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authorStephen Wilson <wilsons@start.ca>2011-03-13 15:49:21 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-23 16:36:58 -0400
commit26947f8c8f9598209001cdcd31bb2162a2e54691 (patch)
treebab014e7ad404ca3e36ae650f170f02df05705cd /fs
parent5ddd36b9c59887c6416e21daf984fbdd9b1818df (diff)
proc: disable mem_write after exec
This change makes mem_write() observe the same constraints as mem_read(). This is particularly important for mem_write as an accidental leak of the fd across an exec could result in arbitrary modification of the target process' memory. IOW, /proc/pid/mem is implicitly close-on-exec. Signed-off-by: Stephen Wilson <wilsons@start.ca> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/proc/base.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index e94b58b496f1..9af49a3984f1 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -850,6 +850,10 @@ static ssize_t mem_write(struct file * file, const char __user *buf,
if (check_mem_permission(task))
goto out;
+ copied = -EIO;
+ if (file->private_data != (void *)((long)current->self_exec_id))
+ goto out;
+
copied = -ENOMEM;
page = (char *)__get_free_page(GFP_TEMPORARY);
if (!page)