* [binutils-gdb] bfd_mmap_local: Check offset and size
@ 2024-04-04 22:36 H.J. Lu
0 siblings, 0 replies; only message in thread
From: H.J. Lu @ 2024-04-04 22:36 UTC (permalink / raw)
To: binutils-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=0ffdc37b98964477e70bfd63ca28f374193dcdb2
commit 0ffdc37b98964477e70bfd63ca28f374193dcdb2
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Apr 4 06:37:18 2024 -0700
bfd_mmap_local: Check offset and size
Update bfd_mmap_local to return NULL if filesize < offset or filesize -
offset < rsize.
* libbfd.c (bfd_mmap_local): Validate offset and size against
the file size.
Diff:
---
bfd/libbfd.c | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)
diff --git a/bfd/libbfd.c b/bfd/libbfd.c
index 5126ee207a8..86366e496c5 100644
--- a/bfd/libbfd.c
+++ b/bfd/libbfd.c
@@ -1072,18 +1072,15 @@ static void *
bfd_mmap_local (bfd *abfd, size_t rsize, int prot, void **map_addr,
size_t *map_size)
{
- if (!_bfd_constant_p (rsize))
+ ufile_ptr filesize = bfd_get_file_size (abfd);
+ ufile_ptr offset = bfd_tell (abfd);
+ if (filesize < offset || filesize - offset < rsize)
{
- ufile_ptr filesize = bfd_get_file_size (abfd);
- if (filesize != 0 && rsize > filesize)
- {
- bfd_set_error (bfd_error_file_truncated);
- return NULL;
- }
+ bfd_set_error (bfd_error_file_truncated);
+ return NULL;
}
void *mem;
- ufile_ptr offset = bfd_tell (abfd);
mem = bfd_mmap (abfd, NULL, rsize, prot, MAP_PRIVATE, offset,
map_addr, map_size);
return mem;
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