oss-sec mailing list archives
Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size
From: pageexec () freemail hu
Date: Tue, 14 Sep 2010 22:28:31 +0200
On 14 Sep 2010 at 11:51, Roland McGrath wrote:
no it doesn't have to, similarly to how it doesn't have to hardcode _SC_PAGESIZE either, AT_PAGESZ tells userland what it needs to know and i think AT_ARGMAX could exist just as well.I was referring to the ways available to userland heretofore. Certainly, the kernel could add new ways and then userland could do different things (with new kernels). auxv in particular is not a mechanism that could fit for this. The actual limit depends on rlimits of the calling process, and rlimits can change during the life of the program.
obviously an AT_ARGMAX computed at execve time would be based on the rlimits as well and if later userland changed the rlimits, it'd be userland's problem, not that of the kernel (or the kernel could refuse a change that would violate its earlier promise).
auxv is only appropriate for things that are known at the time of the exec and won't change thereafter.
you mean stuff like AT_EUID et al.? ;)
Current thread:
- Re: [PATCH] exec argument expansion can inappropriately trigger OOM-killer, (continued)
- Re: [PATCH] exec argument expansion can inappropriately trigger OOM-killer Roland McGrath (Aug 30)
- Re: [PATCH] exec argument expansion can inappropriately trigger OOM-killer Solar Designer (Aug 30)
- Re: [PATCH] exec argument expansion can inappropriately trigger OOM-killer Roland McGrath (Aug 31)
- [PATCH 0/3] execve argument-copying fixes Roland McGrath (Sep 07)
- [PATCH 1/3] setup_arg_pages: diagnose excessive argument size Roland McGrath (Sep 07)
- Message not available
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size KOSAKI Motohiro (Sep 09)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size Roland McGrath (Sep 10)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size KOSAKI Motohiro (Sep 10)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size pageexec (Sep 11)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size Roland McGrath (Sep 14)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size pageexec (Sep 14)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size Roland McGrath (Sep 14)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size pageexec (Sep 14)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size Roland McGrath (Sep 14)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size pageexec (Sep 15)
- Message not available
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size Roland McGrath (Sep 10)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size pageexec (Sep 11)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size Roland McGrath (Sep 14)
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size pageexec (Sep 14)
- Message not available
- Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size Roland McGrath (Sep 10)
- [PATCH 2/3] execve: improve interactivity with large arguments Roland McGrath (Sep 07)