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From: Szabolcs Nagy <nsz@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/arm/morello/main] cheri: malloc: add tunable to turn narrowing off Date: Wed, 23 Nov 2022 14:50:32 +0000 (GMT) [thread overview] Message-ID: <20221123145032.B25DB3852C59@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=de51f7328e62d59f20d7286899a99b35f746dfda commit de51f7328e62d59f20d7286899a99b35f746dfda Author: Szabolcs Nagy <szabolcs.nagy@arm.com> Date: Thu Oct 6 12:00:39 2022 +0100 cheri: malloc: add tunable to turn narrowing off Diff: --- elf/dl-tunables.list | 7 +++++++ malloc/arena.c | 6 ++++++ manual/tunables.texi | 6 ++++++ 3 files changed, 19 insertions(+) diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list index e6a56b3070..83f47dcd9a 100644 --- a/elf/dl-tunables.list +++ b/elf/dl-tunables.list @@ -159,6 +159,13 @@ glibc { maxval: 255 security_level: SXID_IGNORE } + cap_narrowing { + type: INT_32 + minval: 0 + maxval: 1 + default: 1 + security_level: SXID_IGNORE + } } rtld { diff --git a/malloc/arena.c b/malloc/arena.c index 894f49b911..85cc2ad066 100644 --- a/malloc/arena.c +++ b/malloc/arena.c @@ -326,6 +326,12 @@ ptmalloc_init (void) tcache_key_initialize (); #endif +#ifdef __CHERI_PURE_CAPABILITY__ + if (TUNABLE_GET_FULL (glibc, mem, cap_narrowing, int32_t, NULL) == 0) + cap_narrowing_enabled = false; + else + cap_narrowing_enabled = true; +#endif cap_init (); #ifdef USE_MTAG diff --git a/manual/tunables.texi b/manual/tunables.texi index 83cdcdac6d..ffe0202627 100644 --- a/manual/tunables.texi +++ b/manual/tunables.texi @@ -612,3 +612,9 @@ support in the kernel if this tunable has any non-zero value. The default value is @samp{0}, which disables all memory tagging. @end deftp + +@deftp Tunable glibc.mem.cap_narrowing +On CHERI architecture use capability bounds narrowing in the malloc +implementation. By default it is set to 1, to disable bounds narrowing +set it to 0. +@end deftp
next reply other threads:[~2022-11-23 14:50 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-23 14:50 Szabolcs Nagy [this message] -- strict thread matches above, loose matches on Subject: below -- 2022-10-27 14:00 Szabolcs Nagy 2022-10-26 15:22 Szabolcs Nagy 2022-10-12 14:18 Szabolcs Nagy
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