diff options
| -rw-r--r-- | fs/binfmt_flat.c | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c index ae8595d49856..7b0265d7f3a8 100644 --- a/fs/binfmt_flat.c +++ b/fs/binfmt_flat.c @@ -419,7 +419,7 @@ static int load_flat_file(struct linux_binprm * bprm, unsigned long textpos = 0, datapos = 0, result; unsigned long realdatastart = 0; unsigned long text_len, data_len, bss_len, stack_len, flags; - unsigned long memp = 0; /* for finding the brk area */ + unsigned long len, reallen, memp = 0; unsigned long extra, rlim; unsigned long *reloc = 0, *rp; struct inode *inode; @@ -540,10 +540,18 @@ static int load_flat_file(struct linux_binprm * bprm, goto err; } + len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); down_write(¤t->mm->mmap_sem); - realdatastart = do_mmap(0, 0, data_len + extra + - MAX_SHARED_LIBS * sizeof(unsigned long), - PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); + realdatastart = do_mmap(0, 0, len, + PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); + /* Remap to use all availabe slack region space */ + if (realdatastart && (realdatastart < (unsigned long)-4096)) { + reallen = ksize(realdatastart); + if (reallen > len) { + realdatastart = do_mremap(realdatastart, len, + reallen, MREMAP_FIXED, realdatastart); + } + } up_write(¤t->mm->mmap_sem); if (realdatastart == 0 || realdatastart >= (unsigned long)-4096) { @@ -584,11 +592,20 @@ static int load_flat_file(struct linux_binprm * bprm, } else { + len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); down_write(¤t->mm->mmap_sem); - textpos = do_mmap(0, 0, text_len + data_len + extra + - MAX_SHARED_LIBS * sizeof(unsigned long), - PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); + textpos = do_mmap(0, 0, len, + PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); + /* Remap to use all availabe slack region space */ + if (textpos && (textpos < (unsigned long) -4096)) { + reallen = ksize(textpos); + if (reallen > len) { + textpos = do_mremap(textpos, len, reallen, + MREMAP_FIXED, textpos); + } + } up_write(¤t->mm->mmap_sem); + if (!textpos || textpos >= (unsigned long) -4096) { if (!textpos) textpos = (unsigned long) -ENOMEM; |