Hello, development team of uclibc-ng,
We are a company from China called Ingenic, and we have recently observed
that msgctl(), shmctl() and semctl() do not fully support time64 in the latest
version of uclibc-ng.
When time64 is enabled on mips, timestamps of semaphore obtained by msgclt,
shmctl and semctl are incorrectly, and semctl will report segmentation fault if
RMID operation is used. The timestamp of the semaphore on arm platform is also
wrong.
These errors seem to be caused by incomplete support for time64. Although
struct semid_ds is modified for time64, the positions of its members are
inconsistent with those of struct semid64_ds in the kernel, resulting in
incorrect semaphore timestamps obtained by semctl. In addition, struct shmid_ds
and struct msqid_ds do not seem to support time64. Besides, when semctl
removes the semaphore using RMID, the union semun arg is NULL and does not
point to the semaphore instance. Accessing members of struct semid_ds will
result in a segmentation fault.
The attachment is my modification for three functions and structs they
required on the mips platform, which can be used as a reference. If you think
these three functions do not need to be modified, hope you can write to tell me
the reason.
Looking forward to your reply !
Best regards,
Liu Yu
0001-time64-fixed-msgctl-semctl-shmctl-result-errors-for-.patch
Description: Binary data
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