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>

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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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5

fs/binfmt_elf.c

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5

fs/binfmt_elf_fdpic.c

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4

fs/binfmt_misc.c

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4

include/linux/binfmts.h

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4

include/uapi/linux/binfmts.h

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