[LTP] [PATCH 0/2] Change return type of tst_syscall

[LTP] [PATCH 0/2] Change return type of tst_syscall

[Teo Couprie Diaz]

Hello LTP maintainers,

The goal of this patch is to fix a mismatch between the return type used in `tst_syscall`, `int`, and the one used by some syscalls, `long` or `void *` for example, which can be larger than an int and lead to an incorrect test.

As Cyril Hrubis' feedback on the RFC I sent earlier was mostly positive, I am now sending it as a patch proper. Thanks again for having a look !

The main change since the RFC is that the test suite I used for testing the change, specific to test that use tst_syscall, is now in a spearate commit which is not to be merged.
The point is to provide a reference to what was tested and what could be impacted.


CI build on latest master:
https://github.com/Teo-CD/ltp/actions/runs/3386567424

RFC patch on the mailing list archive:
https://lore.kernel.org/ltp/20221027163654.414017-1-teo.coupriediaz@arm.com/T/#m43e6a128019d94a215de33433f09e06f7734c9a2

Thank you in advance,
Téo Couprie Diaz

--
Teo Couprie Diaz (2):
  regen.sh: Use intptr_t for tst_syscall return
  [DO NOT MERGE] tst_syscall test suite

 include/lapi/syscalls/regen.sh |   2 +-
 runtest/check_tst_syscall      | 190 +++++++++++++++++++++++++++++++++
 2 files changed, 191 insertions(+), 1 deletion(-)
 create mode 100644 runtest/check_tst_syscall


base-commit: b606a7c7dc613b8041f7b3958695f2cdde04fbe5
-- 
2.25.1


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[LTP] [PATCH 1/2] regen.sh: Use intptr_t for tst_syscall return

[Teo Couprie Diaz]

Some syscalls directly return pointers, like brk or mmap. int is currently
used for the return value in tst_syscall but is not large enough
to guarantee that such a returned value will fit.
Instead, use intptr_t which is guaranted to be castable to (void *)
without loss of data.

Signed-off-by: Teo Couprie Diaz <teo.coupriediaz@arm.com>
---
 include/lapi/syscalls/regen.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/lapi/syscalls/regen.sh b/include/lapi/syscalls/regen.sh
index 3bf38fd03..97027e2f3 100755
--- a/include/lapi/syscalls/regen.sh
+++ b/include/lapi/syscalls/regen.sh
@@ -48,7 +48,7 @@ cat << EOF > "${output_pid}"
 #endif
 
 #define tst_syscall(NR, ...) ({ \\
-	int tst_ret; \\
+	intptr_t tst_ret; \\
 	if (NR == __LTP__NR_INVALID_SYSCALL) { \\
 		errno = ENOSYS; \\
 		tst_ret = -1; \\
-- 
2.25.1


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Re: [LTP] [PATCH 1/2] regen.sh: Use intptr_t for tst_syscall return

[Cyril Hrubis]

Hi!
Reviwed-by: Cyril Hrubis <chrubis@suse.cz>

-- 
Cyril Hrubis
chrubis@suse.cz

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Re: [LTP] [PATCH 1/2] regen.sh: Use intptr_t for tst_syscall return

[Richard Palethorpe]

Hello,

Merged! thanks.

Cyril Hrubis <chrubis@suse.cz> writes:

> Hi!
> Reviwed-by: Cyril Hrubis <chrubis@suse.cz>
>
> -- 
> Cyril Hrubis
> chrubis@suse.cz


-- 
Thank you,
Richard.

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[LTP] [PATCH 2/2] [DO NOT MERGE] tst_syscall test suite

[Teo Couprie Diaz]

This test suite was generated by grepping for uses of `tst_syscall`
and processing the file names, with a view to verify that the behavior
of those tests wouldn't change by changing the return type.

This is not intended to be merged, rather it is shared to make testing
the patch easier as well as a reference for what testing was done before
submitting the patch.

Signed-off-by: Teo Couprie Diaz <teo.coupriediaz@arm.com>
---
 runtest/check_tst_syscall | 190 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 190 insertions(+)
 create mode 100644 runtest/check_tst_syscall

diff --git a/runtest/check_tst_syscall b/runtest/check_tst_syscall
new file mode 100644
index 000000000..7a6003593
--- /dev/null
+++ b/runtest/check_tst_syscall
@@ -0,0 +1,190 @@
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-- 
2.25.1


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