From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Nicolas Pitre To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Alexander Viro , David Howells , Greg Ungerer Subject: [PATCH v2 03/10] binfmt_flat: use generic transfer_args_to_stack() Date: Sun, 17 Jul 2016 23:31:49 -0400 Message-Id: <1468812716-30537-4-git-send-email-nicolas.pitre@linaro.org> In-Reply-To: <1468812716-30537-1-git-send-email-nicolas.pitre@linaro.org> References: <1468812716-30537-1-git-send-email-nicolas.pitre@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: This gets rid of the rather ugly, open coded and suboptimal copy code. Signed-off-by: Nicolas Pitre --- fs/binfmt_flat.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c index 085059d879..64feb873f0 100644 --- a/fs/binfmt_flat.c +++ b/fs/binfmt_flat.c @@ -854,10 +854,8 @@ static int load_flat_binary(struct linux_binprm * bprm) { struct lib_info libinfo; struct pt_regs *regs = current_pt_regs(); - unsigned long p = bprm->p; - unsigned long stack_len; + unsigned long sp, stack_len; unsigned long start_addr; - unsigned long *sp; int res; int i, j; @@ -892,15 +890,15 @@ static int load_flat_binary(struct linux_binprm * bprm) set_binfmt(&flat_format); - p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; - DBG_FLT("p=%lx\n", p); + sp = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; + DBG_FLT("sp=%lx\n", sp); - /* copy the arg pages onto the stack, this could be more efficient :-) */ - for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--) - * (char *) --p = - ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE]; + /* copy the arg pages onto the stack */ + res = transfer_args_to_stack(bprm, &sp); + if (res) + return res; - sp = (unsigned long *) create_flat_tables(p, bprm); + sp = create_flat_tables(sp, bprm); /* Fake some return addresses to ensure the call chain will * initialise library in order for us. We are required to call @@ -912,14 +910,14 @@ static int load_flat_binary(struct linux_binprm * bprm) for (i = MAX_SHARED_LIBS-1; i>0; i--) { if (libinfo.lib_list[i].loaded) { /* Push previos first to call address */ - --sp; put_user(start_addr, sp); + --sp; put_user(start_addr, (unsigned long *)sp); start_addr = libinfo.lib_list[i].entry; } } #endif /* Stash our initial stack pointer into the mm structure */ - current->mm->start_stack = (unsigned long )sp; + current->mm->start_stack = sp; #ifdef FLAT_PLAT_INIT FLAT_PLAT_INIT(regs); -- 2.7.4