* [PATCH] x86/spectre: fix an error message
@ 2018-02-14 7:14 ` Dan Carpenter
0 siblings, 0 replies; 6+ messages in thread
From: Dan Carpenter @ 2018-02-14 7:14 UTC (permalink / raw)
To: Ingo Molnar, KarimAllah Ahmed
Cc: H. Peter Anvin, x86, Thomas Gleixner, David Woodhouse,
Borislav Petkov, Greg Kroah-Hartman, Andy Lutomirski,
linux-kernel, kernel-janitors
If i = ARRAY_SIZE(mitigation_options) then we accidentally print
garbage from one space beyond the end of the mitigation_options[] array.
Fixes: 9005c6834c0f ("x86/spectre: Simplify spectre_v2 command line parsing")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index debcdda88560..acee4ebec04f 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -174,7 +174,7 @@ static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void)
}
if (i >= ARRAY_SIZE(mitigation_options)) {
- pr_err("unknown option (%s). Switching to AUTO select\n", mitigation_options[i].option);
+ pr_err("unknown option (%s). Switching to AUTO select\n", arg);
return SPECTRE_V2_CMD_AUTO;
}
}
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH] x86/spectre: fix an error message
2018-02-14 7:14 ` Dan Carpenter
@ 2018-02-14 7:21 ` Joe Perches
-1 siblings, 0 replies; 6+ messages in thread
From: Joe Perches @ 2018-02-14 7:21 UTC (permalink / raw)
To: Dan Carpenter, Ingo Molnar, KarimAllah Ahmed
Cc: H. Peter Anvin, x86, Thomas Gleixner, David Woodhouse,
Borislav Petkov, Greg Kroah-Hartman, Andy Lutomirski,
linux-kernel, kernel-janitors
On Wed, 2018-02-14 at 10:14 +0300, Dan Carpenter wrote:
> If i == ARRAY_SIZE(mitigation_options) then we accidentally print
> garbage from one space beyond the end of the mitigation_options[] array.
>
> Fixes: 9005c6834c0f ("x86/spectre: Simplify spectre_v2 command line parsing")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
> index debcdda88560..acee4ebec04f 100644
> --- a/arch/x86/kernel/cpu/bugs.c
> +++ b/arch/x86/kernel/cpu/bugs.c
> @@ -174,7 +174,7 @@ static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void)
> }
>
> if (i >= ARRAY_SIZE(mitigation_options)) {
> - pr_err("unknown option (%s). Switching to AUTO select\n", mitigation_options[i].option);
> + pr_err("unknown option (%s). Switching to AUTO select\n", arg);
> return SPECTRE_V2_CMD_AUTO;
> }
> }
Should probably unindent this block too by
removing the else after the return
---
arch/x86/kernel/cpu/bugs.c | 29 ++++++++++++++---------------
1 file changed, 14 insertions(+), 15 deletions(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 4acf16a76d1e..0af8245afb6c 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -161,22 +161,21 @@ static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void)
if (cmdline_find_option_bool(boot_command_line, "nospectre_v2"))
return SPECTRE_V2_CMD_NONE;
- else {
- ret = cmdline_find_option(boot_command_line, "spectre_v2", arg, sizeof(arg));
- if (ret < 0)
- return SPECTRE_V2_CMD_AUTO;
-
- for (i = 0; i < ARRAY_SIZE(mitigation_options); i++) {
- if (!match_option(arg, ret, mitigation_options[i].option))
- continue;
- cmd = mitigation_options[i].cmd;
- break;
- }
- if (i >= ARRAY_SIZE(mitigation_options)) {
- pr_err("unknown option (%s). Switching to AUTO select\n", mitigation_options[i].option);
- return SPECTRE_V2_CMD_AUTO;
- }
+ ret = cmdline_find_option(boot_command_line, "spectre_v2", arg, sizeof(arg));
+ if (ret < 0)
+ return SPECTRE_V2_CMD_AUTO;
+
+ for (i = 0; i < ARRAY_SIZE(mitigation_options); i++) {
+ if (!match_option(arg, ret, mitigation_options[i].option))
+ continue;
+ cmd = mitigation_options[i].cmd;
+ break;
+ }
+
+ if (i >= ARRAY_SIZE(mitigation_options)) {
+ pr_err("unknown option (%s). Switching to AUTO select\n", arg);
+ return SPECTRE_V2_CMD_AUTO;
}
if ((cmd == SPECTRE_V2_CMD_RETPOLINE ||
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH] x86/spectre: fix an error message
@ 2018-02-14 7:21 ` Joe Perches
0 siblings, 0 replies; 6+ messages in thread
From: Joe Perches @ 2018-02-14 7:21 UTC (permalink / raw)
To: Dan Carpenter, Ingo Molnar, KarimAllah Ahmed
Cc: H. Peter Anvin, x86, Thomas Gleixner, David Woodhouse,
Borislav Petkov, Greg Kroah-Hartman, Andy Lutomirski,
linux-kernel, kernel-janitors
On Wed, 2018-02-14 at 10:14 +0300, Dan Carpenter wrote:
> If i = ARRAY_SIZE(mitigation_options) then we accidentally print
> garbage from one space beyond the end of the mitigation_options[] array.
