When tmpfs is mounted with a size less than one page the number of blocks
is set to 0 which makes the tmpfs mount unlimited. This can lead to a quick
and surprising death is someone typos a tmpfs mount command and writes to much.
tmpfs can still be mounted as unlimited if size or nr_blocks is exactly 0.
Signed-off-by: Michael Marineau <[email protected]>
---
Somehow I was a moron and didn't notice the compiler shouting insults at me,
here is the correct version of the patch. Sorry for the noise :-(
mm/shmem.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/mm/shmem.c b/mm/shmem.c
index 253d205..86b47d8 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2138,6 +2138,8 @@ static int shmem_parse_options(char *options, int *mode, uid_t *uid,
if (*rest)
goto bad_val;
*blocks = size >> PAGE_CACHE_SHIFT;
+ if (size && *blocks == 0)
+ *blocks = 1;
} else if (!strcmp(this_char,"nr_blocks")) {
*blocks = memparse(value,&rest);
if (*rest)
--
1.5.1.6
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