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-rw-r--r--fs/binfmt_flat.c31
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(&current->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(&current->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(&current->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(&current->mm->mmap_sem);
+
if (!textpos || textpos >= (unsigned long) -4096) {
if (!textpos)
textpos = (unsigned long) -ENOMEM;