You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.3 KiB
69 lines
2.3 KiB
2 years ago
|
commit cf8c6a634c0a04a9f5d198ef05310f85f7338839
|
||
|
|
Author: Florian Weimer <fweimer@redhat.com>
|
||
|
|
Date: Fri Nov 5 17:01:24 2021 +0100
|
||
|
|
|
||
|
|
elf: Earlier missing dynamic segment check in _dl_map_object_from_fd
|
||
|
|
|
||
|
|
Separated debuginfo files have PT_DYNAMIC with p_filesz == 0. We
|
||
|
|
need to check for that before the _dl_map_segments call because
|
||
|
|
that could attempt to write to mappings that extend beyond the end
|
||
|
|
of the file, resulting in SIGBUS.
|
||
|
|
|
||
|
|
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
|
||
|
|
(cherry picked from commit ea32ec354c65ddad11b82ca9d057010df13a9cea)
|
||
|
|
|
||
|
|
diff --git a/elf/dl-load.c b/elf/dl-load.c
|
||
|
|
index 4445c28ef3fb4a7e..0976977fbdf21902 100644
|
||
|
|
--- a/elf/dl-load.c
|
||
|
|
+++ b/elf/dl-load.c
|
||
|
|
@@ -1130,6 +1130,7 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
|
||
|
|
struct loadcmd loadcmds[l->l_phnum];
|
||
|
|
size_t nloadcmds = 0;
|
||
|
|
bool has_holes = false;
|
||
|
|
+ bool empty_dynamic = false;
|
||
|
|
|
||
|
|
/* The struct is initialized to zero so this is not necessary:
|
||
|
|
l->l_ld = 0;
|
||
|
|
@@ -1142,7 +1143,9 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
|
||
|
|
segments are mapped in. We record the addresses it says
|
||
|
|
verbatim, and later correct for the run-time load address. */
|
||
|
|
case PT_DYNAMIC:
|
||
|
|
- if (ph->p_filesz)
|
||
|
|
+ if (ph->p_filesz == 0)
|
||
|
|
+ empty_dynamic = true; /* Usually separate debuginfo. */
|
||
|
|
+ else
|
||
|
|
{
|
||
|
|
/* Debuginfo only files from "objcopy --only-keep-debug"
|
||
|
|
contain a PT_DYNAMIC segment with p_filesz == 0. Skip
|
||
|
|
@@ -1265,6 +1268,13 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
|
||
|
|
goto lose;
|
||
|
|
}
|
||
|
|
|
||
|
|
+ /* This check recognizes most separate debuginfo files. */
|
||
|
|
+ if (__glibc_unlikely ((l->l_ld == 0 && type == ET_DYN) || empty_dynamic))
|
||
|
|
+ {
|
||
|
|
+ errstring = N_("object file has no dynamic section");
|
||
|
|
+ goto lose;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
/* Length of the sections to be loaded. */
|
||
|
|
maplength = loadcmds[nloadcmds - 1].allocend - loadcmds[0].mapstart;
|
||
|
|
|
||
|
|
@@ -1282,15 +1292,7 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
- if (l->l_ld == 0)
|
||
|
|
- {
|
||
|
|
- if (__glibc_unlikely (type == ET_DYN))
|
||
|
|
- {
|
||
|
|
- errstring = N_("object file has no dynamic section");
|
||
|
|
- goto lose;
|
||
|
|
- }
|
||
|
|
- }
|
||
|
|
- else
|
||
|
|
+ if (l->l_ld != 0)
|
||
|
|
l->l_ld = (ElfW(Dyn) *) ((ElfW(Addr)) l->l_ld + l->l_addr);
|
||
|
|
|
||
|
|
elf_get_dynamic_info (l);
|