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[Qemu-devel] [PATCH 5/5] linux-user: fake /proc/self/auxv
From: |
Alexander Graf |
Subject: |
[Qemu-devel] [PATCH 5/5] linux-user: fake /proc/self/auxv |
Date: |
Wed, 2 Nov 2011 20:23:26 +0100 |
Gtk tries to read /proc/self/auxv to find its auxv table instead of
taking it from its own program memory space.
However, when running with linux-user, we see the host's auxv which
clearly exposes wrong information. so let's instead expose the guest
memory backed auxv tables via /proc/self/auxv as well.
Signed-off-by: Alexander Graf <address@hidden>
---
linux-user/syscall.c | 30 ++++++++++++++++++++++++++++++
1 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index aaecf53..6061ef8 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4639,6 +4639,35 @@ static int open_self_stat(void *cpu_env, int fd)
return 0;
}
+static int open_self_auxv(void *cpu_env, int fd)
+{
+ TaskState *ts = ((CPUState *)cpu_env)->opaque;
+ abi_ulong auxv = ts->info->saved_auxv;
+ abi_ulong len = ts->info->auxv_len;
+ char *ptr;
+
+ /*
+ * Auxiliary vector is stored in target process stack.
+ * read in whole auxv vector and copy it to file
+ */
+ ptr = lock_user(VERIFY_READ, auxv, len, 0);
+ if (ptr != NULL) {
+ while (len > 0) {
+ ssize_t r;
+ r = write(fd, ptr, len);
+ if (r <= 0) {
+ break;
+ }
+ len -= r;
+ ptr += r;
+ }
+ lseek(fd, 0, SEEK_SET);
+ unlock_user(ptr, auxv, len);
+ }
+
+ return 0;
+}
+
static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode)
{
struct fake_open {
@@ -4649,6 +4678,7 @@ static int do_open(void *cpu_env, const char *pathname,
int flags, mode_t mode)
static const struct fake_open fakes[] = {
{ "/proc/self/maps", open_self_maps },
{ "/proc/self/stat", open_self_stat },
+ { "/proc/self/auxv", open_self_auxv },
{ NULL, NULL }
};
--
1.6.0.2
Re: [Qemu-devel] [PATCH 0/5] linux-user: fake some /proc/self entries, Riku Voipio, 2011/11/03