4.20-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit b058809bfc8faeb7b7cae047666e23375a060059 ]
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 L(gdb)
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
[0] https://sourceware.org/bugzilla/show_bug.cgi?id=20077
[kbingham@kernel.org: add detail to commit message] Link: http://lkml.kernel.org/r/20181111162035.8356-1-kieran.bingham@ideasonboard.c... Fixes: 2d061d999424 ("scripts/gdb: add version command") Signed-off-by: Du Changbin changbin.du@gmail.com Signed-off-by: Kieran Bingham kbingham@kernel.org Acked-by: Jan Kiszka jan.kiszka@siemens.com Cc: Jan Kiszka jan.kiszka@siemens.com Cc: Jason Wessel jason.wessel@windriver.com Cc: Daniel Thompson daniel.thompson@linaro.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- scripts/gdb/linux/proc.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py index 086d27223c0c..0aebd7565b03 100644 --- a/scripts/gdb/linux/proc.py +++ b/scripts/gdb/linux/proc.py @@ -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("linux_banner").string()) + gdb.write(gdb.parse_and_eval("(char *)linux_banner").string())
LxVersion()