a799f071ba
- qemu-user: add device mapper and loopback ioctls, enabling kpatkx OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=40
89 lines
2.9 KiB
Diff
89 lines
2.9 KiB
Diff
From 67c12998086c44ebef7f92a394154d6aba446178 Mon Sep 17 00:00:00 2001
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From: Alexander Graf <agraf@suse.de>
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Date: Wed, 2 Nov 2011 09:23:22 +0000
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Subject: [PATCH] linux-user: save auxv length
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We create our own AUXV segment on stack and save a pointer to it.
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However we don't save the length of it, so any code that wants to
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do anything useful with it later on has to walk it again.
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Instead, let's remember the length of our AUXV segment. This
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simplifies later uses by a lot.
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Signed-off-by: Alexander Graf <agraf@suse.de>
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---
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linux-user/elfload.c | 15 ++++-----------
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linux-user/qemu.h | 1 +
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2 files changed, 5 insertions(+), 11 deletions(-)
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diff --git a/linux-user/elfload.c b/linux-user/elfload.c
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index 4635bb2..62bb543 100644
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--- a/linux-user/elfload.c
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+++ b/linux-user/elfload.c
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@@ -1245,6 +1245,7 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
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struct image_info *interp_info)
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{
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abi_ulong sp;
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+ abi_ulong sp_auxv;
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int size;
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int i;
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abi_ulong u_rand_bytes;
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@@ -1316,6 +1317,7 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
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sp -= n; put_user_ual(id, sp); \
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} while(0)
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+ sp_auxv = sp;
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NEW_AUX_ENT (AT_NULL, 0);
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/* There must be exactly DLINFO_ITEMS entries here. */
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@@ -1346,6 +1348,7 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
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#undef NEW_AUX_ENT
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info->saved_auxv = sp;
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+ info->auxv_len = sp_auxv - sp;
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sp = loader_build_argptr(envc, argc, sp, p, 0);
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return sp;
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@@ -2329,9 +2332,8 @@ static void fill_auxv_note(struct memelfnote *note, const TaskState *ts)
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{
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elf_addr_t auxv = (elf_addr_t)ts->info->saved_auxv;
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elf_addr_t orig_auxv = auxv;
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- abi_ulong val;
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void *ptr;
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- int i, len;
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+ int len = ts->info->auxv_len;
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/*
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* Auxiliary vector is stored in target process stack. It contains
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@@ -2339,15 +2341,6 @@ static void fill_auxv_note(struct memelfnote *note, const TaskState *ts)
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* strictly necessary but we do it here for sake of completeness.
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*/
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- /* find out lenght of the vector, AT_NULL is terminator */
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- i = len = 0;
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- do {
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- get_user_ual(val, auxv);
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- i += 2;
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- auxv += 2 * sizeof (elf_addr_t);
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- } while (val != AT_NULL);
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- len = i * sizeof (elf_addr_t);
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-
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/* read in whole auxv vector and copy it to memelfnote */
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ptr = lock_user(VERIFY_READ, orig_auxv, len, 0);
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if (ptr != NULL) {
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diff --git a/linux-user/qemu.h b/linux-user/qemu.h
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index 55ad9d8..ef08d39 100644
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--- a/linux-user/qemu.h
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+++ b/linux-user/qemu.h
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@@ -48,6 +48,7 @@ struct image_info {
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abi_ulong code_offset;
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abi_ulong data_offset;
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abi_ulong saved_auxv;
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+ abi_ulong auxv_len;
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abi_ulong arg_start;
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abi_ulong arg_end;
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int personality;
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--
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1.6.0.2
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