)\n", pnote->descsz,
+ printf (" NetBSD\t\t0x%08lx\tIDENT %u (%u.%u%s%c)\n", pnote->descsz,
version, version / 100000000, (version / 1000000) % 100,
(version / 10000) % 100 > 26 ? "Z" : "",
'A' + (version / 10000) % 26);
else
printf (" NetBSD\t\t0x%08lx\tIDENT %u (%u.%u.%u)\n", pnote->descsz,
- version, version / 100000000, (version / 1000000) % 100,
+ version, version / 100000000, (version / 1000000) % 100,
(version / 100) % 100);
return TRUE;
@@ -18421,6 +18423,8 @@ process_netbsd_elf_note (Elf_Internal_Note * pnote)
#ifdef NT_NETBSD_PAX
case NT_NETBSD_PAX:
+ if (pnote->descsz < 1)
+ break;
version = byte_get ((unsigned char *) pnote->descdata, sizeof (version));
printf (" NetBSD\t\t0x%08lx\tPaX <%s%s%s%s%s%s>\n", pnote->descsz,
((version & NT_NETBSD_PAX_MPROTECT) ? "+mprotect" : ""),
@@ -18431,12 +18435,11 @@ process_netbsd_elf_note (Elf_Internal_Note * pnote)
((version & NT_NETBSD_PAX_NOASLR) ? "-ASLR" : ""));
return TRUE;
#endif
-
- default:
- printf (" NetBSD\t0x%08lx\tUnknown note type: (0x%08lx)\n", pnote->descsz,
- pnote->type);
- return FALSE;
}
+
+ printf (" NetBSD\t0x%08lx\tUnknown note type: (0x%08lx)\n",
+ pnote->descsz, pnote->type);
+ return FALSE;
}
static const char *
--
Alan Modra
Australia Development Lab, IBM
next reply other threads:[~2020-03-19 3:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-19 3:26 Alan Modra [this message]
2020-03-19 12:05 ` Kamil Rytarowski
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