linux-kernel - [PATCH 1/2] Fix AT_EXECFN auxv for no-MMU fdpic

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Message-Id: <1361891347-20806-1-git-send-email-msalter@redhat.com>
Date:	Tue, 26 Feb 2013 10:09:06 -0500
From:	Mark Salter <msalter@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mark Salter <msalter@...hat.com>
Subject: [PATCH 1/2] Fix AT_EXECFN auxv for no-MMU fdpic

In the no-MMU case, the FDPIC loader was passing an offset as the value for
the AT_EXECFN auxv. This patch translates that offset into an actual user
address.

Signed-off-by: Mark Salter <msalter@...hat.com>
---
 fs/binfmt_elf_fdpic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index cb240dd..af4c9a4 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -496,6 +496,7 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 	sp = arch_align_stack(bprm->p);
 #else
 	sp = mm->start_stack;
+	bprm->exec = sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->exec);
 
 	/* stack the program arguments and environment */
 	if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0)
-- 
1.8.1.2

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