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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-03 11:26:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-03 11:26:32 -0700 |
| commit | f2c3bec3c90df7a68bc24924426ff59183e028a3 (patch) | |
| tree | c0c3d93bf2687b4e1e64ca543793ab32875894ca /kernel | |
| parent | Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm (diff) | |
| parent | kdb: Censor attempts to set PROMPT without ENABLE_MEM_READ (diff) | |
| download | linux-dev-f2c3bec3c90df7a68bc24924426ff59183e028a3.tar.xz linux-dev-f2c3bec3c90df7a68bc24924426ff59183e028a3.zip | |
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.c | 20 |
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); } |