diff options
| author | Laurent Vivier <laurent@vivier.eu> | 2020-01-28 16:25:39 +0300 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2021-02-15 20:28:30 +0300 |
| commit | 2347961b11d4079deace3c81dceed460c08a8fc1 (patch) | |
| tree | 95d1d45ad5830c673b6d19b08ede9e9675571926 /include | |
| parent | b7795074a04669d0a023babf786d29bf67c68783 (diff) | |
| download | linux-2347961b11d4079deace3c81dceed460c08a8fc1.tar.xz | |
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 'include')
| -rw-r--r-- | include/linux/binfmts.h | 4 | ||||
| -rw-r--r-- | include/uapi/linux/binfmts.h | 4 |
2 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h index 0571701ab1c5..0abd93efc181 100644 --- a/include/linux/binfmts.h +++ b/include/linux/binfmts.h @@ -73,6 +73,10 @@ struct linux_binprm { #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) +/* preserve argv0 for the interpreter */ +#define BINPRM_FLAGS_PRESERVE_ARGV0_BIT 3 +#define BINPRM_FLAGS_PRESERVE_ARGV0 (1 << BINPRM_FLAGS_PRESERVE_ARGV0_BIT) + /* Function parameter for binfmt->coredump */ struct coredump_params { const kernel_siginfo_t *siginfo; diff --git a/include/uapi/linux/binfmts.h b/include/uapi/linux/binfmts.h index 689025d9c185..c6f9450efc12 100644 --- a/include/uapi/linux/binfmts.h +++ b/include/uapi/linux/binfmts.h @@ -18,4 +18,8 @@ struct pt_regs; /* sizeof(linux_binprm->buf) */ #define BINPRM_BUF_SIZE 256 +/* preserve argv0 for the interpreter */ +#define AT_FLAGS_PRESERVE_ARGV0_BIT 0 +#define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT) + #endif /* _UAPI_LINUX_BINFMTS_H */ |