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elf: Also try DT_RUNPATH for LD_AUDIT dlopen [BZ #28455]

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DT_RUNPATH is only used to find the immediate dependencies of the
executable or shared object containing the DT_RUNPATH entry.  Update
LD_AUDIT dlopen call to try the DT_RUNPATH entry of the executable.

Add tst-audit14a, which is copied from tst-audit14, to DT_RUNPATH and
build tst-audit14 with -Wl,--disable-new-dtags to test DT_RPATH.

This partially fixes BZ #28455.
This commit is contained in:
H.J. Lu 2021-10-15 10:44:49 -07:00
parent 7ac2bee495
commit bfb5ed5df3
3 changed files with 24 additions and 3 deletions
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11
elf/Makefile
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@ -353,10 +353,10 @@ ifneq ($(selinux-enabled),1)
tests-execstack-yes = tst-execstack tst-execstack-needed tst-execstack-prog
endif
ifeq ($(have-depaudit),yes)
tests += tst-audit14 tst-audit15 tst-audit16
tests += tst-audit14 tst-audit15 tst-audit16 tst-audit14a
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-audit14-cmp.out $(objpfx)tst-audit15-cmp.out \
$(objpfx)tst-audit16-cmp.out
$(objpfx)tst-audit16-cmp.out $(objpfx)tst-audit14a-cmp.out
endif
endif
endif
@ -1825,9 +1825,11 @@ $(objpfx)tst-auditmany.out: $(objpfx)tst-auditmanymod1.so \
tst-auditmany-ENV = \
LD_AUDIT=tst-auditmanymod1.so:tst-auditmanymod2.so:tst-auditmanymod3.so:tst-auditmanymod4.so:tst-auditmanymod5.so:tst-auditmanymod6.so:tst-auditmanymod7.so:tst-auditmanymod8.so:tst-auditmanymod9.so
LDFLAGS-tst-audit14 = -Wl,--audit=tst-auditlogmod-1.so
LDFLAGS-tst-audit14 = -Wl,--audit=tst-auditlogmod-1.so,--disable-new-dtags
$(objpfx)tst-auditlogmod-1.so: $(libsupport)
$(objpfx)tst-audit14.out: $(objpfx)tst-auditlogmod-1.so
LDFLAGS-tst-audit14a = -Wl,--audit=tst-auditlogmod-1.so,--enable-new-dtags
$(objpfx)tst-audit14a.out: $(objpfx)tst-auditlogmod-1.so
LDFLAGS-tst-audit15 = \
-Wl,--audit=tst-auditlogmod-1.so,--depaudit=tst-auditlogmod-2.so
$(objpfx)tst-auditlogmod-2.so: $(libsupport)
@ -1854,6 +1856,9 @@ tst-audit17-ENV = LD_AUDIT=$(objpfx)tst-auditmod17.so
$(objpfx)tst-audit14-cmp.out: tst-audit14.exp $(objpfx)tst-audit14.out
cmp $^ > $@; \
$(evaluate-test)
$(objpfx)tst-audit14a-cmp.out: tst-audit14.exp $(objpfx)tst-audit14a.out
cmp $^ > $@; \
$(evaluate-test)
$(objpfx)tst-audit15-cmp.out: tst-audit15.exp $(objpfx)tst-audit15.out
cmp $^ > $@; \
$(evaluate-test)

15
elf/dl-load.c
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@ -2111,6 +2111,21 @@ _dl_map_object (struct link_map *loader, const char *name,
&main_map->l_rpath_dirs,
&realname, &fb, loader ?: main_map, LA_SER_RUNPATH,
&found_other_class);
/* Also try DT_RUNPATH in the executable for LD_AUDIT dlopen
call. */
if (__glibc_unlikely (mode & __RTLD_AUDIT)
&& fd == -1 && !did_main_map
&& main_map != NULL && main_map->l_type != lt_loaded)
{
struct r_search_path_struct l_rpath_dirs;
l_rpath_dirs.dirs = NULL;
if (cache_rpath (main_map, &l_rpath_dirs,
DT_RUNPATH, "RUNPATH"))
fd = open_path (name, namelen, mode, &l_rpath_dirs,
&realname, &fb, loader ?: main_map,
LA_SER_RUNPATH, &found_other_class);
}
}
/* Try the LD_LIBRARY_PATH environment variable. */

1
elf/tst-audit14a.c Normal file
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@ -0,0 +1 @@
#include "tst-audit14.c"