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dereferences"
Updated: Removed offending TODO comment.
Dereferences with addresses above the 48-bit hardware addressable range
produce "invalid instruction" (instead of "invalid access") hardware
exceptions (there is no hardware address decoding logic for those bits),
and the address provided by this exception is the address of the
instruction (not the faulting address). The kernel maps the "invalid
instruction" to SEGV, but fails to provide the real fault address.
Because of this ASan lies and says that those cases are null
dereferences. This downgrades the severity of a found bug in terms of
security. In the ASan signal handler, we can not provide the real
faulting address, but at least we can try not to lie.
rdar://50366151
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D68676
llvm-svn: 374265
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@374384 91177308-0d34-0410-b5e6-96231b3b80d8
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dereferences"
As it was breaking bots running sanitizer lint check
This reverts r374265 (git b577efe4567f1f6a711ad36e1d17280dd1c4f009)
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@374308 91177308-0d34-0410-b5e6-96231b3b80d8
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Dereferences with addresses above the 48-bit hardware addressable range
produce "invalid instruction" (instead of "invalid access") hardware
exceptions (there is no hardware address decoding logic for those bits),
and the address provided by this exception is the address of the
instruction (not the faulting address). The kernel maps the "invalid
instruction" to SEGV, but fails to provide the real fault address.
Because of this ASan lies and says that those cases are null
dereferences. This downgrades the severity of a found bug in terms of
security. In the ASan signal handler, we can not provide the real
faulting address, but at least we can try not to lie.
rdar://50366151
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D68676
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@374265 91177308-0d34-0410-b5e6-96231b3b80d8
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Use attribute flag `POSIX_SPAWN_CLOEXEC_DEFAULT` in the call to
`posix_spawn`.
If this flag is set, then only file descriptors explicitly described by
the file_actions argument are available in the spawned process; all of
the other file descriptors are automatically closed in the spawned
process.
POSIX_SPAWN_CLOEXEC_DEFAULT is an Apple-specific extension.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@370121 91177308-0d34-0410-b5e6-96231b3b80d8
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Reviewers: yln,vitalybuka
Reviewed By: yln
Differential Revision: https://reviews.llvm.org/D66391
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@369285 91177308-0d34-0410-b5e6-96231b3b80d8
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On Darwin, we currently use forkpty to communicate with the "atos"
symbolizer. There are several problems that fork[pty] has, e.g. that
after fork, interceptors are still active and this sometimes causes
crashes or hangs. This is especially problematic for TSan, which uses
interceptors for OS-provided locks and mutexes, and even Libc functions
use those.
This patch replaces forkpty with posix_spawn on Darwin. Since
posix_spawn doesn't fork (at least on Darwin), the interceptors are not
a problem. Another benefit is that we'll handle post-fork failures (e.g.
sandbox disallows "exec") gracefully now.
Related revisions and previous attempts that were blocked by or had to
be revered due to test failures:
https://reviews.llvm.org/D48451
https://reviews.llvm.org/D40032
Reviewed By: kubamracek
Differential Revision: https://reviews.llvm.org/D65253
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@368947 91177308-0d34-0410-b5e6-96231b3b80d8
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See https://reviews.llvm.org/D58620 for discussion, and for the commands
I ran. In addition I also ran
for f in $(svn diff | diffstat | grep .cc | cut -f 2 -d ' '); do rg $f . ; done
and manually updated (many) references to renamed files found by that.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@367463 91177308-0d34-0410-b5e6-96231b3b80d8
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