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From: Siddhesh Poyarekar <siddhesh@sourceware.org>
To: Adhemerval Zanella <adhemerval.zanella@linaro.org>,
	libc-alpha@sourceware.org
Subject: Re: [PATCH v3 14/19] elf: Ignore loader debug env vars for setuid
Date: Mon, 20 Nov 2023 17:57:27 -0500	[thread overview]
Message-ID: <f399a463-4df7-4d98-98bd-e8e8a99bb0f0@sourceware.org> (raw)
In-Reply-To: <20231106202552.3404059-15-adhemerval.zanella@linaro.org>

On 2023-11-06 15:25, Adhemerval Zanella wrote:
> Loader already ignores LD_DEBUG, LD_DEBUG_OUTPUT, and
> LD_TRACE_LOADED_OBJECTS. Both LD_WARN and LD_VERBOSE are similar to
> LD_DEBUG, in the sense they enable additional checks and debug
> information, so it makes sense to disable them.
> 
> Checked on x86_64-linux-gnu.
> ---

Maybe also put it in unsecvars.h?

>   elf/rtld.c           | 22 ++++++++++++++--------
>   elf/tst-env-setuid.c |  2 ++
>   2 files changed, 16 insertions(+), 8 deletions(-)
> 
> diff --git a/elf/rtld.c b/elf/rtld.c
> index a09cf2a9df..e7f90d37e7 100644
> --- a/elf/rtld.c
> +++ b/elf/rtld.c
> @@ -2552,13 +2552,15 @@ process_envvars (struct dl_main_state *state)
>   	{
>   	case 4:
>   	  /* Warning level, verbose or not.  */
> -	  if (memcmp (envline, "WARN", 4) == 0)
> +	  if (!__libc_enable_secure
> +	      && memcmp (envline, "WARN", 4) == 0)
>   	    GLRO(dl_verbose) = envline[5] != '\0';
>   	  break;
>   
>   	case 5:
>   	  /* Debugging of the dynamic linker?  */
> -	  if (memcmp (envline, "DEBUG", 5) == 0)
> +	  if (!__libc_enable_secure
> +	      && memcmp (envline, "DEBUG", 5) == 0)
>   	    {
>   	      process_dl_debug (state, &envline[6]);
>   	      break;
> @@ -2569,7 +2571,8 @@ process_envvars (struct dl_main_state *state)
>   
>   	case 7:
>   	  /* Print information about versions.  */
> -	  if (memcmp (envline, "VERBOSE", 7) == 0)
> +	  if (!__libc_enable_secure
> +	      && memcmp (envline, "VERBOSE", 7) == 0)
>   	    {
>   	      state->version_info = envline[8] != '\0';
>   	      break;
> @@ -2625,7 +2628,8 @@ process_envvars (struct dl_main_state *state)
>   	    }
>   
>   	  /* Where to place the profiling data file.  */
> -	  if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0)
> +	  if (!__libc_enable_secure
> +	      && memcmp (envline, "DEBUG_OUTPUT", 12) == 0)
>   	    {
>   	      debug_output = &envline[13];
>   	      break;
> @@ -2646,7 +2650,8 @@ process_envvars (struct dl_main_state *state)
>   
>   	case 20:
>   	  /* The mode of the dynamic linker can be set.  */
> -	  if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0)
> +	  if (!__libc_enable_secure
> +	      && memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0)
>   	    {
>   	      state->mode = rtld_mode_trace;
>   	      state->mode_trace_program
> @@ -2668,9 +2673,10 @@ process_envvars (struct dl_main_state *state)
>   	}
>         while (*nextp != '\0');
>   
> -      GLRO(dl_debug_mask) = 0;
> -
> -      if (state->mode != rtld_mode_normal)
> +      if (GLRO(dl_debug_mask) != 0
> +	  || GLRO(dl_verbose) != 0
> +	  || state->mode != rtld_mode_normal
> +	  || state->version_info)
>   	_exit (5);
>       }
>     /* If we have to run the dynamic linker in debugging mode and the
> diff --git a/elf/tst-env-setuid.c b/elf/tst-env-setuid.c
> index 76b8e1fb45..dcf213a4cd 100644
> --- a/elf/tst-env-setuid.c
> +++ b/elf/tst-env-setuid.c
> @@ -59,6 +59,8 @@ static const struct envvar_t filtered_envvars[] =
>     { "MALLOC_TRACE",            FILTERED_VALUE },
>     { "MALLOC_TRIM_THRESHOLD_",  FILTERED_VALUE },
>     { "RES_OPTIONS",             FILTERED_VALUE },
> +  { "LD_DEBUG",                "all" },
> +  { "LD_DEBUG_OUTPUT",         "/tmp/some-file" },
>   };
>   
>   static const struct envvar_t unfiltered_envvars[] =

