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[Qemu-devel] [Patch] linux-user/syscall.c - don't add GUEST_BASE to NULL
From: |
Jan-Simon Möller |
Subject: |
[Qemu-devel] [Patch] linux-user/syscall.c - don't add GUEST_BASE to NULL pointer |
Date: |
Wed, 26 Aug 2009 00:02:02 +0200 |
User-agent: |
KMail/1.9.9 |
This patch fixes the mount call. GUEST_BASE shouldn't be added to a NULL
pointer on arg5 .
failing call:
mount("rootfs", "/", 0x47a78, MS_MGC_VAL|MS_REMOUNT, 0x10000) = -1 EFAULT (Bad
address)
correct call:
mount("rootfs", "/", 0x37ab0, MS_MGC_VAL|MS_REMOUNT, NULL) = 0
Signed-off-by: Jan-Simon Möller <address@hidden>
---
linux-user/syscall.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 673eed4..5b2ec4f 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4445,12 +4445,16 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
p3 = lock_user_string(arg3);
if (!p || !p2 || !p3)
ret = -TARGET_EFAULT;
- else
+ else {
/* FIXME - arg5 should be locked, but it isn't
clear how to
* do that since it's not guaranteed to be a
NULL-terminated
* string.
*/
- ret = get_errno(mount(p, p2, p3, (unsigned
long)arg4, g2h(arg5)));
+ if ( ! arg5 )
+ ret = get_errno(mount(p, p2, p3, (unsigned
long)arg4, NULL));
+ else
+ ret = get_errno(mount(p, p2, p3, (unsigned
long)arg4, g2h(arg5)));
+ }
unlock_user(p, arg1, 0);
unlock_user(p2, arg2, 0);
unlock_user(p3, arg3, 0);
- [Qemu-devel] [Patch] linux-user/syscall.c - don't add GUEST_BASE to NULL pointer,
Jan-Simon Möller <=