| Message ID | 53C8CFE7.5080406@samsung.com |
|---|---|
| State | New |
| Headers | show |
Adding Riku Voipio On 18.07.2014 11:42, Mikhail Ilin wrote: > Hi, > > Running 32-bits binaries with address sanitizer (ASAN) instrumentations > fails under 64-bits qemu. During initialization ASAN relies on the output > from /proc/self/mmap then tries to find a big chunk for shadow memory but > it is not happened. > > Reserved memory for guest address space is used privately by qemu to > satisfy user anonymous mmap calls but in the same time it is not hidden > from an application and is reported when a user reads /proc/self/mmap. > Qemu is not fully transparent for a guest. > > The patch covers the case and cleans up the reserved memory map from > the output. > > > From 167c42e6a9521c05ddd7c6dfbb108d2ae65de098 Mon Sep 17 00:00:00 2001 > From: Mikhail Ilyin <m.ilin@samsung.com> > Date: Fri, 18 Jul 2014 10:14:06 +0400 > Subject: [PATCH] Clean up the reserved memory map from /proc/self/mmap > output > which doesn't belong to an emulated process. > > Signed-off-by: Mikhail Ilyin <m.ilin@samsung.com> > --- > linux-user/syscall.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/linux-user/syscall.c b/linux-user/syscall.c > index a50229d..8f406e4 100644 > --- a/linux-user/syscall.c > +++ b/linux-user/syscall.c > @@ -5122,6 +5122,13 @@ static int open_self_maps(void *cpu_env, int fd) > continue; > } > if (h2g_valid(min) && h2g_valid(max)) { > +#ifdef CONFIG_USE_GUEST_BASE > + if (RESERVED_VA) { > + if (mmap_next_start == h2g(max)) { > + continue; > + } > + } > +#endif > dprintf(fd, TARGET_ABI_FMT_lx "-" TARGET_ABI_FMT_lx > " %c%c%c%c %08" PRIx64 " %02x:%02x %d %s%s\n", > h2g(min), h2g(max), flag_r, flag_w,
diff --git a/linux-user/syscall.c b/linux-user/syscall.c index a50229d..8f406e4 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -5122,6 +5122,13 @@ static int open_self_maps(void *cpu_env, int fd) continue; } if (h2g_valid(min) && h2g_valid(max)) { +#ifdef CONFIG_USE_GUEST_BASE + if (RESERVED_VA) { + if (mmap_next_start == h2g(max)) { + continue; + } + } +#endif dprintf(fd, TARGET_ABI_FMT_lx "-" TARGET_ABI_FMT_lx " %c%c%c%c %08" PRIx64 " %02x:%02x %d %s%s\n", h2g(min), h2g(max), flag_r, flag_w,