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tunables: Disallow negative values for some tunables

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The glibc.malloc.mmap_max tunable as well as al of the INT_32 tunables
don't have use for negative values, so pin the hardcoded limits in the
non-negative range of INT.  There's no real benefit in any of those
use cases for the extended range of unsigned, so I have avoided added
a new type to keep things simple.
This commit is contained in:
Siddhesh Poyarekar 2021-02-05 14:09:24 +05:30
parent a1b8b06a55
commit 228f30ab47
2 changed files with 7 additions and 1 deletions
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6
elf/dl-tunables.list
View File

@ -64,6 +64,7 @@ glibc {
type: INT_32 type: INT_32
env_alias: MALLOC_MMAP_MAX_ env_alias: MALLOC_MMAP_MAX_
security_level: SXID_IGNORE security_level: SXID_IGNORE
minval: 0
} }
arena_max { arena_max {
type: SIZE_T type: SIZE_T
@ -109,22 +110,27 @@ glibc {
skip_lock_busy { skip_lock_busy {
type: INT_32 type: INT_32
default: 3 default: 3
minval: 0
} }
skip_lock_internal_abort { skip_lock_internal_abort {
type: INT_32 type: INT_32
default: 3 default: 3
minval: 0
} }
skip_lock_after_retries { skip_lock_after_retries {
type: INT_32 type: INT_32
default: 3 default: 3
minval: 0
} }
tries { tries {
type: INT_32 type: INT_32
default: 3 default: 3
minval: 0
} }
skip_trylock_internal_abort { skip_trylock_internal_abort {
type: INT_32 type: INT_32
default: 3 default: 3
minval: 0
} }
} }

2
elf/tst-rtld-list-tunables.exp
View File

@ -1,7 +1,7 @@
glibc.malloc.arena_max: 0x0 (min: 0x1, max: 0x[f]+) glibc.malloc.arena_max: 0x0 (min: 0x1, max: 0x[f]+)
glibc.malloc.arena_test: 0x0 (min: 0x1, max: 0x[f]+) glibc.malloc.arena_test: 0x0 (min: 0x1, max: 0x[f]+)
glibc.malloc.check: 0 (min: 0, max: 3) glibc.malloc.check: 0 (min: 0, max: 3)
glibc.malloc.mmap_max: 0 (min: -2147483648, max: 2147483647) glibc.malloc.mmap_max: 0 (min: 0, max: 2147483647)
glibc.malloc.mmap_threshold: 0x0 (min: 0x0, max: 0x[f]+) glibc.malloc.mmap_threshold: 0x0 (min: 0x0, max: 0x[f]+)
glibc.malloc.mxfast: 0x0 (min: 0x0, max: 0x[f]+) glibc.malloc.mxfast: 0x0 (min: 0x0, max: 0x[f]+)
glibc.malloc.perturb: 0 (min: 0, max: 255) glibc.malloc.perturb: 0 (min: 0, max: 255)