[PATCH v2] misc/fsck.c: Processes may kill other processes.

[PATCH v2] misc/fsck.c: Processes may kill other processes.

[zhanchengbin]

I find a error in misc/fsck.c, if run the fsck -N command, processes
don't execute, just show what would be done. However, the pid whose
value is -1 is added to the instance_list list in the execute
function,if the kill_all function is called later, kill(-1, signum)
is executed, Signals are sent to all processes except the number one
process and itself. Other processes will be killed if they use the
default signal processing function.

Signed-off-by: zhanchengbin <zhanchengbin1@huawei.com>
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
---
V1->V2:
   Anything <= 0 is a bug and can have unexpected consequences if
we actually call the kill(). So change inst->pid==-1 to inst->pid<=0.

  misc/fsck.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/misc/fsck.c b/misc/fsck.c
index 4efe10ec..c56d1b00 100644
--- a/misc/fsck.c
+++ b/misc/fsck.c
@@ -546,6 +546,8 @@ static int kill_all(int signum)
  	for (inst = instance_list; inst; inst = inst->next) {
  		if (inst->flags & FLAG_DONE)
  			continue;
+		if (inst->pid <= 0)
+			continue;
  		kill(inst->pid, signum);
  		n++;
  	}
-- 
2.27.0

Re: [PATCH v2] misc/fsck.c: Processes may kill other processes.

[Lukas Czerner]

On Mon, Oct 10, 2022 at 04:56:58PM +0800, zhanchengbin wrote:
> I find a error in misc/fsck.c, if run the fsck -N command, processes
> don't execute, just show what would be done. However, the pid whose
> value is -1 is added to the instance_list list in the execute
> function,if the kill_all function is called later, kill(-1, signum)
> is executed, Signals are sent to all processes except the number one
> process and itself. Other processes will be killed if they use the
> default signal processing function.

Looks good thanks.

> 
> Signed-off-by: zhanchengbin <zhanchengbin1@huawei.com>
> Signed-off-by: Lukas Czerner <lczerner@redhat.com>
                  ^^^
You can remove my Sob, but you can add

Reviewed-by: Lukas Czerner <lczerner@redhat.com>

Thanks!
-Lukas

> ---
> V1->V2:
>   Anything <= 0 is a bug and can have unexpected consequences if
> we actually call the kill(). So change inst->pid==-1 to inst->pid<=0.
> 
>  misc/fsck.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/misc/fsck.c b/misc/fsck.c
> index 4efe10ec..c56d1b00 100644
> --- a/misc/fsck.c
> +++ b/misc/fsck.c
> @@ -546,6 +546,8 @@ static int kill_all(int signum)
>  	for (inst = instance_list; inst; inst = inst->next) {
>  		if (inst->flags & FLAG_DONE)
>  			continue;
> +		if (inst->pid <= 0)
> +			continue;
>  		kill(inst->pid, signum);
>  		n++;
>  	}
> -- 
> 2.27.0
> 

Re: [PATCH v2] misc/fsck.c: Processes may kill other processes.

[Darrick J. Wong]

On Mon, Oct 10, 2022 at 04:56:58PM +0800, zhanchengbin wrote:
> I find a error in misc/fsck.c, if run the fsck -N command, processes
> don't execute, just show what would be done. However, the pid whose
> value is -1 is added to the instance_list list in the execute
> function,if the kill_all function is called later, kill(-1, signum)
> is executed, Signals are sent to all processes except the number one
> process and itself. Other processes will be killed if they use the
> default signal processing function.
> 
> Signed-off-by: zhanchengbin <zhanchengbin1@huawei.com>
> Signed-off-by: Lukas Czerner <lczerner@redhat.com>

Looks good to me,
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

Ted: Perhaps it's time to retire fsck.c in the e2fsprogs distribution?

--D

> ---
> V1->V2:
>   Anything <= 0 is a bug and can have unexpected consequences if
> we actually call the kill(). So change inst->pid==-1 to inst->pid<=0.
> 
>  misc/fsck.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/misc/fsck.c b/misc/fsck.c
> index 4efe10ec..c56d1b00 100644
> --- a/misc/fsck.c
> +++ b/misc/fsck.c
> @@ -546,6 +546,8 @@ static int kill_all(int signum)
>  	for (inst = instance_list; inst; inst = inst->next) {
>  		if (inst->flags & FLAG_DONE)
>  			continue;
> +		if (inst->pid <= 0)
> +			continue;
>  		kill(inst->pid, signum);
>  		n++;
>  	}
> -- 
> 2.27.0
> 

Re: [PATCH v2] misc/fsck.c: Processes may kill other processes.

