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elf: Never use the file ID of the main executable [BZ #24900]

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If the loader is invoked explicitly and loads the main executable,
it stores the file ID of the main executable in l_file_id.  This
information is not available if the main excutable is loaded by the
kernel, so this is another case where the two cases differ.

This enhances commit 23d2e5faf0
("elf: Self-dlopen failure with explict loader invocation
[BZ #24900]").

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
This commit is contained in:
Florian Weimer 2019-10-04 21:22:54 +02:00
parent eaad14b56a
commit 2b26b084e4
2 changed files with 38 additions and 21 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2019-10-04 Florian Weimer <fweimer@redhat.com>
[BZ #24900]
* elf/dl-load.c (_dl_map_object_from_fd): Do not use the file ID
when loading the executable as part of an explicit loader
invocation.
2019-10-04 Florian Weimer <fweimer@redhat.com> 2019-10-04 Florian Weimer <fweimer@redhat.com>
nptl: Move pthread_attr_setinheritsched implementation into libc. nptl: Move pthread_attr_setinheritsched implementation into libc.

12
elf/dl-load.c
View File

@ -876,8 +876,17 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
struct r_debug *r = _dl_debug_initialize (0, nsid); struct r_debug *r = _dl_debug_initialize (0, nsid);
bool make_consistent = false; bool make_consistent = false;
/* Get file information. */ /* Get file information. To match the kernel behavior, do not fill
in this information for the executable in case of an explicit
loader invocation. */
struct r_file_id id; struct r_file_id id;
if (mode & __RTLD_OPENEXEC)
{
assert (nsid == LM_ID_BASE);
memset (&id, 0, sizeof (id));
}
else
{
if (__glibc_unlikely (!_dl_get_file_id (fd, &id))) if (__glibc_unlikely (!_dl_get_file_id (fd, &id)))
{ {
errstring = N_("cannot stat shared object"); errstring = N_("cannot stat shared object");
@ -903,6 +912,7 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
return l; return l;
} }
}
#ifdef SHARED #ifdef SHARED
/* When loading into a namespace other than the base one we must /* When loading into a namespace other than the base one we must