binfmt_misc: pass binfmt_misc flags to the interpreter
It can be useful to the interpreter to know which flags are in use.
For instance, knowing if the preserve-argv[0] is in use would
allow to skip the pathname argument.
This patch uses an unused auxiliary vector, AT_FLAGS, to add a
flag to inform interpreter if the preserve-argv[0] is enabled.
Note by Helge Deller:
The real-world user of this patch is qemu-user, which needs to know
if it has to preserve the argv[0]. See Debian bug #970460.
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: YunQiang Su <ysu@wavecomp.com>
URL: http://bugs.debian.org/970460
Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 3880a82..c457334 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -153,7 +153,9 @@ static int load_misc_binary(struct linux_binprm *bprm)
if (bprm->interp_flags & BINPRM_FLAGS_PATH_INACCESSIBLE)
goto ret;
- if (!(fmt->flags & MISC_FMT_PRESERVE_ARGV0)) {
+ if (fmt->flags & MISC_FMT_PRESERVE_ARGV0) {
+ bprm->interp_flags |= BINPRM_FLAGS_PRESERVE_ARGV0;
+ } else {
retval = remove_arg_zero(bprm);
if (retval)
goto ret;