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| author | Laurent Vivier <laurent@vivier.eu> | 2020-01-28 14:25:39 +0100 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2021-02-15 18:28:30 +0100 |
| commit | 2347961b11d4079deace3c81dceed460c08a8fc1 (patch) | |
| tree | 95d1d45ad5830c673b6d19b08ede9e9675571926 /fs/binfmt_misc.c | |
| parent | b7795074a04669d0a023babf786d29bf67c68783 (diff) | |
| download | lwn-2347961b11d4079deace3c81dceed460c08a8fc1.tar.gz lwn-2347961b11d4079deace3c81dceed460c08a8fc1.zip | |
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>
Diffstat (limited to 'fs/binfmt_misc.c')
| -rw-r--r-- | fs/binfmt_misc.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c index 3880a82da1dc..c457334de43f 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; |