Patchwork [5/5] linux-user: fake /proc/self/auxv

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Submitter Alexander Graf
Date Nov. 2, 2011, 7:23 p.m.
Message ID <1320261806-13194-6-git-send-email-agraf@suse.de>
Download mbox | patch
Permalink /patch/123320/
State New
Headers show

Comments

Alexander Graf - Nov. 2, 2011, 7:23 p.m.
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 <agraf@suse.de>
---
 linux-user/syscall.c |   30 ++++++++++++++++++++++++++++++
 1 files changed, 30 insertions(+), 0 deletions(-)

Patch

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 }
     };