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SubjectRe: [PATCH v3] vmcore: prevent PT_NOTE p_memsz overflow during header update
On Wed, Feb 05, 2014 at 04:39:05PM +0000, Pearson, Greg wrote:
> On 02/05/2014 06:39 AM, Vivek Goyal wrote:
> > On Tue, Feb 04, 2014 at 04:25:52PM -0700, Greg Pearson wrote:
> >
> > [..]
> >> diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
> >> index 2ca7ba0..88d4585 100644
> >> --- a/fs/proc/vmcore.c
> >> +++ b/fs/proc/vmcore.c
> >> @@ -468,17 +468,24 @@ static int __init update_note_header_size_elf64(const Elf64_Ehdr *ehdr_ptr)
> >> return rc;
> >> }
> >> nhdr_ptr = notes_section;
> >> - while (real_sz < max_sz) {
> >> - if (nhdr_ptr->n_namesz == 0)
> >> - break;
> >> + while (nhdr_ptr->n_namesz != 0) {
> >> sz = sizeof(Elf64_Nhdr) +
> >> ((nhdr_ptr->n_namesz + 3) & ~3) +
> >> ((nhdr_ptr->n_descsz + 3) & ~3);
> >> + if ((real_sz + sz) > max_sz) {
> >> + pr_warn("Warning: Exceeded p_memsz, dropping PT_NOTE entry n_namesz=0x%x, n_descsz=0x%x\n",
> >> + nhdr_ptr->n_namesz, nhdr_ptr->n_descsz);
> > You will need line break in pr_warn(). Too long a line. Limit it 80
> > columns per line.
>
> The checkpatch.pl script issues a warning when you break quoted strings,
> I have no personal preference. Just let me know if you want me to ignore
> the checkpatch warning and conform to the 80 column per line limit.

Hmm.., I am reading CodingStyle and it does say that do not break user
visible strings as it breaks ability to grep these.

"However, never break user-visible strings such as
printk messages, because that breaks the ability to grep for them."

Ok, so I am fine with this patch.

Acked-by: Vivek Goyal <vgoyal@redhat.com>

Thanks
Vivek


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