On 08/03/2016 11:48 PM, Nicholas Krause wrote:
> This fixes a kmemleak leak warning complaining about working on
> unitializied memory as found in the function, getname_flages. Seems
What exactly is the kmemleak warning saying?
> that we are indeed working on unitialized memory, as the filename
> char pointer is never made to point to the filname structure's result
> member for holding it's name, fix this by using memcpy to copy the
> filname structure pointer's, name to the char pointer passed to this
> function.
I don't understand what you're saying here. "the char pointer passed to
this function" is the source, not destination.
> Signed-off-by: Nicholas Krause <xerofoify@xxxxxxxxx>
> ---
> fs/namei.c | 1 +
> mm/early_ioremap.c | 1 +
> 2 files changed, 2 insertions(+)
>
> diff --git a/fs/namei.c b/fs/namei.c
> index c386a32..6b18d57 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -196,6 +196,7 @@ getname_flags(const char __user *filename, int flags, int *empty)
> }
> }
>
> + memcpy((char *)result->name, filename, len);
This will be wrong even with strncpy_from_user instead of memcpy. AFAICS
result->name already points to a copy of filename.
Also if you think that the above is "copy[ing] the filname structure
pointer's, name to the char pointer passed to this function" then you
are wrong.
> result->uptr = filename;
> result->aname = NULL;
> audit_getname(result);
> diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c
> index 6d5717b..92c5235 100644
> --- a/mm/early_ioremap.c
> +++ b/mm/early_ioremap.c
> @@ -215,6 +215,7 @@ early_ioremap(resource_size_t phys_addr, unsigned long size)
> void __init *
> early_memremap(resource_size_t phys_addr, unsigned long size)
> {
> + dump_stack();
> return (__force void *)__early_ioremap(phys_addr, size,
> FIXMAP_PAGE_NORMAL);
> }
>
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