From:Suzuki K. Poulose <suz...@in.ibm.com>
fill_psinfo() fills the NT_PRPSINFO note for the core. NT_PRPSINFO stores the
command line of the process, which is stored at from mm->arg_start. Make
fill_psinfo reusable by supporting other tasks. Use access_process_vm() to read
the command line args for non-current task.
Signed-off-by: Suzuki K. Poulose <suz...@in.ibm.com>
---
fs/binfmt_elf.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 107bbd3..4eee017 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1222,9 +1222,21 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo,
struct task_struct *p,
len = mm->arg_end - mm->arg_start;
if (len >= ELF_PRARGSZ)
len = ELF_PRARGSZ-1;
- if (copy_from_user(&psinfo->pr_psargs,
- (const char __user *)mm->arg_start, len))
- return -EFAULT;
+ /*
+ * If we are dumping core for "another task"
+ * we can't use copy_from_user().
+ */
+ if (p->mm == current->mm) {
+ if (copy_from_user(&psinfo->pr_psargs,
+ (const char __user *)mm->arg_start, len))
+ return -EFAULT;
+ } else {
+ int bytes = access_process_vm(p, mm->arg_start,
+ &psinfo->pr_psargs, len, 0);
+ if (bytes != len)
+ return -EFAULT;
+ }
+
for(i = 0; i < len; i++)
if (psinfo->pr_psargs[i] == 0)
psinfo->pr_psargs[i] = ' ';
--
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