  reply	other threads:[~2023-11-20 22:57 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-06 20:25 [PATCH v3 00/19] Improve loader environment variable handling Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 01/19] elf: Remove /etc/suid-debug support Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 02/19] elf: Add GLIBC_TUNABLES to unsecvars Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 03/19] elf: Ignore GLIBC_TUNABLES for setuid/setgid binaries Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 04/19] elf: Add all malloc tunable to unsecvars Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 05/19] elf: Do not process invalid tunable format Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 06/19] elf: Do not parse ill-formatted strings Adhemerval Zanella
2023-11-20 21:48   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 07/19] elf: Fix _dl_debug_vdprintf to work before self-relocation Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 08/19] elf: Emit warning if tunable is ill-formatted Adhemerval Zanella
2023-11-20 21:50   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 09/19] x86: Use dl-symbol-redir-ifunc.h on cpu-tunables Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 10/19] s390: " Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 11/19] elf: Do not duplicate the GLIBC_TUNABLES string Adhemerval Zanella
2023-11-20 22:44   ` Siddhesh Poyarekar
2023-11-21 18:12     ` Adhemerval Zanella Netto
2023-11-22 11:39       ` Adhemerval Zanella Netto
2023-11-22 12:23       ` Siddhesh Poyarekar
2023-11-22 13:03         ` Adhemerval Zanella Netto
2023-11-22 13:24           ` Siddhesh Poyarekar
2023-11-22 14:13             ` Adhemerval Zanella Netto
2023-11-06 20:25 ` [PATCH v3 12/19] elf: Ignore LD_PROFILE for setuid binaries Adhemerval Zanella
2023-11-20 22:47   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 13/19] elf: Remove LD_PROFILE for static binaries Adhemerval Zanella
2023-11-20 22:55   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 14/19] elf: Ignore loader debug env vars for setuid Adhemerval Zanella
2023-11-20 22:57   ` Siddhesh Poyarekar [this message]
2023-11-21 18:24     ` Adhemerval Zanella Netto
2023-11-06 20:25 ` [PATCH v3 15/19] elf: Remove any_debug from dl_main_state Adhemerval Zanella
2023-11-20 22:58   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 16/19] elf: Ignore LD_LIBRARY_PATH and debug env var for setuid for static Adhemerval Zanella
2023-11-20 22:59   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 17/19] elf: Add comments on how LD_AUDIT and LD_PRELOAD handle __libc_enable_secure Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 18/19] elf: Ignore LD_BIND_NOW and LD_BIND_NOT for setuid binaries Adhemerval Zanella
2023-11-20 23:02   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 19/19] elf: Refactor process_envvars Adhemerval Zanella
2023-11-20 23:09   ` Siddhesh Poyarekar
2023-11-21 19:00     ` Adhemerval Zanella Netto
2023-11-20 23:12 ` [PATCH v3 00/19] Improve loader environment variable handling Siddhesh Poyarekar
2023-11-21 19:37   ` Adhemerval Zanella Netto

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