On Fri, Jun 5, 2015 at 8:51 AM, Navin P <navinp1912@gmail.com> wrote:
On Fri, Jun 5, 2015 at 3:49 AM, <Valdis.Kletnieks@vt.edu> wrote:
After all your perseverance , i have got what i wanted with 4 lines change on linux-4.0 fc22 :) I just made the proc cmdlines buffer size to a max of 100*4k. I hit the execve limit E2BIG when i had lot more more than 128000 but then i stopped beyond that. diff --git a/linux-4.0_orig/fs/proc/base.c b/linux-4.0/fs/proc/base.c index 3f3d7ae..06f19ee 100644 --- a/linux-4.0_orig/fs/proc/base.c +++ b/linux-4.0/fs/proc/base.c @@ -204,7 +204,7 @@ static int proc_pid_cmdline(struct seq_file *m, struct pid_namespace *ns, * per internal buffer allocation. See single_open(), traverse(). */ BUG_ON(m->size < PAGE_SIZE); - m->count += get_cmdline(task, m->buf, PAGE_SIZE); + m->count += get_cmdline(task, m->buf, 100*PAGE_SIZE); return 0; } @@ -2166,7 +2166,7 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, if (!task) goto out_no_task; if (count > PAGE_SIZE) - count = PAGE_SIZE; + count = 100*PAGE_SIZE; /* No partial writes. */ length = -EINVAL; diff --git a/linux-4.0_orig/fs/seq_file.c b/linux-4.0/fs/seq_file.c index 555f821..047d13e 100644 --- a/linux-4.0_orig/fs/seq_file.c +++ b/linux-4.0/fs/seq_file.c @@ -101,7 +101,7 @@ static int traverse(struct seq_file *m, loff_t offset) return 0; } if (!m->buf) { - m->buf = seq_buf_alloc(m->size = PAGE_SIZE); + m->buf = seq_buf_alloc(m->size = (100*PAGE_SIZE)); if (!m->buf) return -ENOMEM; } @@ -197,7 +197,7 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) /* grab buffer if we didn't have one */ if (!m->buf) { - m->buf = seq_buf_alloc(m->size = PAGE_SIZE); + m->buf = seq_buf_alloc(m->size = (100*PAGE_SIZE)); if (!m->buf) goto Enomem; } Thanks.