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no MAX_ARG_PAGES

Peter Zijlstra linux-arch linux-audit linux-mm linux-parisc lkml 1 version In review

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  1. v1 Latest4 patches 21 repliesIn review

Patches in v1 No applies recorded yet

#Subject and filesSizeRepliesApplied
1/4arch: personality independent stack topinclude/asm-alpha/a.out.h include/asm-arm/a.out.h include/asm-arm26/a.out.h +19 more+28 -10 replies
1/4arch: personality independent stack topinclude/asm-alpha/a.out.h include/asm-arm/a.out.h include/asm-arm26/a.out.h +19 more+28 -10 replies
2/4audit: rework execve auditfs/exec.c include/linux/binfmts.h kernel/auditsc.c +1 more+70 -212 replies
2/4audit: rework execve auditfs/exec.c include/linux/binfmts.h kernel/auditsc.c +1 more+70 -210 replies
3/4mm: move_page_tables{,_up}include/linux/mm.h mm/mremap.c+110 -16 replies
3/4mm: move_page_tables{,_up}include/linux/mm.h mm/mremap.c+110 -10 replies
4/4mm: variable length argument supportarch/ia64/ia32/binfmt_elf32.c arch/um/kernel/trap.c arch/x86_64/ia32/ia32_aout.c +14 more+495 -45813 replies
4/4mm: variable length argument supportarch/ia64/ia32/binfmt_elf32.c arch/um/kernel/trap.c arch/x86_64/ia32/ia32_aout.c +14 more+495 -4580 replies

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Cover letter [PATCH 0/4] no MAX_ARG_PAGES

This patch-set aims at removing the current limit on argv+env space aka. MAX_ARG_PAGES.

The new mm is created before the binfmt code runs, the stack is placed at the highest address supported by that architecture.

The argv+env data is then copied from the old mm into the new mm (which is inactive at that time - this introduces some cache coherency issues).

Then we run the binfmt code, which will compute the final stack address. The existing stack will be moved downwards (or upwards on PA-RISC) to the desired place.

This 'trick' heavily relies on the MMU, so for no-MMU archs we stay with the old approach.

Tested-on: i386, ia64, frv, parisc, ppc64, um, x86_64

Patches against: .22-rc4

Signature · 20 lines
Changes since last time:

 - fixed ia64
     ( va-space constraints )

 - fixed ia64 CONFIG_IA32_SUPPORT
     ( brown paper bags and more va-space constraints)

 - fixed powerpc
     ( address limit on stack extention )

 - removed audit_kill() in favour of audit_panic()

 - nicely spit out the patches

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Read the cover letter in its thread