diff options
| author | Michael Bestas <mkbestas@lineageos.org> | 2020-11-15 21:52:06 +0200 |
|---|---|---|
| committer | Michael Bestas <mkbestas@lineageos.org> | 2020-11-15 21:52:18 +0200 |
| commit | 6107aa6dc24cc8c196bb18e5b5ec81f8f1a275a8 (patch) | |
| tree | ef508ed8340c5d6b615c713d1569d851964091f2 /fs/proc/kcore.c | |
| parent | 298504ed68065a61d0fc1d7969af19ecf2136ac9 (diff) | |
| parent | 34b1d1174c2c7054c01cfa39d274421d80649386 (diff) | |
Merge branch 'android-4.4-p' of https://android.googlesource.com/kernel/common into lineage-17.1-caf-msm8998
This brings LA.UM.8.2.r1-07400-sdm660.0 up to date with
https://android.googlesource.com/kernel/common/ android-4.4-p at commit:
34b1d1174c2c7 UPSTREAM: arm64: kaslr: Fix up the kernel image alignment
Conflicts:
scripts/setlocalversion
Change-Id: Id2981587a6e92eb10cfdc9b6d13cd4bd2abb5670
Diffstat (limited to 'fs/proc/kcore.c')
| -rw-r--r-- | fs/proc/kcore.c | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c index 21f198aa0961..107db4f559e0 100644 --- a/fs/proc/kcore.c +++ b/fs/proc/kcore.c @@ -507,23 +507,15 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos) return -EFAULT; } else { if (kern_addr_valid(start)) { - unsigned long n; - /* * Using bounce buffer to bypass the * hardened user copy kernel text checks. */ - memcpy(buf, (char *) start, tsz); - n = copy_to_user(buffer, buf, tsz); - /* - * We cannot distinguish between fault on source - * and fault on destination. When this happens - * we clear too and hope it will trigger the - * EFAULT again. - */ - if (n) { - if (clear_user(buffer + tsz - n, - n)) + if (probe_kernel_read(buf, (void *) start, tsz)) { + if (clear_user(buffer, tsz)) + return -EFAULT; + } else { + if (copy_to_user(buffer, buf, tsz)) return -EFAULT; } } else { |