>
> Fixes: 9005c6834c0f ("x86/spectre: Simplify spectre_v2 command line parsing")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
> index debcdda88560..acee4ebec04f 100644
> --- a/arch/x86/kernel/cpu/bugs.c
> +++ b/arch/x86/kernel/cpu/bugs.c
> @@ -174,7 +174,7 @@ static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void)
> }
>
> if (i >= ARRAY_SIZE(mitigation_options)) {
> - pr_err("unknown option (%s). Switching to AUTO select\n", mitigation_options[i].option);
> + pr_err("unknown option (%s). Switching to AUTO select\n", arg);
> return SPECTRE_V2_CMD_AUTO;
> }
> }
Should probably unindent this block too by
removing the else after the return
---
arch/x86/kernel/cpu/bugs.c | 29 ++++++++++++++---------------
1 file changed, 14 insertions(+), 15 deletions(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 4acf16a76d1e..0af8245afb6c 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -161,22 +161,21 @@ static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void)
if (cmdline_find_option_bool(boot_command_line, "nospectre_v2"))
return SPECTRE_V2_CMD_NONE;
- else {
- ret = cmdline_find_option(boot_command_line, "spectre_v2", arg, sizeof(arg));
- if (ret < 0)
- return SPECTRE_V2_CMD_AUTO;
-
- for (i = 0; i < ARRAY_SIZE(mitigation_options); i++) {
- if (!match_option(arg, ret, mitigation_options[i].option))
- continue;
- cmd = mitigation_options[i].cmd;
- break;
- }
- if (i >= ARRAY_SIZE(mitigation_options)) {
- pr_err("unknown option (%s). Switching to AUTO select\n", mitigation_options[i].option);
- return SPECTRE_V2_CMD_AUTO;
- }
+ ret = cmdline_find_option(boot_command_line, "spectre_v2", arg, sizeof(arg));
+ if (ret < 0)
+ return SPECTRE_V2_CMD_AUTO;
+
+ for (i = 0; i < ARRAY_SIZE(mitigation_options); i++) {
+ if (!match_option(arg, ret, mitigation_options[i].option))
+ continue;
+ cmd = mitigation_options[i].cmd;
+ break;
+ }
+
+ if (i >= ARRAY_SIZE(mitigation_options)) {
+ pr_err("unknown option (%s). Switching to AUTO select\n", arg);
+ return SPECTRE_V2_CMD_AUTO;
}
if ((cmd = SPECTRE_V2_CMD_RETPOLINE ||
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [tip:x86/pti] x86/spectre: Fix an error message
2018-02-14 7:14 ` Dan Carpenter
(?)
(?)
@ 2018-02-14 8:36 ` tip-bot for Dan Carpenter
-1 siblings, 0 replies; 6+ messages in thread
From: tip-bot for Dan Carpenter @ 2018-02-14 8:36 UTC (permalink / raw)
To: linux-tip-commits
Cc: torvalds, mingo, peterz, karahmed, bp, hpa, gregkh, luto,
dan.carpenter, tglx, dwmw, linux-kernel
Commit-ID: b4764623932ff364df9a6bc8664ab7697c475339
Gitweb: https://git.kernel.org/tip/b4764623932ff364df9a6bc8664ab7697c475339
Author: Dan Carpenter <dan.carpenter@oracle.com>
AuthorDate: Wed, 14 Feb 2018 10:14:17 +0300
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 14 Feb 2018 08:23:07 +0100
x86/spectre: Fix an error message
If i == ARRAY_SIZE(mitigation_options) then we accidentally print
garbage from one space beyond the end of the mitigation_options[] array.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: KarimAllah Ahmed <karahmed@amazon.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-janitors@vger.kernel.org
Fixes: 9005c6834c0f ("x86/spectre: Simplify spectre_v2 command line parsing")
Link: http://lkml.kernel.org/r/20180214071416.GA26677@mwanda
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/cpu/bugs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 4acf16a..d71c8b5 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -174,7 +174,7 @@ static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void)
}
if (i >= ARRAY_SIZE(mitigation_options)) {
- pr_err("unknown option (%s). Switching to AUTO select\n", mitigation_options[i].option);
+ pr_err("unknown option (%s). Switching to AUTO select\n", arg);
return SPECTRE_V2_CMD_AUTO;
}
}
^ permalink raw reply related [flat|nested] 6+ messages in thread* [tip:x86/pti] x86/spectre: Fix an error message
2018-02-14 7:14 ` Dan Carpenter
` (2 preceding siblings ...)
(?)
@ 2018-02-15 0:30 ` tip-bot for Dan Carpenter
-1 siblings, 0 replies; 6+ messages in thread
From: tip-bot for Dan Carpenter @ 2018-02-15 0:30 UTC (permalink / raw)
To: linux-tip-commits
Cc: hpa, gregkh, peterz, mingo, tglx, bp, karahmed, dwmw,
dan.carpenter, linux-kernel, torvalds, luto
Commit-ID: 9de29eac8d2189424d81c0d840cd0469aa3d41c8
Gitweb: https://git.kernel.org/tip/9de29eac8d2189424d81c0d840cd0469aa3d41c8
Author: Dan Carpenter <dan.carpenter@oracle.com>
AuthorDate: Wed, 14 Feb 2018 10:14:17 +0300
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 15 Feb 2018 01:15:53 +0100
x86/spectre: Fix an error message
If i == ARRAY_SIZE(mitigation_options) then we accidentally print
garbage from one space beyond the end of the mitigation_options[] array.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: KarimAllah Ahmed <karahmed@amazon.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-janitors@vger.kernel.org
Fixes: 9005c6834c0f ("x86/spectre: Simplify spectre_v2 command line parsing")
Link: http://lkml.kernel.org/r/20180214071416.GA26677@mwanda
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/cpu/bugs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 4acf16a..d71c8b5 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -174,7 +174,7 @@ static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void)
}
if (i >= ARRAY_SIZE(mitigation_options)) {
- pr_err("unknown option (%s). Switching to AUTO select\n", mitigation_options[i].option);
+ pr_err("unknown option (%s). Switching to AUTO select\n", arg);
return SPECTRE_V2_CMD_AUTO;
}
}
^ permalink raw reply related [flat|nested] 6+ messages in thread