git: 99e1896f20a3 - stable/13 - rtld direct exec: add option to ignore LD_ variables
Konstantin Belousov
kib at FreeBSD.org
Fri Jun 4 00:44:27 UTC 2021
The branch stable/13 has been updated by kib:
URL: https://cgit.FreeBSD.org/src/commit/?id=99e1896f20a3d7702aedc00c1220bdac12d1580a
commit 99e1896f20a3d7702aedc00c1220bdac12d1580a
Author: Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-05-28 23:59:07 +0000
Commit: Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-06-04 00:32:50 +0000
rtld direct exec: add option to ignore LD_ variables
(cherry picked from commit d81f999ac22342789f2b3e21206d83d410be4df3)
---
libexec/rtld-elf/rtld.1 | 10 +++++++++-
libexec/rtld-elf/rtld.c | 3 +++
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/libexec/rtld-elf/rtld.1 b/libexec/rtld-elf/rtld.1
index 47bdc028b22d..522382d24b16 100644
--- a/libexec/rtld-elf/rtld.1
+++ b/libexec/rtld-elf/rtld.1
@@ -28,7 +28,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd June 1, 2020
+.Dd March 24, 2021
.Dt RTLD 1
.Os
.Sh NAME
@@ -131,6 +131,7 @@ all the environment variables listed below, but is being prefixed with
.Ev LD_32_ ,
for example:
.Ev LD_32_TRACE_LOADED_OBJECTS .
+If the activated image is setuid or setgid, the variables are ignored.
.Bl -tag -width ".Ev LD_LIBMAP_DISABLE"
.It Ev LD_DUMP_REL_POST
If set,
@@ -305,6 +306,8 @@ The syntax of the direct invocation is
.Op Fl b Ar exe
.Op Fl f Ar fd
.Op Fl p
+.Op Fl t
+.Op Fl v
.Op Fl -
.Pa image_path
.Op Ar image arguments
@@ -345,6 +348,11 @@ character,
uses the search path provided by the environment variable
.Dv PATH
to find the binary to execute.
+.It Fl t
+Ignore all
+.Ev LD_
+environment variables that otherwise affect the dynamic
+linker behavior.
.It Fl v
Display information about this run-time linker binary, then exit.
.It Fl -
diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c
index 2943c1d06fa3..ae74f7b9a543 100644
--- a/libexec/rtld-elf/rtld.c
+++ b/libexec/rtld-elf/rtld.c
@@ -5773,6 +5773,8 @@ parse_args(char* argv[], int argc, bool *use_pathp, int *fdp,
break;
} else if (opt == 'p') {
*use_pathp = true;
+ } else if (opt == 't') {
+ trust = false;
} else if (opt == 'v') {
machine[0] = '\0';
mib[0] = CTL_HW;
@@ -5843,6 +5845,7 @@ print_usage(const char *argv0)
" -b <exe> Execute <exe> instead of <binary>, arg0 is <binary>\n"
" -f <FD> Execute <FD> instead of searching for <binary>\n"
" -p Search in PATH for named binary\n"
+ " -t Ignore LD_ environment variables\n"
" -v Display identification information\n"
" -- End of RTLD options\n"
" <binary> Name of process to execute\n"
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