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authorMarcelo Henrique Cerri <marcelo.cerri@canonical.com>2021-06-30 18:54:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-01 11:06:04 -0700
commitd238692b4b9f2c36e35af4c6e6f6da36184aeb3e (patch)
treef90270ab0e3aa06229cc48ef6f75fa3b5f57078d /fs/proc
parent8f187163eb890d6d2a53f7efea2b6963fe9526e2 (diff)
proc: Avoid mixing integer types in mem_rw()
Use size_t when capping the count argument received by mem_rw(). Since count is size_t, using min_t(int, ...) can lead to a negative value that will later be passed to access_remote_vm(), which can cause unexpected behavior. Since we are capping the value to at maximum PAGE_SIZE, the conversion from size_t to int when passing it to access_remote_vm() as "len" shouldn't be a problem. Link: https://lkml.kernel.org/r/20210512125215.3348316-1-marcelo.cerri@canonical.com Reviewed-by: David Disseldorp <ddiss@suse.de> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Souza Cascardo <cascardo@canonical.com> Cc: Christian Brauner <christian.brauner@ubuntu.com> Cc: Michel Lespinasse <walken@google.com> Cc: Helge Deller <deller@gmx.de> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Lorenzo Stoakes <lstoakes@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 9cbd915025ad..a0a2fc1c9da2 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -854,7 +854,7 @@ static ssize_t mem_rw(struct file *file, char __user *buf,
flags = FOLL_FORCE | (write ? FOLL_WRITE : 0);
while (count > 0) {
- int this_len = min_t(int, count, PAGE_SIZE);
+ size_t this_len = min_t(size_t, count, PAGE_SIZE);
if (write && copy_from_user(page, buf, this_len)) {
copied = -EFAULT;