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authorLinus Torvalds <torvalds@linux-foundation.org>2020-04-03 11:26:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-03 11:26:32 -0700
commitf2c3bec3c90df7a68bc24924426ff59183e028a3 (patch)
treec0c3d93bf2687b4e1e64ca543793ab32875894ca /kernel
parenta943353d170e286dd3d877ac5aa15c1034cdfefc (diff)
parentad99b5105c0823ff02126497f4366e6a8009453e (diff)
Merge tag 'kgdb-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux
Pull kgdb updates from Daniel Thompson: "Pretty quiet this cycle. Just a couple of small fixes from myself both of which were reviewed by Doug Anderson to keep me honest (thanks)" * tag 'kgdb-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux: kdb: Censor attempts to set PROMPT without ENABLE_MEM_READ kdb: Eliminate strncpy() warnings by replacing with strscpy()
Diffstat (limited to 'kernel')
-rw-r--r--kernel/debug/kdb/kdb_main.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index ba12e9f4661e..515379cbf209 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -399,6 +399,13 @@ int kdb_set(int argc, const char **argv)
return KDB_ARGCOUNT;
/*
+ * Censor sensitive variables
+ */
+ if (strcmp(argv[1], "PROMPT") == 0 &&
+ !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false))
+ return KDB_NOPERM;
+
+ /*
* Check for internal variables
*/
if (strcmp(argv[1], "KDBDEBUG") == 0) {
@@ -1102,12 +1109,12 @@ static int handle_ctrl_cmd(char *cmd)
case CTRL_P:
if (cmdptr != cmd_tail)
cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
- strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
+ strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
return 1;
case CTRL_N:
if (cmdptr != cmd_head)
cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
- strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
+ strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
return 1;
}
return 0;
@@ -1298,12 +1305,9 @@ static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
*(cmd_hist[cmd_head]) = '\0';
do_full_getstr:
-#if defined(CONFIG_SMP)
+ /* PROMPT can only be set if we have MEM_READ permission. */
snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
raw_smp_processor_id());
-#else
- snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
-#endif
if (defcmd_in_progress)
strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
@@ -1314,7 +1318,7 @@ do_full_getstr:
if (*cmdbuf != '\n') {
if (*cmdbuf < 32) {
if (cmdptr == cmd_head) {
- strncpy(cmd_hist[cmd_head], cmd_cur,
+ strscpy(cmd_hist[cmd_head], cmd_cur,
CMD_BUFLEN);
*(cmd_hist[cmd_head] +
strlen(cmd_hist[cmd_head])-1) = '\0';
@@ -1324,7 +1328,7 @@ do_full_getstr:
cmdbuf = cmd_cur;
goto do_full_getstr;
} else {
- strncpy(cmd_hist[cmd_head], cmd_cur,
+ strscpy(cmd_hist[cmd_head], cmd_cur,
CMD_BUFLEN);
}