Commit 1700f82d authored by Du, Changbin's avatar Du, Changbin Committed by Greg Kroah-Hartman

scripts/gdb: fix lx-version string output

[ Upstream commit b058809b ]

A bug is present in GDB which causes early string termination when
parsing variables.  This has been reported [0], but we should ensure
that we can support at least basic printing of the core kernel strings.

For current gdb version (has been tested with 7.3 and 8.1), 'lx-version'
only prints one character.

  (gdb) lx-version

This can be fixed by casting 'linux_banner' as (char *).

  (gdb) lx-version
  Linux version 4.19.0-rc1+ (changbin@acer) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #21 SMP Sat Sep 1 21:43:30 CST 2018


[ add detail to commit message]
Fixes: 2d061d99 ("scripts/gdb: add version command")
Signed-off-by: Du, Changbin's avatarDu Changbin <>
Signed-off-by: 's avatarKieran Bingham <>
Acked-by: Jan Kiszka's avatarJan Kiszka <>
Cc: Jan Kiszka <>
Cc: Jason Wessel <>
Cc: Daniel Thompson <>
Signed-off-by: 's avatarAndrew Morton <>
Signed-off-by: 's avatarLinus Torvalds <>
Signed-off-by: 's avatarSasha Levin <>
parent 563d8985
......@@ -41,7 +41,7 @@ class LxVersion(gdb.Command):
def invoke(self, arg, from_tty):
# linux_banner should contain a newline
gdb.write(gdb.parse_and_eval("(char *)linux_banner").string())
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