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linux: Support ProcessInfo::Is64Bit() for ARM on pre-3.5.0 Linux

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The PTRACE_GETREGSET ptrace() request is not supported on ARM before
Linux 3.5.0. This request was only used to determine the bitness of the
target process. Since 64-bit ARM is only supported as of Linux 3.7.0,
when this request is not supported on 32-bit ARM, 64-bit is also not
supported, and the target process must be a 32-bit process.

Bug: crashpad:30
Test: crashpad_util_test ProcessInfo.*
Change-Id: Ib004d24858f146df898dfa6796926d97e2510541
Reviewed-on: https://chromium-review.googlesource.com/455398
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
This commit is contained in:
Mark Mentovai 2017-03-15 13:12:35 -04:00
parent d7467ba7e4
commit 5938c6e993
1 changed files with 25 additions and 4 deletions
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23
util/posix/process_info_linux.cc
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@ -16,6 +16,7 @@
#include <ctype.h>
#include <elf.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/ptrace.h>
@ -358,12 +359,32 @@ bool ProcessInfo::Is64Bit(bool* is_64_bit) const {
pid_,
reinterpret_cast<void*>(NT_PRSTATUS),
&iov) != 0) {
switch (errno) {
#if defined(ARCH_CPU_ARMEL)
case EIO:
// PTRACE_GETREGSET, introduced in Linux 2.6.34 (2225a122ae26),
// requires kernel support enabled by HAVE_ARCH_TRACEHOOK. This has
// been set for x86 (including x86_64) since Linux 2.6.28
// (99bbc4b1e677a), but for ARM only since Linux 3.5.0
// (0693bf68148c4). Fortunately, 64-bit ARM support only appeared in
// Linux 3.7.0, so if PTRACE_GETREGSET fails on ARM with EIO,
// indicating that the request is not supported, the kernel must be
// old enough that 64-bit ARM isn’t supported either.
//
// TODO(mark): Once helpers to interpret the kernel version are
// available, add a DCHECK to ensure that the kernel is older than
// 3.5.
is_64_bit_ = false;
break;
#endif
default:
PLOG(ERROR) << "ptrace";
return false;
}
} else {
is_64_bit_ = am_64_bit == (iov.iov_len == sizeof(regbuf.regs));
}
}
is_64_bit_initialized_.set_valid();
}