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| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2016-07-24 11:30:24 -0400 |
|---|---|---|
| committer | Greg Ungerer <gerg@linux-m68k.org> | 2016-07-28 13:29:11 +1000 |
| commit | af521f92dcf636c59330233a61cb689d0383c291 (patch) | |
| tree | f99e0a68e37cc4d2d70f4f8b62f68cf9374626cb /fs/binfmt_flat.c | |
| parent | 467aa1465a7b9f0bd1a23c83bff8c38e3c3e660e (diff) | |
| download | lwn-af521f92dcf636c59330233a61cb689d0383c291.tar.gz lwn-af521f92dcf636c59330233a61cb689d0383c291.zip | |
binfmt_flat: update libraries' data segment pointer with userspace accessors
This is needed on systems with a MMU. This also gets rid of the
strangest C code I've seen lateli i.e. an integer indexed with a
pointer value within square brackets. That really looked backwards.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
Diffstat (limited to 'fs/binfmt_flat.c')
| -rw-r--r-- | fs/binfmt_flat.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c index eb747a266537..83e507137112 100644 --- a/fs/binfmt_flat.c +++ b/fs/binfmt_flat.c @@ -894,12 +894,19 @@ static int load_flat_binary(struct linux_binprm *bprm) return res; /* Update data segment pointers for all libraries */ - for (i = 0; i < MAX_SHARED_LIBS; i++) - if (libinfo.lib_list[i].loaded) - for (j = 0; j < MAX_SHARED_LIBS; j++) - (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] = - (libinfo.lib_list[j].loaded) ? - libinfo.lib_list[j].start_data : UNLOADED_LIB; + for (i = 0; i < MAX_SHARED_LIBS; i++) { + if (!libinfo.lib_list[i].loaded) + continue; + for (j = 0; j < MAX_SHARED_LIBS; j++) { + unsigned long val = libinfo.lib_list[j].loaded ? + libinfo.lib_list[j].start_data : UNLOADED_LIB; + unsigned long __user *p = (unsigned long __user *) + libinfo.lib_list[i].start_data; + p -= j + 1; + if (put_user(val, p)) + return -EFAULT; + } + } install_exec_creds(bprm); |