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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2022-10-06 12:00:39 +0100 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2022-10-27 14:46:55 +0100 |
| commit | f0f77b883f9e74e6843081af280aa291a9182601 (patch) | |
| tree | 9a009dfbd93ab6dc787f38bc634bc0ede1613d98 | |
| parent | b488de1ab2c613641c198f82c840b88a4d299fb4 (diff) | |
| download | glibc-f0f77b883f9e74e6843081af280aa291a9182601.tar.gz glibc-f0f77b883f9e74e6843081af280aa291a9182601.tar.xz glibc-f0f77b883f9e74e6843081af280aa291a9182601.zip | |
cheri: malloc: add tunable to turn narrowing off
| -rw-r--r-- | elf/dl-tunables.list | 7 | ||||
| -rw-r--r-- | malloc/arena.c | 6 | ||||
| -rw-r--r-- | manual/tunables.texi | 6 |
3 files changed, 19 insertions, 0 deletions
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 |