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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2024-07-08 16:38:10 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2024-07-31 17:02:05 -0300
commit52ddeb99b2db8247a7095ae1354acb3ca3e4ea4a (patch)
tree483786f0c7d72de96b718a3902e493ec26eb2dfe /nss/valid_list_field.c
parent8d2a331b64c8d299d11826058c43d29643cf6b86 (diff)
downloadglibc-azanella/mseal.tar.gz
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elf: Add support for GNU_PROPERTY_NO_MEMORY_SEAL azanella/mseal
The GNU_PROPERTY_NO_MEMORY_SEAL is a GNU property per module instructing
the glibc not to seal the object PT_LOAD.  It can be used for any reason
the modules require to seal not to be enabled (i.e., on Firefox hack to
bypass the dynamic loader and enable DT_RELR on older glibc [1]).  In
this case, it is up to the module to apply memory sealing itself.

The sealing is applied by default, and it is always enforced with
glibc.rtld.seal=2.

Checked on aarch64-linux-gnu, x86_64-linux-gnu, and
powerpc64le-linux-gnu.

[1] https://glandium.org/blog/?p=4297
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