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elf: Don't use .gnu_debuglink if it doesn't exist

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Some binaries contain a gnu_debuglink, even though the actual
file it points to doesn't exist.  In those cases, continue
to use the existing binary instead of trying to load the debuglink file.
This commit is contained in:
Dave Watson 2017-08-16 10:59:32 -07:00
parent 57257060c9
commit 2acc55815c
1 changed files with 15 additions and 1 deletions

16
src/elfxx.c
View file

@ -386,6 +386,8 @@ elf_w (load_debuglink) (const char* file, struct elf_image *ei, int is_local)
{
int ret;
Elf_W (Shdr) *shdr;
Elf_W (Ehdr) *prev_image = ei->image;
off_t prev_size = ei->size;
if (!ei->image)
{
@ -420,7 +422,6 @@ elf_w (load_debuglink) (const char* file, struct elf_image *ei, int is_local)
if (memchr (linkbuf, 0, shdr->sh_size) == NULL)
return 0;
munmap (ei->image, ei->size);
ei->image = NULL;
Debug(1, "Found debuglink section, following %s\n", linkbuf);
@ -456,6 +457,19 @@ elf_w (load_debuglink) (const char* file, struct elf_image *ei, int is_local)
ret = elf_w (load_debuglink) (newname, ei, -1);
}
if (ret == -1)
{
/* No debuglink file found even though .gnu_debuglink existed */
ei->image = prev_image;
ei->size = prev_size;
return 0;
}
else
{
munmap (prev_image, prev_size);
}
return ret;
}
}