I should add one more but on information: the pwrite64_testcase.c
includes three statements for executing the pwrite64 syscall
#if 0
nr = pwrite(fd, content, sizeof(content), 10);
nr = syscall(SYS_pwrite64, fd, content, sizeof(content), 10, 0);
#endif
__asm__ __volatile__("int $0x80"
: "=a"(nr)
: "0"(SYS_pwrite64), "b"(fd), "c"(content),
"d"(sizeof(content)), "S"(10), "D"(0));
The same result is seen with all three calls. The first two should end
up using the |systenter| entry point in the VDSO. The third uses the
old-fashioned entry point. So the bug manifests across both the
systenter/int entry points.
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https://bugs.launchpad.net/bugs/1206746
Title:
ptrace shows esi mutation across pread64 and pwrite64 syscalls
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