[Zhiqiang Liu]

On 2022/10/10 16:56, zhanchengbin wrote:
> I find a error in misc/fsck.c, if run the fsck -N command, processes
> don't execute, just show what would be done. However, the pid whose
> value is -1 is added to the instance_list list in the execute
> function,if the kill_all function is called later, kill(-1, signum)
> is executed, Signals are sent to all processes except the number one
> process and itself. Other processes will be killed if they use the
> default signal processing function.
> 
Looks good to me,
Reviewed-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
> Signed-off-by: zhanchengbin <zhanchengbin1@huawei.com>
> Signed-off-by: Lukas Czerner <lczerner@redhat.com>
> ---
> V1->V2:
>   Anything <= 0 is a bug and can have unexpected consequences if
> we actually call the kill(). So change inst->pid==-1 to inst->pid<=0.
> 
>  misc/fsck.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/misc/fsck.c b/misc/fsck.c
> index 4efe10ec..c56d1b00 100644
> --- a/misc/fsck.c
> +++ b/misc/fsck.c
> @@ -546,6 +546,8 @@ static int kill_all(int signum)
>      for (inst = instance_list; inst; inst = inst->next) {
>          if (inst->flags & FLAG_DONE)
>              continue;
> +        if (inst->pid <= 0)
> +            continue;
>          kill(inst->pid, signum);
>          n++;
>      }

Re: [PATCH v2] misc/fsck.c: Processes may kill other processes.

[zhanchengbin]

friendly ping, thanks.

On 2022/10/10 16:56, zhanchengbin wrote:
> I find a error in misc/fsck.c, if run the fsck -N command, processes
> don't execute, just show what would be done. However, the pid whose
> value is -1 is added to the instance_list list in the execute
> function,if the kill_all function is called later, kill(-1, signum)
> is executed, Signals are sent to all processes except the number one
> process and itself. Other processes will be killed if they use the
> default signal processing function.
> 
> Signed-off-by: zhanchengbin <zhanchengbin1@huawei.com>
> Signed-off-by: Lukas Czerner <lczerner@redhat.com>
> ---
> V1->V2:
>    Anything <= 0 is a bug and can have unexpected consequences if
> we actually call the kill(). So change inst->pid==-1 to inst->pid<=0.
> 
>   misc/fsck.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/misc/fsck.c b/misc/fsck.c
> index 4efe10ec..c56d1b00 100644
> --- a/misc/fsck.c
> +++ b/misc/fsck.c
> @@ -546,6 +546,8 @@ static int kill_all(int signum)
>       for (inst = instance_list; inst; inst = inst->next) {
>           if (inst->flags & FLAG_DONE)
>               continue;
> +        if (inst->pid <= 0)
> +            continue;
>           kill(inst->pid, signum);
>           n++;
>       }

Re: [PATCH v2] misc/fsck.c: Processes may kill other processes.

[zhanchengbin]

ping...

On 2022/10/10 16:56, zhanchengbin wrote:
> I find a error in misc/fsck.c, if run the fsck -N command, processes
> don't execute, just show what would be done. However, the pid whose
> value is -1 is added to the instance_list list in the execute
> function,if the kill_all function is called later, kill(-1, signum)
> is executed, Signals are sent to all processes except the number one
> process and itself. Other processes will be killed if they use the
> default signal processing function.
> 
> Signed-off-by: zhanchengbin <zhanchengbin1@huawei.com>
> Signed-off-by: Lukas Czerner <lczerner@redhat.com>
> ---
> V1->V2:
>    Anything <= 0 is a bug and can have unexpected consequences if
> we actually call the kill(). So change inst->pid==-1 to inst->pid<=0.
> 
>   misc/fsck.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/misc/fsck.c b/misc/fsck.c
> index 4efe10ec..c56d1b00 100644
> --- a/misc/fsck.c
> +++ b/misc/fsck.c
> @@ -546,6 +546,8 @@ static int kill_all(int signum)
>       for (inst = instance_list; inst; inst = inst->next) {
>           if (inst->flags & FLAG_DONE)
>               continue;
> +        if (inst->pid <= 0)
> +            continue;
>           kill(inst->pid, signum);
>           n++;
>       }

Re: [PATCH v2] misc/fsck.c: Processes may kill other processes.

[Theodore Ts'o]

On Mon, 10 Oct 2022 16:56:58 +0800, zhanchengbin wrote:
> I find a error in misc/fsck.c, if run the fsck -N command, processes
> don't execute, just show what would be done. However, the pid whose
> value is -1 is added to the instance_list list in the execute
> function,if the kill_all function is called later, kill(-1, signum)
> is executed, Signals are sent to all processes except the number one
> process and itself. Other processes will be killed if they use the
> default signal processing function.
> 
> [...]

Applied, thanks!

[1/1] misc/fsck.c: Processes may kill other processes.
      commit: d08ef863feae14e4710bf2026404e6c6e06db2be

Best regards,
-- 
Theodore Ts'o <tytso@mit.edu>