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authorKees Cook <keescook@chromium.org>2020-07-02 21:49:23 +0300
committerKees Cook <keescook@chromium.org>2020-07-09 01:59:57 +0300
commit160251842cd35a75edfb0a1d76afa3eb674ff40a (patch)
treea1ce82f3b8d23a325c151bd998b815af9574617c /kernel/kprobes.c
parent48778464bb7d346b47157d21ffde2af6b2d39110 (diff)
downloadlinux-160251842cd35a75edfb0a1d76afa3eb674ff40a.tar.xz
kallsyms: Refactor kallsyms_show_value() to take cred
In order to perform future tests against the cred saved during open(), switch kallsyms_show_value() to operate on a cred, and have all current callers pass current_cred(). This makes it very obvious where callers are checking the wrong credential in their "read" contexts. These will be fixed in the coming patches. Additionally switch return value to bool, since it is always used as a direct permission check, not a 0-on-success, negative-on-error style function return. Cc: stable@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 4a904cc56d68..d4de217e4a91 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -2448,7 +2448,7 @@ static void report_probe(struct seq_file *pi, struct kprobe *p,
else
kprobe_type = "k";
- if (!kallsyms_show_value())
+ if (!kallsyms_show_value(current_cred()))
addr = NULL;
if (sym)
@@ -2540,7 +2540,7 @@ static int kprobe_blacklist_seq_show(struct seq_file *m, void *v)
* If /proc/kallsyms is not showing kernel address, we won't
* show them here either.
*/
- if (!kallsyms_show_value())
+ if (!kallsyms_show_value(current_cred()))
seq_printf(m, "0x%px-0x%px\t%ps\n", NULL, NULL,
(void *)ent->start_addr);
else