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binfmt_misc: pass binfmt_misc flags to the interpreter

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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>
This commit is contained in:
Laurent Vivier
2020-01-28 14:25:39 +01:00
committed by Helge Deller
parent b7795074a0
commit 2347961b11
5 changed files with 19 additions and 3 deletions
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4
include/uapi/linux/binfmts.h
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@@ -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 */