>From f3be7d8337ae3def8f2d3d4e089016fcd9686467 Mon Sep 17 00:00:00 2001 From: Riku Voipio Date: Tue, 20 Jan 2009 17:46:18 +0200 Subject: [PATCH] linux-user: identify running binary in /proc/self/exe Some applications like to test /proc/self/exe to find out who they are. Fake the result of readlink() for them. Use realpath() to return full path to binary (which the links /proc/self/exe are) Signed-off-by: Riku Voipio --- linux-user/main.c | 3 +++ linux-user/qemu.h | 1 + linux-user/syscall.c | 12 ++++++++++-- 3 files changed, 14 insertions(+), 2 deletions(-) diff --git a/linux-user/main.c b/linux-user/main.c index 59da5fd..b45dcfe 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -34,6 +34,8 @@ #define DEBUG_LOGFILE "/tmp/qemu.log" +char *exec_path; + static const char *interp_prefix = CONFIG_QEMU_PREFIX; const char *qemu_uname_release = CONFIG_UNAME_RELEASE; @@ -2312,6 +2314,7 @@ int main(int argc, char **argv, char **envp) if (optind >= argc) usage(); filename = argv[optind]; + exec_path = argv[optind]; /* Zero out regs */ memset(regs, 0, sizeof(struct target_pt_regs)); diff --git a/linux-user/qemu.h b/linux-user/qemu.h index 9fddd05..4137567 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -120,6 +120,7 @@ typedef struct TaskState { uint8_t stack[0]; } __attribute__((aligned(16))) TaskState; +extern char *exec_path; void init_task_state(TaskState *ts); extern const char *qemu_uname_release; diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 5d787bb..21ec17b 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -4375,8 +4375,16 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, p2 = lock_user(VERIFY_WRITE, arg2, arg3, 0); if (!p || !p2) ret = -TARGET_EFAULT; - else - ret = get_errno(readlink(path(p), p2, arg3)); + else { + if (strncmp((const char *)p, "/proc/self/exe", 14) == 0) { + char real[PATH_MAX]; + ret = get_errno(realpath(exec_path,real)); + snprintf((char *)p2, arg3, "%s", real); + } + else + ret = get_errno(readlink(path(p), p2, arg3)); + break; + } unlock_user(p2, arg2, ret); unlock_user(p, arg1, 0); } -- 1.5.6.3